Made diff & note data consistent

This caused many pain points when working with it.
Part of the data was camel cased the other snake case.
Other parts where snake case & then getting converted in components,
this conversion has the potential for leaking memory.

This changes that & makes it consistent with what it returned from the
API, snake case.

24 files changed, 252 insertions, 269 deletions

diff --git a/app/assets/javascripts/diffs/components/app.vue b/app/assets/javascripts/diffs/components/app.vue
index f80e20a4391..b885fa49365 100644
--- a/app/assets/javascripts/diffs/components/app.vue
+++ b/app/assets/javascripts/diffs/components/app.vue
@@ -94,7 +94,7 @@ export default {
       return __('Show latest version');
     },
     canCurrentUserFork() {
-      return this.currentUser.canFork === true && this.currentUser.canCreateMergeRequest;
+      return this.currentUser.can_fork === true && this.currentUser.can_create_merge_request;
     },
     showCompareVersions() {
       return this.mergeRequestDiffs && this.mergeRequestDiff;
diff --git a/app/assets/javascripts/diffs/components/commit_item.vue b/app/assets/javascripts/diffs/components/commit_item.vue
index 23d0bad2ecb..aa72aca1478 100644
--- a/app/assets/javascripts/diffs/components/commit_item.vue
+++ b/app/assets/javascripts/diffs/components/commit_item.vue
@@ -40,15 +40,17 @@ export default {
   },
   computed: {
     authorName() {
-      return (this.commit.author && this.commit.author.name) || this.commit.authorName;
+      return (this.commit.author && this.commit.author.name) || this.commit.author_name;
     },
     authorUrl() {
       return (
-        (this.commit.author && this.commit.author.webUrl) || `mailto:${this.commit.authorEmail}`
+        (this.commit.author && this.commit.author.web_url) || `mailto:${this.commit.author_email}`
       );
     },
     authorAvatar() {
-      return (this.commit.author && this.commit.author.avatarUrl) || this.commit.authorGravatarUrl;
+      return (
+        (this.commit.author && this.commit.author.avatar_url) || this.commit.author_gravatar_url
+      );
     },
   },
 };
@@ -66,18 +68,18 @@ export default {
     <div class="commit-detail flex-list">
       <div class="commit-content qa-commit-content">
         <a
-          :href="commit.commitUrl"
+          :href="commit.commit_url"
           class="commit-row-message item-title"
-          v-html="commit.titleHtml"
+          v-html="commit.title_html"
         ></a>
 
         <span class="commit-row-message d-block d-sm-none">
           &middot;
-          {{ commit.shortId }}
+          {{ commit.short_id }}
         </span>
 
         <button
-          v-if="commit.descriptionHtml"
+          v-if="commit.description_html"
           class="text-expander js-toggle-button"
           type="button"
           :aria-label="__('Toggle commit description')"
@@ -95,29 +97,29 @@ export default {
           ></a>
           {{ s__('CommitWidget|authored') }}
           <time-ago-tooltip
-            :time="commit.authoredDate"
+            :time="commit.authored_date"
           />
         </div>
 
         <pre
-          v-if="commit.descriptionHtml"
+          v-if="commit.description_html"
           class="commit-row-description js-toggle-content append-bottom-8"
-          v-html="commit.descriptionHtml"
+          v-html="commit.description_html"
         ></pre>
       </div>
       <div class="commit-actions flex-row d-none d-sm-flex">
         <div
-          v-if="commit.signatureHtml"
-          v-html="commit.signatureHtml"
+          v-if="commit.signature_html"
+          v-html="commit.signature_html"
         ></div>
         <commit-pipeline-status
-          v-if="commit.pipelineStatusPath"
-          :endpoint="commit.pipelineStatusPath"
+          v-if="commit.pipeline_status_path"
+          :endpoint="commit.pipeline_status_path"
         />
         <div class="commit-sha-group">
           <div
             class="label label-monospace"
-            v-text="commit.shortId"
+            v-text="commit.short_id"
           ></div>
           <clipboard-button
             :text="commit.id"
diff --git a/app/assets/javascripts/diffs/components/compare_versions_dropdown.vue b/app/assets/javascripts/diffs/components/compare_versions_dropdown.vue
index f4b333f3700..112206e4ad6 100644
--- a/app/assets/javascripts/diffs/components/compare_versions_dropdown.vue
+++ b/app/assets/javascripts/diffs/components/compare_versions_dropdown.vue
@@ -56,16 +56,16 @@ export default {
   methods: {
     commitsText(version) {
       return n__(
-        `${version.commitsCount} commit,`,
-        `${version.commitsCount} commits,`,
-        version.commitsCount,
+        `${version.commits_count} commit,`,
+        `${version.commits_count} commits,`,
+        version.commits_count,
       );
     },
     href(version) {
       if (this.showCommitCount) {
-        return version.versionPath;
+        return version.version_path;
       }
-      return version.comparePath;
+      return version.compare_path;
     },
     versionName(version) {
       if (this.isLatest(version)) {
@@ -74,7 +74,7 @@ export default {
       if (this.targetBranch && (this.isBase(version) || !version)) {
         return this.targetBranch.branchName;
       }
-      return `version ${version.versionIndex}`;
+      return `version ${version.version_index}`;
     },
     isActive(version) {
       if (!version) {
@@ -84,11 +84,11 @@ export default {
       if (this.targetBranch) {
         return (
           (this.isBase(version) && !this.startVersion) ||
-          (this.startVersion && this.startVersion.versionIndex === version.versionIndex)
+          (this.startVersion && this.startVersion.version_index === version.version_index)
         );
       }
 
-      return version.versionIndex === this.mergeRequestVersion.versionIndex;
+      return version.version_index === this.mergeRequestVersion.version_index;
     },
     isBase(version) {
       if (!version || !this.targetBranch) {
@@ -98,7 +98,7 @@ export default {
     },
     isLatest(version) {
       return (
-        this.mergeRequestVersion && version.versionIndex === this.targetVersions[0].versionIndex
+        this.mergeRequestVersion && version.version_index === this.targetVersions[0].version_index
       );
     },
   },
@@ -142,7 +142,7 @@ export default {
               </div>
               <div>
                 <small class="commit-sha">
-                  {{ version.truncatedCommitSha }}
+                  {{ version.truncated_commit_sha }}
                 </small>
               </div>
               <div>
@@ -151,8 +151,8 @@ export default {
                     {{ commitsText(version) }}
                   </template>
                   <time-ago
-                    v-if="version.createdAt"
-                    :time="version.createdAt"
+                    v-if="version.created_at"
+                    :time="version.created_at"
                     class="js-timeago js-timeago-render"
                   />
                 </small>
diff --git a/app/assets/javascripts/diffs/components/diff_content.vue b/app/assets/javascripts/diffs/components/diff_content.vue
index 547742a5ff4..5e5fda5fba6 100644
--- a/app/assets/javascripts/diffs/components/diff_content.vue
+++ b/app/assets/javascripts/diffs/components/diff_content.vue
@@ -39,7 +39,7 @@ export default {
       return this.diffFile.viewer.name === 'text';
     },
     diffFileCommentForm() {
-      return this.getCommentFormForDiffFile(this.diffFile.fileHash);
+      return this.getCommentFormForDiffFile(this.diffFile.file_hash);
     },
     showNotesContainer() {
       return this.diffFile.discussions.length || this.diffFileCommentForm;
@@ -73,28 +73,28 @@ export default {
         <inline-diff-view
           v-if="isInlineView"
           :diff-file="diffFile"
-          :diff-lines="diffFile.highlightedDiffLines || []"
+          :diff-lines="diffFile.highlighted_diff_lines || []"
         />
         <parallel-diff-view
           v-if="isParallelView"
           :diff-file="diffFile"
-          :diff-lines="diffFile.parallelDiffLines || []"
+          :diff-lines="diffFile.parallel_diff_lines || []"
         />
       </template>
       <diff-viewer
         v-else
         :diff-mode="diffMode"
-        :new-path="diffFile.newPath"
-        :new-sha="diffFile.diffRefs.headSha"
-        :old-path="diffFile.oldPath"
-        :old-sha="diffFile.diffRefs.baseSha"
-        :file-hash="diffFile.fileHash"
+        :new-path="diffFile.new_path"
+        :new-sha="diffFile.diff_refs.head_sha"
+        :old-path="diffFile.old_path"
+        :old-sha="diffFile.diff_refs.base_sha"
+        :file-hash="diffFile.file_hash"
         :project-path="projectPath"
       >
         <image-diff-overlay
           slot="image-overlay"
           :discussions="diffFile.discussions"
-          :file-hash="diffFile.fileHash"
+          :file-hash="diffFile.file_hash"
           :can-comment="getNoteableData.current_user.can_create_note"
         />
         <div
@@ -115,7 +115,7 @@ export default {
             :save-button-title="__('Comment')"
             class="diff-comment-form new-note discussion-form discussion-form-container"
             @handleFormUpdate="handleSaveNote"
-            @cancelForm="closeDiffFileCommentForm(diffFile.fileHash)"
+            @cancelForm="closeDiffFileCommentForm(diffFile.file_hash)"
           />          
         </div>
       </diff-viewer>
diff --git a/app/assets/javascripts/diffs/components/diff_file.vue b/app/assets/javascripts/diffs/components/diff_file.vue
index 93834e72417..872131a5900 100644
--- a/app/assets/javascripts/diffs/components/diff_file.vue
+++ b/app/assets/javascripts/diffs/components/diff_file.vue
@@ -40,7 +40,7 @@ export default {
       return sprintf(
         __('You can %{linkStart}view the blob%{linkEnd} instead.'),
         {
-          linkStart: `<a href="${_.escape(this.file.viewPath)}">`,
+          linkStart: `<a href="${_.escape(this.file.view_path)}">`,
           linkEnd: '</a>',
         },
         false,
@@ -49,9 +49,9 @@ export default {
     showExpandMessage() {
       return (
         this.isCollapsed ||
-        (!this.file.highlightedDiffLines &&
+        (!this.file.highlighted_diff_lines &&
           !this.isLoadingCollapsedDiff &&
-          !this.file.tooLarge &&
+          !this.file.too_large &&
           this.file.text)
       );
     },
@@ -59,9 +59,11 @@ export default {
       return this.isLoadingCollapsedDiff || (!this.file.renderIt && !this.isCollapsed);
     },
     hasDiffLines() {
-      const { highlightedDiffLines, parallelDiffLines } = this.file;
-
-      return highlightedDiffLines && parallelDiffLines && parallelDiffLines.length > 0;
+      return (
+        this.file.highlighted_diff_lines &&
+        this.file.parallel_diff_lines &&
+        this.file.parallel_diff_lines.length > 0
+      );
     },
   },
   watch: {
@@ -115,9 +117,9 @@ export default {
 
 <template>
   <div
-    :id="file.fileHash"
+    :id="file.file_hash"
     :class="{
-      'is-active': currentDiffFileId === file.fileHash
+      'is-active': currentDiffFileId === file.file_hash
     }"
     class="diff-file file-holder"
   >
@@ -141,7 +143,7 @@ export default {
         make your changes there, and submit a merge request.
       </span>
       <a
-        :href="file.forkPath"
+        :href="file.fork_path"
         class="js-fork-suggestion-button btn btn-grouped btn-inverted btn-success"
       >
         Fork
@@ -157,7 +159,7 @@ export default {
 
     <diff-content
       v-if="!isCollapsed && file.renderIt"
-      :class="{ hidden: isCollapsed || file.tooLarge }"
+      :class="{ hidden: isCollapsed || file.too_large }"
       :diff-file="file"
     />
     <gl-loading-icon
@@ -178,7 +180,7 @@ export default {
       </a>
     </div>
     <div
-      v-if="file.tooLarge"
+      v-if="file.too_large"
       class="nothing-here-block diff-collapsed js-too-large-diff"
     >
       {{ __('This source diff could not be displayed because it is too large.') }}
diff --git a/app/assets/javascripts/diffs/components/diff_file_header.vue b/app/assets/javascripts/diffs/components/diff_file_header.vue
index dcf1057eb84..af03cec6582 100644
--- a/app/assets/javascripts/diffs/components/diff_file_header.vue
+++ b/app/assets/javascripts/diffs/components/diff_file_header.vue
@@ -68,32 +68,32 @@ export default {
     },
     titleLink() {
       if (this.diffFile.submodule) {
-        return this.diffFile.submoduleTreeUrl || this.diffFile.submoduleLink;
+        return this.diffFile.submodule_tree_url || this.diffFile.submodule_link;
       }
       return this.discussionPath;
     },
     filePath() {
       if (this.diffFile.submodule) {
-        return `${this.diffFile.filePath} @ ${truncateSha(this.diffFile.blob.id)}`;
+        return `${this.diffFile.file_path} @ ${truncateSha(this.diffFile.blob.id)}`;
       }
 
-      if (this.diffFile.deletedFile) {
-        return sprintf(__('%{filePath} deleted'), { filePath: this.diffFile.filePath }, false);
+      if (this.diffFile.deleted_file) {
+        return sprintf(__('%{filePath} deleted'), { filePath: this.diffFile.file_path }, false);
       }
 
-      return this.diffFile.filePath;
+      return this.diffFile.file_path;
     },
     titleTag() {
-      return this.diffFile.fileHash ? 'a' : 'span';
+      return this.diffFile.file_hash ? 'a' : 'span';
     },
     isUsingLfs() {
-      return this.diffFile.storedExternally && this.diffFile.externalStorage === 'lfs';
+      return this.diffFile.stored_externally && this.diffFile.external_storage === 'lfs';
     },
     collapseIcon() {
       return this.expanded ? 'chevron-down' : 'chevron-right';
     },
     viewFileButtonText() {
-      const truncatedContentSha = _.escape(truncateSha(this.diffFile.contentSha));
+      const truncatedContentSha = _.escape(truncateSha(this.diffFile.content_sha));
       return sprintf(
         s__('MergeRequests|View file @ %{commitId}'),
         {
@@ -103,7 +103,7 @@ export default {
       );
     },
     viewReplacedFileButtonText() {
-      const truncatedBaseSha = _.escape(truncateSha(this.diffFile.diffRefs.baseSha));
+      const truncatedBaseSha = _.escape(truncateSha(this.diffFile.diff_refs.base_sha));
       return sprintf(
         s__('MergeRequests|View replaced file @ %{commitId}'),
         {
@@ -113,7 +113,7 @@ export default {
       );
     },
     gfmCopyText() {
-      return `\`${this.diffFile.filePath}\``;
+      return `\`${this.diffFile.file_path}\``;
     },
   },
   methods: {
@@ -164,21 +164,21 @@ export default {
           aria-hidden="true"
           css-classes="js-file-icon append-right-5"
         />
-        <span v-if="diffFile.renamedFile">
+        <span v-if="diffFile.renamed_file">
           <strong
             v-tooltip
-            :title="diffFile.oldPath"
+            :title="diffFile.old_path"
             class="file-title-name"
             data-container="body"
-            v-html="diffFile.oldPathHtml"
+            v-html="diffFile.old_path_html"
           ></strong>
           →
           <strong
             v-tooltip
-            :title="diffFile.newPath"
+            :title="diffFile.new_path"
             class="file-title-name"
             data-container="body"
-            v-html="diffFile.newPathHtml"
+            v-html="diffFile.new_path_html"
           ></strong>
         </span>
 
@@ -195,16 +195,16 @@ export default {
 
       <clipboard-button
         :title="__('Copy file path to clipboard')"
-        :text="diffFile.filePath"
+        :text="diffFile.file_path"
         :gfm="gfmCopyText"
         css-class="btn-default btn-transparent btn-clipboard"
       />
 
       <small
-        v-if="diffFile.modeChanged"
+        v-if="diffFile.mode_changed"
         ref="fileMode"
       >
-        {{ diffFile.aMode }} → {{ diffFile.bMode }}
+        {{ diffFile.a_mode }} → {{ diffFile.b_mode }}
       </small>
 
       <span
@@ -220,7 +220,7 @@ export default {
       class="file-actions d-none d-sm-block"
     >
       <template
-        v-if="diffFile.blob && diffFile.blob.readableText"
+        v-if="diffFile.blob && diffFile.blob.readable_text"
       >
         <button
           :disabled="!diffHasDiscussions(diffFile)"
@@ -234,33 +234,33 @@ export default {
         </button>
 
         <edit-button
-          v-if="!diffFile.deletedFile"
+          v-if="!diffFile.deleted_file"
           :can-current-user-fork="canCurrentUserFork"
-          :edit-path="diffFile.editPath"
-          :can-modify-blob="diffFile.canModifyBlob"
+          :edit-path="diffFile.edit_path"
+          :can-modify-blob="diffFile.can_modify_blob"
           @showForkMessage="showForkMessage"
         />
       </template>
 
       <a
-        v-if="diffFile.replacedViewPath"
-        :href="diffFile.replacedViewPath"
+        v-if="diffFile.replaced_view_path"
+        :href="diffFile.replaced_view_path"
         class="btn view-file js-view-file"
         v-html="viewReplacedFileButtonText"
       >
       </a>
       <a
-        :href="diffFile.viewPath"
+        :href="diffFile.view_path"
         class="btn view-file js-view-file"
         v-html="viewFileButtonText"
       >
       </a>
 
       <a
-        v-if="diffFile.externalUrl"
+        v-if="diffFile.external_url"
         v-tooltip
-        :href="diffFile.externalUrl"
-        :title="`View on ${diffFile.formattedExternalUrl}`"
+        :href="diffFile.external_url"
+        :title="`View on ${diffFile.formatted_external_url}`"
         target="_blank"
         rel="noopener noreferrer"
         class="btn btn-file-option"
diff --git a/app/assets/javascripts/diffs/components/diff_line_gutter_content.vue b/app/assets/javascripts/diffs/components/diff_line_gutter_content.vue
index f4a9be19496..8f037eeefc4 100644
--- a/app/assets/javascripts/diffs/components/diff_line_gutter_content.vue
+++ b/app/assets/javascripts/diffs/components/diff_line_gutter_content.vue
@@ -73,7 +73,7 @@ export default {
     }),
     ...mapGetters(['isLoggedIn']),
     lineHref() {
-      return `#${this.line.lineCode || ''}`;
+      return `#${this.line.line_code || ''}`;
     },
     shouldShowCommentButton() {
       return (
@@ -99,7 +99,7 @@ export default {
   methods: {
     ...mapActions('diffs', ['loadMoreLines', 'showCommentForm']),
     handleCommentButton() {
-      this.showCommentForm({ lineCode: this.line.lineCode });
+      this.showCommentForm({ lineCode: this.line.line_code });
     },
     handleLoadMoreLines() {
       if (this.isRequesting) {
@@ -108,8 +108,8 @@ export default {
 
       this.isRequesting = true;
       const endpoint = this.contextLinesPath;
-      const oldLineNumber = this.line.metaData.oldPos || 0;
-      const newLineNumber = this.line.metaData.newPos || 0;
+      const oldLineNumber = this.line.meta_data.old_pos || 0;
+      const newLineNumber = this.line.meta_data.new_pos || 0;
       const offset = newLineNumber - oldLineNumber;
       const bottom = this.isBottom;
       const { fileHash } = this;
@@ -125,12 +125,12 @@ export default {
         to = lineNumber + UNFOLD_COUNT;
       } else {
         const diffFile = utils.findDiffFile(this.diffFiles, this.fileHash);
-        const indexForInline = utils.findIndexInInlineLines(diffFile.highlightedDiffLines, {
+        const indexForInline = utils.findIndexInInlineLines(diffFile.highlighted_diff_lines, {
           oldLineNumber,
           newLineNumber,
         });
-        const prevLine = diffFile.highlightedDiffLines[indexForInline - 2];
-        const prevLineNumber = (prevLine && prevLine.newLine) || 0;
+        const prevLine = diffFile.highlighted_diff_lines[indexForInline - 2];
+        const prevLineNumber = (prevLine && prevLine.new_line) || 0;
 
         if (since <= prevLineNumber + 1) {
           since = prevLineNumber + 1;
diff --git a/app/assets/javascripts/diffs/components/diff_line_note_form.vue b/app/assets/javascripts/diffs/components/diff_line_note_form.vue
index bb9bb821de3..07f38172575 100644
--- a/app/assets/javascripts/diffs/components/diff_line_note_form.vue
+++ b/app/assets/javascripts/diffs/components/diff_line_note_form.vue
@@ -53,7 +53,7 @@ export default {
         this.noteableData.diff_head_sha,
         DIFF_NOTE_TYPE,
         this.noteableData.source_project_id,
-        this.line.lineCode,
+        this.line.line_code,
       ];
 
       this.initAutoSave(this.noteableData, keys);
@@ -72,7 +72,7 @@ export default {
       }
 
       this.cancelCommentForm({
-        lineCode: this.line.lineCode,
+        lineCode: this.line.line_code,
       });
       this.$nextTick(() => {
         this.resetAutoSave();
@@ -94,7 +94,7 @@ export default {
     <note-form
       ref="noteForm"
       :is-editing="true"
-      :line-code="line.lineCode"
+      :line-code="line.line_code"
       save-button-title="Comment"
       class="diff-comment-form"
       @cancelForm="handleCancelCommentForm"
diff --git a/app/assets/javascripts/diffs/components/diff_table_cell.vue b/app/assets/javascripts/diffs/components/diff_table_cell.vue
index 5d9a0b123fe..0a893a57f07 100644
--- a/app/assets/javascripts/diffs/components/diff_table_cell.vue
+++ b/app/assets/javascripts/diffs/components/diff_table_cell.vue
@@ -96,9 +96,7 @@ export default {
       };
     },
     lineNumber() {
-      const { lineType } = this;
-
-      return lineType === OLD_LINE_TYPE ? this.line.oldLine : this.line.newLine;
+      return this.lineType === OLD_LINE_TYPE ? this.line.old_line : this.line.new_line;
     },
   },
 };
diff --git a/app/assets/javascripts/diffs/components/inline_diff_comment_row.vue b/app/assets/javascripts/diffs/components/inline_diff_comment_row.vue
index 46a51859da5..b9e14c53d2c 100644
--- a/app/assets/javascripts/diffs/components/inline_diff_comment_row.vue
+++ b/app/assets/javascripts/diffs/components/inline_diff_comment_row.vue
@@ -48,7 +48,7 @@ export default {
           :discussions="line.discussions"
         />
         <diff-line-note-form
-          v-if="diffLineCommentForms[line.lineCode]"
+          v-if="diffLineCommentForms[line.line_code]"
           :diff-file-hash="diffFileHash"
           :line="line"
           :note-target-line="line"
diff --git a/app/assets/javascripts/diffs/components/inline_diff_table_row.vue b/app/assets/javascripts/diffs/components/inline_diff_table_row.vue
index 542acd3d930..1f4088066d1 100644
--- a/app/assets/javascripts/diffs/components/inline_diff_table_row.vue
+++ b/app/assets/javascripts/diffs/components/inline_diff_table_row.vue
@@ -52,9 +52,7 @@ export default {
       };
     },
     inlineRowId() {
-      const { lineCode, oldLine, newLine } = this.line;
-
-      return lineCode || `${this.fileHash}_${oldLine}_${newLine}`;
+      return this.line.line_code || `${this.fileHash}_${this.line.old_line}_${this.line.new_line}`;
     },
   },
   created() {
@@ -107,7 +105,7 @@ export default {
     <td
       :class="line.type"
       class="line_content"
-      v-html="line.richText"
+      v-html="line.rich_text"
     >
     </td>
   </tr>
diff --git a/app/assets/javascripts/diffs/components/inline_diff_view.vue b/app/assets/javascripts/diffs/components/inline_diff_view.vue
index fbf9e77ac07..79efac89e98 100644
--- a/app/assets/javascripts/diffs/components/inline_diff_view.vue
+++ b/app/assets/javascripts/diffs/components/inline_diff_view.vue
@@ -43,16 +43,16 @@ export default {
         v-for="(line, index) in diffLines"
       >
         <inline-diff-table-row
-          :key="line.lineCode"
-          :file-hash="diffFile.fileHash"
-          :context-lines-path="diffFile.contextLinesPath"
+          :key="line.line_code"
+          :file-hash="diffFile.file_hash"
+          :context-lines-path="diffFile.context_lines_path"
           :line="line"
           :is-bottom="index + 1 === diffLinesLength"
         />
         <inline-diff-comment-row
           v-if="shouldRenderInlineCommentRow(line)"
           :key="index"
-          :diff-file-hash="diffFile.fileHash"
+          :diff-file-hash="diffFile.file_hash"
           :line="line"
           :line-index="index"
         />
diff --git a/app/assets/javascripts/diffs/components/parallel_diff_comment_row.vue b/app/assets/javascripts/diffs/components/parallel_diff_comment_row.vue
index 3b71c0a1fd4..00c2df4dac1 100644
--- a/app/assets/javascripts/diffs/components/parallel_diff_comment_row.vue
+++ b/app/assets/javascripts/diffs/components/parallel_diff_comment_row.vue
@@ -27,10 +27,10 @@ export default {
       diffLineCommentForms: state => state.diffs.diffLineCommentForms,
     }),
     leftLineCode() {
-      return this.line.left && this.line.left.lineCode;
+      return this.line.left && this.line.left.line_code;
     },
     rightLineCode() {
-      return this.line.right && this.line.right.lineCode;
+      return this.line.right && this.line.right.line_code;
     },
     hasExpandedDiscussionOnLeft() {
       return this.line.left && this.line.left.discussions
diff --git a/app/assets/javascripts/diffs/components/parallel_diff_table_row.vue b/app/assets/javascripts/diffs/components/parallel_diff_table_row.vue
index fcc3b3e9117..2d87db12fd6 100644
--- a/app/assets/javascripts/diffs/components/parallel_diff_table_row.vue
+++ b/app/assets/javascripts/diffs/components/parallel_diff_table_row.vue
@@ -120,11 +120,11 @@ export default {
         class="diff-line-num old_line"
       />
       <td
-        :id="line.left.lineCode"
+        :id="line.left.line_code"
         :class="parallelViewLeftLineType"
         class="line_content parallel left-side"
         @mousedown.native="handleParallelLineMouseDown"
-        v-html="line.left.richText"
+        v-html="line.left.rich_text"
       >
       </td>
     </template>
@@ -146,11 +146,11 @@ export default {
         class="diff-line-num new_line"
       />
       <td
-        :id="line.right.lineCode"
+        :id="line.right.line_code"
         :class="line.right.type"
         class="line_content parallel right-side"
         @mousedown.native="handleParallelLineMouseDown"
-        v-html="line.right.richText"
+        v-html="line.right.rich_text"
       >
       </td>
     </template>
diff --git a/app/assets/javascripts/diffs/components/parallel_diff_view.vue b/app/assets/javascripts/diffs/components/parallel_diff_view.vue
index 3452f0d2b00..6942f9b53e0 100644
--- a/app/assets/javascripts/diffs/components/parallel_diff_view.vue
+++ b/app/assets/javascripts/diffs/components/parallel_diff_view.vue
@@ -46,8 +46,8 @@ export default {
         >
           <parallel-diff-table-row
             :key="index"
-            :file-hash="diffFile.fileHash"
-            :context-lines-path="diffFile.contextLinesPath"
+            :file-hash="diffFile.file_hash"
+            :context-lines-path="diffFile.context_lines_path"
             :line="line"
             :is-bottom="index + 1 === diffLinesLength"
           />
@@ -55,7 +55,7 @@ export default {
             v-if="shouldRenderParallelCommentRow(line)"
             :key="`dcr-${index}`"
             :line="line"
-            :diff-file-hash="diffFile.fileHash"
+            :diff-file-hash="diffFile.file_hash"
             :line-index="index"
           />
         </template>
diff --git a/app/assets/javascripts/diffs/index.js b/app/assets/javascripts/diffs/index.js
index aae89109c27..06ef4207d85 100644
--- a/app/assets/javascripts/diffs/index.js
+++ b/app/assets/javascripts/diffs/index.js
@@ -1,6 +1,5 @@
 import Vue from 'vue';
 import { mapState } from 'vuex';
-import { convertObjectPropsToCamelCase } from '~/lib/utils/common_utils';
 import diffsApp from './components/app.vue';
 
 export default function initDiffsApp(store) {
@@ -17,9 +16,7 @@ export default function initDiffsApp(store) {
       return {
         endpoint: dataset.endpoint,
         projectPath: dataset.projectPath,
-        currentUser: convertObjectPropsToCamelCase(JSON.parse(dataset.currentUserData), {
-          deep: true,
-        }),
+        currentUser: JSON.parse(dataset.currentUserData) || {},
       };
     },
     computed: {
diff --git a/app/assets/javascripts/diffs/store/actions.js b/app/assets/javascripts/diffs/store/actions.js
index 41256fdd27a..fb648527450 100644
--- a/app/assets/javascripts/diffs/store/actions.js
+++ b/app/assets/javascripts/diffs/store/actions.js
@@ -50,8 +50,8 @@ export const assignDiscussionsToDiff = (
 };
 
 export const removeDiscussionsFromDiff = ({ commit }, removeDiscussion) => {
-  const { fileHash, line_code, id } = removeDiscussion;
-  commit(types.REMOVE_LINE_DISCUSSIONS_FOR_FILE, { fileHash, lineCode: line_code, id });
+  const { file_hash, line_code, id } = removeDiscussion;
+  commit(types.REMOVE_LINE_DISCUSSIONS_FOR_FILE, { fileHash: file_hash, lineCode: line_code, id });
 };
 
 export const startRenderDiffsQueue = ({ state, commit }) => {
@@ -189,7 +189,7 @@ export const saveDiffDiscussion = ({ dispatch }, { note, formData }) => {
   return dispatch('saveNote', postData, { root: true })
     .then(result => dispatch('updateDiscussion', result.discussion, { root: true }))
     .then(discussion => dispatch('assignDiscussionsToDiff', [discussion]))
-    .then(() => dispatch('closeDiffFileCommentForm', formData.diffFile.fileHash))
+    .then(() => dispatch('closeDiffFileCommentForm', formData.diffFile.file_hash))
     .then(() => dispatch('startTaskList', null, { root: true }))
     .catch(() => createFlash(s__('MergeRequests|Saving the comment failed')));
 };
diff --git a/app/assets/javascripts/diffs/store/getters.js b/app/assets/javascripts/diffs/store/getters.js
index bf490f9d78a..7f02c67a64e 100644
--- a/app/assets/javascripts/diffs/store/getters.js
+++ b/app/assets/javascripts/diffs/store/getters.js
@@ -1,4 +1,3 @@
-import _ from 'underscore';
 import { PARALLEL_DIFF_VIEW_TYPE, INLINE_DIFF_VIEW_TYPE } from '../constants';
 
 export const isParallelView = state => state.diffViewType === PARALLEL_DIFF_VIEW_TYPE;
@@ -68,8 +67,7 @@ export const diffHasDiscussions = (state, getters) => diff =>
  */
 export const getDiffFileDiscussions = (state, getters, rootState, rootGetters) => diff =>
   rootGetters.discussions.filter(
-    discussion =>
-      discussion.diff_discussion && _.isEqual(discussion.diff_file.file_hash, diff.fileHash),
+    discussion => discussion.diff_discussion && discussion.diff_file.file_hash === diff.file_hash,
   ) || [];
 
 export const shouldRenderParallelCommentRow = state => line => {
@@ -90,14 +88,14 @@ export const shouldRenderParallelCommentRow = state => line => {
     return true;
   }
 
-  const hasCommentFormOnLeft = line.left && state.diffLineCommentForms[line.left.lineCode];
-  const hasCommentFormOnRight = line.right && state.diffLineCommentForms[line.right.lineCode];
+  const hasCommentFormOnLeft = line.left && state.diffLineCommentForms[line.left.line_code];
+  const hasCommentFormOnRight = line.right && state.diffLineCommentForms[line.right.line_code];
 
   return hasCommentFormOnLeft || hasCommentFormOnRight;
 };
 
 export const shouldRenderInlineCommentRow = state => line => {
-  if (state.diffLineCommentForms[line.lineCode]) return true;
+  if (state.diffLineCommentForms[line.line_code]) return true;
 
   if (!line.discussions || line.discussions.length === 0) {
     return false;
@@ -108,7 +106,7 @@ export const shouldRenderInlineCommentRow = state => line => {
 
 // prevent babel-plugin-rewire from generating an invalid default during karma∂ tests
 export const getDiffFileByHash = state => fileHash =>
-  state.diffFiles.find(file => file.fileHash === fileHash);
+  state.diffFiles.find(file => file.file_hash === fileHash);
 
 export const allBlobs = state => Object.values(state.treeEntries).filter(f => f.type === 'blob');
 
diff --git a/app/assets/javascripts/diffs/store/mutations.js b/app/assets/javascripts/diffs/store/mutations.js
index e651c197968..2133cfe4825 100644
--- a/app/assets/javascripts/diffs/store/mutations.js
+++ b/app/assets/javascripts/diffs/store/mutations.js
@@ -23,12 +23,11 @@ export default {
   },
 
   [types.SET_DIFF_DATA](state, data) {
-    const diffData = convertObjectPropsToCamelCase(data, { deep: true });
-    prepareDiffData(diffData);
-    const { tree, treeEntries } = generateTreeList(diffData.diffFiles);
+    prepareDiffData(data);
+    const { tree, treeEntries } = generateTreeList(data.diff_files);
 
     Object.assign(state, {
-      ...diffData,
+      ...convertObjectPropsToCamelCase(data),
       tree: sortTree(tree),
       treeEntries,
     });
@@ -42,7 +41,7 @@ export default {
 
   [types.SET_MERGE_REQUEST_DIFFS](state, mergeRequestDiffs) {
     Object.assign(state, {
-      mergeRequestDiffs: convertObjectPropsToCamelCase(mergeRequestDiffs, { deep: true }),
+      mergeRequestDiffs,
     });
   },
 
@@ -62,19 +61,18 @@ export default {
     const { lineNumbers, contextLines, fileHash } = options;
     const { bottom } = options.params;
     const diffFile = findDiffFile(state.diffFiles, fileHash);
-    const { highlightedDiffLines, parallelDiffLines } = diffFile;
 
     removeMatchLine(diffFile, lineNumbers, bottom);
 
     const lines = addLineReferences(contextLines, lineNumbers, bottom).map(line => ({
       ...line,
-      lineCode: line.lineCode || `${fileHash}_${line.oldLine}_${line.newLine}`,
+      line_code: line.line_code || `${fileHash}_${line.old_line}_${line.new_line}`,
       discussions: line.discussions || [],
     }));
 
     addContextLines({
-      inlineLines: highlightedDiffLines,
-      parallelLines: parallelDiffLines,
+      inlineLines: diffFile.highlighted_diff_lines,
+      parallelLines: diffFile.parallel_diff_lines,
       contextLines: lines,
       bottom,
       lineNumbers,
@@ -82,10 +80,9 @@ export default {
   },
 
   [types.ADD_COLLAPSED_DIFFS](state, { file, data }) {
-    const normalizedData = convertObjectPropsToCamelCase(data, { deep: true });
-    prepareDiffData(normalizedData);
-    const [newFileData] = normalizedData.diffFiles.filter(f => f.fileHash === file.fileHash);
-    const selectedFile = state.diffFiles.find(f => f.fileHash === file.fileHash);
+    prepareDiffData(data);
+    const [newFileData] = data.diff_files.filter(f => f.file_hash === file.file_hash);
+    const selectedFile = state.diffFiles.find(f => f.file_hash === file.file_hash);
     Object.assign(selectedFile, { ...newFileData });
   },
 
@@ -101,20 +98,20 @@ export default {
 
     const discussionLineCode = discussion.line_code;
     const fileHash = discussion.diff_file.file_hash;
-    const lineCheck = ({ lineCode }) =>
-      lineCode === discussionLineCode &&
+    const lineCheck = line =>
+      line.line_code === discussionLineCode &&
       isDiscussionApplicableToLine({
         discussion,
-        diffPosition: diffPositionByLineCode[lineCode],
+        diffPosition: diffPositionByLineCode[line.line_code],
         latestDiff,
       });
 
     state.diffFiles = state.diffFiles.map(diffFile => {
-      if (diffFile.fileHash === fileHash) {
+      if (diffFile.file_hash === fileHash) {
         const file = { ...diffFile };
 
-        if (file.highlightedDiffLines) {
-          file.highlightedDiffLines = file.highlightedDiffLines.map(line => {
+        if (file.highlighted_diff_lines) {
+          file.highlighted_diff_lines = file.highlighted_diff_lines.map(line => {
             if (lineCheck(line)) {
               return {
                 ...line,
@@ -126,8 +123,8 @@ export default {
           });
         }
 
-        if (file.parallelDiffLines) {
-          file.parallelDiffLines = file.parallelDiffLines.map(line => {
+        if (file.parallel_diff_lines) {
+          file.parallel_diff_lines = file.parallel_diff_lines.map(line => {
             const left = line.left && lineCheck(line.left);
             const right = line.right && lineCheck(line.right);
 
@@ -148,7 +145,7 @@ export default {
           });
         }
 
-        if (!file.parallelDiffLines || !file.highlightedDiffLines) {
+        if (!file.parallel_diff_lines || !file.highlighted_diff_lines) {
           file.discussions = file.discussions.concat(discussion);
         }
 
@@ -160,16 +157,16 @@ export default {
   },
 
   [types.REMOVE_LINE_DISCUSSIONS_FOR_FILE](state, { fileHash, lineCode, id }) {
-    const selectedFile = state.diffFiles.find(f => f.fileHash === fileHash);
+    const selectedFile = state.diffFiles.find(f => f.file_hash === fileHash);
     if (selectedFile) {
-      if (selectedFile.parallelDiffLines) {
-        const targetLine = selectedFile.parallelDiffLines.find(
+      if (selectedFile.parallel_diff_lines) {
+        const targetLine = selectedFile.parallel_diff_lines.find(
           line =>
-            (line.left && line.left.lineCode === lineCode) ||
-            (line.right && line.right.lineCode === lineCode),
+            (line.left && line.left.line_code === lineCode) ||
+            (line.right && line.right.line_code === lineCode),
         );
         if (targetLine) {
-          const side = targetLine.left && targetLine.left.lineCode === lineCode ? 'left' : 'right';
+          const side = targetLine.left && targetLine.left.line_code === lineCode ? 'left' : 'right';
 
           Object.assign(targetLine[side], {
             discussions: [],
@@ -177,9 +174,9 @@ export default {
         }
       }
 
-      if (selectedFile.highlightedDiffLines) {
-        const targetInlineLine = selectedFile.highlightedDiffLines.find(
-          line => line.lineCode === lineCode,
+      if (selectedFile.highlighted_diff_lines) {
+        const targetInlineLine = selectedFile.highlighted_diff_lines.find(
+          line => line.line_code === lineCode,
         );
 
         if (targetInlineLine) {
diff --git a/app/assets/javascripts/diffs/store/utils.js b/app/assets/javascripts/diffs/store/utils.js
index a935b9b1ffa..d9d3c0f2ca2 100644
--- a/app/assets/javascripts/diffs/store/utils.js
+++ b/app/assets/javascripts/diffs/store/utils.js
@@ -1,5 +1,4 @@
 import _ from 'underscore';
-import { convertObjectPropsToCamelCase } from '~/lib/utils/common_utils';
 import { diffModes } from '~/ide/constants';
 import {
   LINE_POSITION_LEFT,
@@ -15,7 +14,7 @@ import {
 } from '../constants';
 
 export function findDiffFile(files, hash) {
-  return files.filter(file => file.fileHash === hash)[0];
+  return files.filter(file => file.file_hash === hash)[0];
 }
 
 export const getReversePosition = linePosition => {
@@ -39,14 +38,14 @@ export function getFormData(params) {
   } = params;
 
   const position = JSON.stringify({
-    base_sha: diffFile.diffRefs.baseSha,
-    start_sha: diffFile.diffRefs.startSha,
-    head_sha: diffFile.diffRefs.headSha,
-    old_path: diffFile.oldPath,
-    new_path: diffFile.newPath,
+    base_sha: diffFile.diff_refs.base_sha,
+    start_sha: diffFile.diff_refs.start_sha,
+    head_sha: diffFile.diff_refs.head_sha,
+    old_path: diffFile.old_path,
+    new_path: diffFile.new_path,
     position_type: positionType || TEXT_DIFF_POSITION_TYPE,
-    old_line: noteTargetLine ? noteTargetLine.oldLine : null,
-    new_line: noteTargetLine ? noteTargetLine.newLine : null,
+    old_line: noteTargetLine ? noteTargetLine.old_line : null,
+    new_line: noteTargetLine ? noteTargetLine.new_line : null,
     x: params.x,
     y: params.y,
     width: params.width,
@@ -56,7 +55,7 @@ export function getFormData(params) {
   const postData = {
     view: diffViewType,
     line_type: linePosition === LINE_POSITION_RIGHT ? NEW_LINE_TYPE : OLD_LINE_TYPE,
-    merge_request_diff_head_sha: diffFile.diffRefs.headSha,
+    merge_request_diff_head_sha: diffFile.diff_refs.head_sha,
     in_reply_to_discussion_id: '',
     note_project_id: '',
     target_type: noteableData.targetType,
@@ -69,10 +68,10 @@ export function getFormData(params) {
       noteable_id: noteableData.id,
       commit_id: '',
       type:
-        diffFile.diffRefs.startSha && diffFile.diffRefs.headSha
+        diffFile.diff_refs.start_sha && diffFile.diff_refs.head_sha
           ? DIFF_NOTE_TYPE
           : LEGACY_DIFF_NOTE_TYPE,
-      line_code: noteTargetLine ? noteTargetLine.lineCode : null,
+      line_code: noteTargetLine ? noteTargetLine.line_code : null,
     },
   };
 
@@ -93,7 +92,7 @@ export const findIndexInInlineLines = (lines, lineNumbers) => {
 
   return _.findIndex(
     lines,
-    line => line.oldLine === oldLineNumber && line.newLine === newLineNumber,
+    line => line.old_line === oldLineNumber && line.new_line === newLineNumber,
   );
 };
 
@@ -105,18 +104,18 @@ export const findIndexInParallelLines = (lines, lineNumbers) => {
     line =>
       line.left &&
       line.right &&
-      line.left.oldLine === oldLineNumber &&
-      line.right.newLine === newLineNumber,
+      line.left.old_line === oldLineNumber &&
+      line.right.new_line === newLineNumber,
   );
 };
 
 export function removeMatchLine(diffFile, lineNumbers, bottom) {
-  const indexForInline = findIndexInInlineLines(diffFile.highlightedDiffLines, lineNumbers);
-  const indexForParallel = findIndexInParallelLines(diffFile.parallelDiffLines, lineNumbers);
+  const indexForInline = findIndexInInlineLines(diffFile.highlighted_diff_lines, lineNumbers);
+  const indexForParallel = findIndexInParallelLines(diffFile.parallel_diff_lines, lineNumbers);
   const factor = bottom ? 1 : -1;
 
-  diffFile.highlightedDiffLines.splice(indexForInline + factor, 1);
-  diffFile.parallelDiffLines.splice(indexForParallel + factor, 1);
+  diffFile.highlighted_diff_lines.splice(indexForInline + factor, 1);
+  diffFile.parallel_diff_lines.splice(indexForParallel + factor, 1);
 }
 
 export function addLineReferences(lines, lineNumbers, bottom) {
@@ -125,18 +124,16 @@ export function addLineReferences(lines, lineNumbers, bottom) {
   let matchLineIndex = -1;
 
   const linesWithNumbers = lines.map((l, index) => {
-    const line = convertObjectPropsToCamelCase(l);
-
-    if (line.type === MATCH_LINE_TYPE) {
+    if (l.type === MATCH_LINE_TYPE) {
       matchLineIndex = index;
     } else {
-      Object.assign(line, {
-        oldLine: bottom ? oldLineNumber + index + 1 : oldLineNumber + index - lineCount,
-        newLine: bottom ? newLineNumber + index + 1 : newLineNumber + index - lineCount,
+      Object.assign(l, {
+        old_line: bottom ? oldLineNumber + index + 1 : oldLineNumber + index - lineCount,
+        new_line: bottom ? newLineNumber + index + 1 : newLineNumber + index - lineCount,
       });
     }
 
-    return line;
+    return l;
   });
 
   if (matchLineIndex > -1) {
@@ -146,9 +143,9 @@ export function addLineReferences(lines, lineNumbers, bottom) {
       : linesWithNumbers[matchLineIndex + 1];
 
     Object.assign(line, {
-      metaData: {
-        oldPos: targetLine.oldLine,
-        newPos: targetLine.newLine,
+      meta_data: {
+        old_pos: targetLine.old_line,
+        new_pos: targetLine.new_line,
       },
     });
   }
@@ -187,11 +184,11 @@ export function trimFirstCharOfLineContent(line = {}) {
 
   const parsedLine = Object.assign({}, line);
 
-  if (line.richText) {
-    const firstChar = parsedLine.richText.charAt(0);
+  if (line.rich_text) {
+    const firstChar = parsedLine.rich_text.charAt(0);
 
     if (firstChar === ' ' || firstChar === '+' || firstChar === '-') {
-      parsedLine.richText = line.richText.substring(1);
+      parsedLine.rich_text = line.rich_text.substring(1);
     }
   }
 
@@ -201,15 +198,15 @@ export function trimFirstCharOfLineContent(line = {}) {
 // This prepares and optimizes the incoming diff data from the server
 // by setting up incremental rendering and removing unneeded data
 export function prepareDiffData(diffData) {
-  const filesLength = diffData.diffFiles.length;
+  const filesLength = diffData.diff_files.length;
   let showingLines = 0;
   for (let i = 0; i < filesLength; i += 1) {
-    const file = diffData.diffFiles[i];
+    const file = diffData.diff_files[i];
 
-    if (file.parallelDiffLines) {
-      const linesLength = file.parallelDiffLines.length;
+    if (file.parallel_diff_lines) {
+      const linesLength = file.parallel_diff_lines.length;
       for (let u = 0; u < linesLength; u += 1) {
-        const line = file.parallelDiffLines[u];
+        const line = file.parallel_diff_lines[u];
         if (line.left) {
           line.left = trimFirstCharOfLineContent(line.left);
         }
@@ -219,13 +216,13 @@ export function prepareDiffData(diffData) {
       }
     }
 
-    if (file.highlightedDiffLines) {
-      const linesLength = file.highlightedDiffLines.length;
+    if (file.highlighted_diff_lines) {
+      const linesLength = file.highlighted_diff_lines.length;
       for (let u = 0; u < linesLength; u += 1) {
-        const line = file.highlightedDiffLines[u];
+        const line = file.highlighted_diff_lines[u];
         Object.assign(line, { ...trimFirstCharOfLineContent(line) });
       }
-      showingLines += file.parallelDiffLines.length;
+      showingLines += file.parallel_diff_lines.length;
     }
 
     Object.assign(file, {
@@ -238,26 +235,21 @@ export function prepareDiffData(diffData) {
 
 export function getDiffPositionByLineCode(diffFiles) {
   return diffFiles.reduce((acc, diffFile) => {
-    const { baseSha, headSha, startSha } = diffFile.diffRefs;
-    const { newPath, oldPath } = diffFile;
-
     // We can only use highlightedDiffLines to create the map of diff lines because
     // highlightedDiffLines will also include every parallel diff line in it.
-    if (diffFile.highlightedDiffLines) {
-      diffFile.highlightedDiffLines.forEach(line => {
-        const { lineCode, oldLine, newLine } = line;
-
-        if (lineCode) {
-          acc[lineCode] = {
-            baseSha,
-            headSha,
-            startSha,
-            newPath,
-            oldPath,
-            oldLine,
-            newLine,
-            lineCode,
-            positionType: 'text',
+    if (diffFile.highlighted_diff_lines) {
+      diffFile.highlighted_diff_lines.forEach(line => {
+        if (line.line_code) {
+          acc[line.line_code] = {
+            base_sha: diffFile.diff_refs.base_sha,
+            head_sha: diffFile.diff_refs.head_sha,
+            start_sha: diffFile.diff_refs.start_sha,
+            new_path: diffFile.new_path,
+            old_path: diffFile.old_path,
+            old_line: line.old_line,
+            new_line: line.new_line,
+            line_code: line.line_code,
+            position_type: 'text',
           };
         }
       });
@@ -270,30 +262,30 @@ export function getDiffPositionByLineCode(diffFiles) {
 // This method will check whether the discussion is still applicable
 // to the diff line in question regarding different versions of the MR
 export function isDiscussionApplicableToLine({ discussion, diffPosition, latestDiff }) {
-  const { lineCode, ...diffPositionCopy } = diffPosition;
+  const { line_code, ...diffPositionCopy } = diffPosition;
 
   if (discussion.original_position && discussion.position) {
-    const originalRefs = convertObjectPropsToCamelCase(discussion.original_position);
-    const refs = convertObjectPropsToCamelCase(discussion.position);
+    const originalRefs = discussion.original_position;
+    const refs = discussion.position;
 
     return _.isEqual(refs, diffPositionCopy) || _.isEqual(originalRefs, diffPositionCopy);
   }
 
-  return latestDiff && discussion.active && lineCode === discussion.line_code;
+  // eslint-disable-next-line
+  return latestDiff && discussion.active && line_code === discussion.line_code;
 }
 
 export const generateTreeList = files =>
   files.reduce(
     (acc, file) => {
-      const { fileHash, addedLines, removedLines, newFile, deletedFile, newPath } = file;
-      const split = newPath.split('/');
+      const split = file.new_path.split('/');
 
       split.forEach((name, i) => {
         const parent = acc.treeEntries[split.slice(0, i).join('/')];
         const path = `${parent ? `${parent.path}/` : ''}${name}`;
 
         if (!acc.treeEntries[path]) {
-          const type = path === newPath ? 'blob' : 'tree';
+          const type = path === file.new_path ? 'blob' : 'tree';
           acc.treeEntries[path] = {
             key: path,
             path,
@@ -307,11 +299,11 @@ export const generateTreeList = files =>
           if (type === 'blob') {
             Object.assign(entry, {
               changed: true,
-              tempFile: newFile,
-              deleted: deletedFile,
-              fileHash,
-              addedLines,
-              removedLines,
+              tempFile: file.new_file,
+              deleted: file.deleted_file,
+              fileHash: file.file_hash,
+              addedLines: file.added_lines,
+              removedLines: file.removed_lines,
             });
           } else {
             Object.assign(entry, {
@@ -329,6 +321,6 @@ export const generateTreeList = files =>
   );
 
 export const getDiffMode = diffFile => {
-  const diffModeKey = Object.keys(diffModes).find(key => diffFile[`${key}File`]);
+  const diffModeKey = Object.keys(diffModes).find(key => diffFile[`${key}_file`]);
   return diffModes[diffModeKey] || diffModes.replaced;
 };
diff --git a/app/assets/javascripts/notes/components/diff_with_note.vue b/app/assets/javascripts/notes/components/diff_with_note.vue
index b209f736c3f..080161dfbba 100644
--- a/app/assets/javascripts/notes/components/diff_with_note.vue
+++ b/app/assets/javascripts/notes/components/diff_with_note.vue
@@ -1,6 +1,5 @@
 <script>
 import { mapState, mapActions } from 'vuex';
-import { convertObjectPropsToCamelCase } from '~/lib/utils/common_utils';
 import DiffFileHeader from '~/diffs/components/diff_file_header.vue';
 import DiffViewer from '~/vue_shared/components/diff_viewer/diff_viewer.vue';
 import ImageDiffOverlay from '~/diffs/components/image_diff_overlay.vue';
@@ -34,7 +33,9 @@ export default {
       return getDiffMode(this.diffFile);
     },
     hasTruncatedDiffLines() {
-      return this.discussion.truncatedDiffLines && this.discussion.truncatedDiffLines.length !== 0;
+      return (
+        this.discussion.truncated_diff_lines && this.discussion.truncated_diff_lines.length !== 0
+      );
     },
     isDiscussionsExpanded() {
       return true; // TODO: @fatihacet - Fix this.
@@ -50,19 +51,17 @@ export default {
       return text ? 'text-file' : 'js-image-file';
     },
     diffFile() {
-      return convertObjectPropsToCamelCase(this.discussion.diffFile, { deep: true });
+      return this.discussion.diff_file;
     },
     imageDiffHtml() {
-      return this.discussion.imageDiffHtml;
+      return this.discussion.image_diff_html;
     },
     userColorScheme() {
       return window.gon.user_color_scheme;
     },
     normalizedDiffLines() {
-      if (this.discussion.truncatedDiffLines) {
-        return this.discussion.truncatedDiffLines.map(line =>
-          trimFirstCharOfLineContent(convertObjectPropsToCamelCase(line)),
-        );
+      if (this.discussion.truncated_diff_lines) {
+        return this.discussion.truncated_diff_lines.map(line => trimFirstCharOfLineContent(line));
       }
 
       return [];
@@ -97,7 +96,7 @@ export default {
     class="diff-file file-holder"
   >
     <diff-file-header
-      :discussion-path="discussion.discussionPath"
+      :discussion-path="discussion.discussion_path"
       :diff-file="diffFile"
       :can-current-user-fork="false"
       :discussions-expanded="isDiscussionsExpanded"
@@ -111,15 +110,15 @@ export default {
       <table>
         <tr
           v-for="line in normalizedDiffLines"
-          :key="line.lineCode"
+          :key="line.line_code"
           class="line_holder"
         >
-          <td class="diff-line-num old_line">{{ line.oldLine }}</td>
-          <td class="diff-line-num new_line">{{ line.newLine }}</td>
+          <td class="diff-line-num old_line">{{ line.old_line }}</td>
+          <td class="diff-line-num new_line">{{ line.new_line }}</td>
           <td
             :class="line.type"
             class="line_content"
-            v-html="line.richText"
+            v-html="line.rich_text"
           >
           </td>
         </tr>
@@ -165,17 +164,17 @@ export default {
     >
       <diff-viewer
         :diff-mode="diffMode"
-        :new-path="diffFile.newPath"
-        :new-sha="diffFile.diffRefs.headSha"
-        :old-path="diffFile.oldPath"
-        :old-sha="diffFile.diffRefs.baseSha"
-        :file-hash="diffFile.fileHash"
+        :new-path="diffFile.new_path"
+        :new-sha="diffFile.diff_refs.head_sha"
+        :old-path="diffFile.old_path"
+        :old-sha="diffFile.diff_refs.base_sha"
+        :file-hash="diffFile.file_hash"
         :project-path="projectPath"
       >
         <image-diff-overlay
           slot="image-overlay"
           :discussions="discussion"
-          :file-hash="diffFile.fileHash"
+          :file-hash="diffFile.file_hash"
           :show-comment-icon="true"
           :should-toggle-discussion="false"
           badge-class="image-comment-badge"
diff --git a/app/assets/javascripts/notes/components/noteable_discussion.vue b/app/assets/javascripts/notes/components/noteable_discussion.vue
index c1dfa036678..7740967ccd5 100644
--- a/app/assets/javascripts/notes/components/noteable_discussion.vue
+++ b/app/assets/javascripts/notes/components/noteable_discussion.vue
@@ -1,6 +1,5 @@
 <script>
 import { mapActions, mapGetters } from 'vuex';
-import { convertObjectPropsToCamelCase } from '~/lib/utils/common_utils';
 import { truncateSha } from '~/lib/utils/text_utility';
 import { s__ } from '~/locale';
 import systemNote from '~/vue_shared/components/notes/system_note.vue';
@@ -88,17 +87,16 @@ export default {
     transformedDiscussion() {
       return {
         ...this.discussion.notes[0],
-        truncatedDiffLines: this.discussion.truncated_diff_lines || [],
-        truncatedDiffLinesPath: this.discussion.truncated_diff_lines_path,
-        diffFile: this.discussion.diff_file,
-        diffDiscussion: this.discussion.diff_discussion,
-        imageDiffHtml: this.discussion.image_diff_html,
+        truncated_diff_lines: this.discussion.truncated_diff_lines || [],
+        truncated_diff_lines_path: this.discussion.truncated_diff_lines_path,
+        diff_file: this.discussion.diff_file,
+        diff_discussion: this.discussion.diff_discussion,
         active: this.discussion.active,
-        discussionPath: this.discussion.discussion_path,
+        discussion_path: this.discussion.discussion_path,
         resolved: this.discussion.resolved,
-        resolvedBy: this.discussion.resolved_by,
-        resolvedByPush: this.discussion.resolved_by_push,
-        resolvedAt: this.discussion.resolved_at,
+        resolved_by: this.discussion.resolved_by,
+        resolved_by_push: this.discussion.resolved_by_push,
+        resolved_at: this.discussion.resolved_at,
       };
     },
     author() {
@@ -138,7 +136,7 @@ export default {
       return null;
     },
     resolvedText() {
-      return this.transformedDiscussion.resolvedByPush ? 'Automatically resolved' : 'Resolved';
+      return this.transformedDiscussion.resolved_by_push ? 'Automatically resolved' : 'Resolved';
     },
     hasMultipleUnresolvedDiscussions() {
       return this.unresolvedDiscussions.length > 1;
@@ -150,12 +148,14 @@ export default {
       );
     },
     shouldRenderDiffs() {
-      const { diffDiscussion, diffFile } = this.transformedDiscussion;
-
-      return diffDiscussion && diffFile && this.renderDiffFile;
+      return (
+        this.transformedDiscussion.diff_discussion &&
+        this.transformedDiscussion.diff_file &&
+        this.renderDiffFile
+      );
     },
     shouldGroupReplies() {
-      return !this.shouldRenderDiffs && !this.transformedDiscussion.diffDiscussion;
+      return !this.shouldRenderDiffs && !this.transformedDiscussion.diff_discussion;
     },
     shouldRenderHeader() {
       return this.shouldRenderDiffs;
@@ -165,7 +165,7 @@ export default {
     },
     wrapperComponentProps() {
       if (this.shouldRenderDiffs) {
-        return { discussion: convertObjectPropsToCamelCase(this.discussion) };
+        return { discussion: this.discussion };
       }
 
       return {};
@@ -184,8 +184,8 @@ export default {
     },
     shouldShowDiscussions() {
       const isExpanded = this.discussion.expanded;
-      const { diffDiscussion, resolved } = this.transformedDiscussion;
-      const isResolvedNonDiffDiscussion = !diffDiscussion && resolved;
+      const { resolved } = this.transformedDiscussion;
+      const isResolvedNonDiffDiscussion = !this.transformedDiscussion.diff_discussion && resolved;
 
       return isExpanded || this.alwaysExpanded || isResolvedNonDiffDiscussion;
     },
@@ -333,9 +333,9 @@ Please check your network connection and try again.`;
               :expanded="discussion.expanded"
               @toggleHandler="toggleDiscussionHandler"
             >
-              <template v-if="transformedDiscussion.diffDiscussion">
+              <template v-if="transformedDiscussion.diff_discussion">
                 started a discussion on
-                <a :href="transformedDiscussion.discussionPath">
+                <a :href="transformedDiscussion.discussion_path">
                   <template v-if="transformedDiscussion.active">
                     the diff
                   </template>
@@ -356,8 +356,8 @@ Please check your network connection and try again.`;
             </note-header>
             <note-edited-text
               v-if="transformedDiscussion.resolved"
-              :edited-at="transformedDiscussion.resolvedAt"
-              :edited-by="transformedDiscussion.resolvedBy"
+              :edited-at="transformedDiscussion.resolved_at"
+              :edited-by="transformedDiscussion.resolved_by"
               :action-text="resolvedText"
               class-name="discussion-headline-light js-discussion-headline"
             />
diff --git a/app/assets/javascripts/notes/stores/actions.js b/app/assets/javascripts/notes/stores/actions.js
index a4ab079d258..5b2f0540020 100644
--- a/app/assets/javascripts/notes/stores/actions.js
+++ b/app/assets/javascripts/notes/stores/actions.js
@@ -341,7 +341,7 @@ export const scrollToNoteIfNeeded = (context, el) => {
 };
 
 export const fetchDiscussionDiffLines = ({ commit }, discussion) =>
-  axios.get(discussion.truncatedDiffLinesPath).then(({ data }) => {
+  axios.get(discussion.truncated_diff_lines_path).then(({ data }) => {
     commit(types.SET_DISCUSSION_DIFF_LINES, {
       discussionId: discussion.id,
       diffLines: data.truncated_diff_lines,
diff --git a/app/assets/javascripts/notes/stores/mutations.js b/app/assets/javascripts/notes/stores/mutations.js
index c8d9e196103..f6054e0be87 100644
--- a/app/assets/javascripts/notes/stores/mutations.js
+++ b/app/assets/javascripts/notes/stores/mutations.js
@@ -102,7 +102,7 @@ export default {
     discussionsData.forEach(discussion => {
       if (discussion.diff_file) {
         Object.assign(discussion, {
-          fileHash: discussion.diff_file.file_hash,
+          file_hash: discussion.diff_file.file_hash,
           truncated_diff_lines: discussion.truncated_diff_lines || [],
         });
       }
@@ -195,7 +195,7 @@ export default {
     const selectedDiscussion = state.discussions.find(disc => disc.id === note.id);
     note.expanded = true; // override expand flag to prevent collapse
     if (note.diff_file) {
-      Object.assign(note, { fileHash: note.diff_file.file_hash });
+      Object.assign(note, { file_hash: note.diff_file.file_hash });
     }
     Object.assign(selectedDiscussion, { ...note });
   },