Merge branch 'issue-boards-issues-total-count' into 'master'

Add the total number of issues in the JSON response in issue board lists

## What does this MR do?

Add the total number of issues in the JSON response in issue board lists

## Why was this MR needed?

The issue board lists should always show the total number of issues in the list, not the current amount fetched by endless scroll.

Closes #21327

See merge request !5904

8 files changed, 94 insertions, 34 deletions

diff --git a/app/assets/javascripts/boards/components/board_list.js.es6 b/app/assets/javascripts/boards/components/board_list.js.es6
index a6644e9eb8c..50fc11d7737 100644
--- a/app/assets/javascripts/boards/components/board_list.js.es6
+++ b/app/assets/javascripts/boards/components/board_list.js.es6
@@ -20,7 +20,8 @@
     data () {
       return {
         scrollOffset: 250,
-        filters: Store.state.filters
+        filters: Store.state.filters,
+        showCount: false
       };
     },
     watch: {
@@ -30,6 +31,15 @@
           this.$els.list.scrollTop = 0;
         },
         deep: true
+      },
+      issues () {
+        this.$nextTick(() => {
+          if (this.scrollHeight() > this.listHeight()) {
+            this.showCount = true;
+          } else {
+            this.showCount = false;
+          }
+        });
       }
     },
     methods: {
@@ -58,6 +68,7 @@
         group: 'issues',
         sort: false,
         disabled: this.disabled,
+        filter: '.board-list-count',
         onStart: (e) => {
           const card = this.$refs.issue[e.oldIndex];
 
diff --git a/app/assets/javascripts/boards/models/list.js.es6 b/app/assets/javascripts/boards/models/list.js.es6
index 816fa49516c..91fd620fdb3 100644
--- a/app/assets/javascripts/boards/models/list.js.es6
+++ b/app/assets/javascripts/boards/models/list.js.es6
@@ -11,6 +11,7 @@ class List {
     this.loading = true;
     this.loadingMore = false;
     this.issues = [];
+    this.issuesSize = 0;
 
     if (obj.label) {
       this.label = new ListLabel(obj.label);
@@ -51,7 +52,7 @@ class List {
   }
 
   nextPage () {
-    if (Math.floor(this.issues.length / 20) === this.page) {
+    if (this.issuesSize > this.issues.length) {
       this.page++;
 
       return this.getIssues(false);
@@ -76,12 +77,13 @@ class List {
       .then((resp) => {
         const data = resp.json();
         this.loading = false;
+        this.issuesSize = data.size;
 
         if (emptyIssues) {
           this.issues = [];
         }
 
-        this.createIssues(data);
+        this.createIssues(data.issues);
       });
   }
 
@@ -92,14 +94,20 @@ class List {
   }
 
   addIssue (issue, listFrom) {
-    this.issues.push(issue);
+    if (!this.findIssue(issue.id)) {
+      this.issues.push(issue);
 
-    if (this.label) {
-      issue.addLabel(this.label);
-    }
+      if (this.label) {
+        issue.addLabel(this.label);
+      }
 
-    if (listFrom) {
-      gl.boardService.moveIssue(issue.id, listFrom.id, this.id);
+      if (listFrom) {
+        this.issuesSize++;
+        gl.boardService.moveIssue(issue.id, listFrom.id, this.id)
+          .then(() => {
+            listFrom.getIssues(false);
+          });
+      }
     }
   }
 
@@ -112,6 +120,7 @@ class List {
       const matchesRemove = removeIssue.id === issue.id;
 
       if (matchesRemove) {
+        this.issuesSize--;
         issue.removeLabel(this.label);
       }
 
diff --git a/app/assets/stylesheets/pages/boards.scss b/app/assets/stylesheets/pages/boards.scss
index d91558bc672..037278bb083 100644
--- a/app/assets/stylesheets/pages/boards.scss
+++ b/app/assets/stylesheets/pages/boards.scss
@@ -142,11 +142,6 @@
   }
 }
 
-.board-header-loading-spinner {
-  margin-right: 10px;
-  color: $gray-darkest;
-}
-
 .board-inner-container {
   border-bottom: 1px solid $border-color;
   padding: $gl-padding;
@@ -279,3 +274,13 @@
     width: 210px;
   }
 }
+
+.board-list-count {
+  padding: 10px 0;
+  color: $gl-placeholder-color;
+  font-size: 13px;
+
+  > .fa {
+    margin-right: 5px;
+  }
+}
diff --git a/app/controllers/projects/boards/issues_controller.rb b/app/controllers/projects/boards/issues_controller.rb
index 1a4f6b50e8f..9404612a993 100644
--- a/app/controllers/projects/boards/issues_controller.rb
+++ b/app/controllers/projects/boards/issues_controller.rb
@@ -8,12 +8,15 @@ module Projects
         issues = ::Boards::Issues::ListService.new(project, current_user, filter_params).execute
         issues = issues.page(params[:page])
 
-        render json: issues.as_json(
-          only: [:iid, :title, :confidential],
-          include: {
-            assignee: { only: [:id, :name, :username], methods: [:avatar_url] },
-            labels:   { only: [:id, :title, :description, :color, :priority], methods: [:text_color] }
-          })
+        render json: {
+          issues: issues.as_json(
+            only: [:iid, :title, :confidential],
+            include: {
+              assignee: { only: [:id, :name, :username], methods: [:avatar_url] },
+              labels:   { only: [:id, :title, :description, :color, :priority], methods: [:text_color] }
+            }),
+          size: issues.total_count
+        }
       end
 
       def update
diff --git a/app/views/projects/boards/components/_board.html.haml b/app/views/projects/boards/components/_board.html.haml
index 6b4bfe0c354..73066150fb3 100644
--- a/app/views/projects/boards/components/_board.html.haml
+++ b/app/views/projects/boards/components/_board.html.haml
@@ -13,14 +13,13 @@
         %h3.board-title.js-board-handle{ ":class" => "{ 'user-can-drag': (!disabled && !list.preset) }" }
           {{ list.title }}
           %span.pull-right{ "v-if" => "list.type !== 'blank'" }
-            {{ list.issues.length }}
+            {{ list.issuesSize }}
           - if can?(current_user, :admin_list, @project)
             %board-delete{ "inline-template" => true,
               ":list" => "list",
               "v-if" => "!list.preset && list.id" }
               %button.board-delete.has-tooltip.pull-right{ type: "button", title: "Delete list", "aria-label" => "Delete list", data: { placement: "bottom" }, "@click.stop" => "deleteBoard" }
                 = icon("trash")
-          = icon("spinner spin", class: "board-header-loading-spinner pull-right", "v-show" => "list.loadingMore")
       %board-list{ "inline-template" => true,
         "v-if" => "list.type !== 'blank'",
         ":list" => "list",
@@ -34,5 +33,11 @@
           "v-show" => "!loading",
           ":data-board" => "list.id" }
           = render "projects/boards/components/card"
+          %li.board-list-count.text-center{ "v-if" => "showCount" }
+            = icon("spinner spin", "v-show" => "list.loadingMore" )
+            %span{ "v-if" => "list.issues.length === list.issuesSize" }
+              Showing all issues
+            %span{ "v-else" => true }
+              Showing {{ list.issues.length }} of {{ list.issuesSize }} issues
       - if can?(current_user, :admin_list, @project)
         = render "projects/boards/components/blank_state"
diff --git a/spec/features/boards/boards_spec.rb b/spec/features/boards/boards_spec.rb
index 55e5dc15428..c6c2e2095df 100644
--- a/spec/features/boards/boards_spec.rb
+++ b/spec/features/boards/boards_spec.rb
@@ -182,14 +182,21 @@ describe 'Issue Boards', feature: true, js: true do
       wait_for_vue_resource
 
       page.within(find('.board', match: :first)) do
-        expect(page.find('.board-header')).to have_content('20')
+        expect(page.find('.board-header')).to have_content('56')
         expect(page).to have_selector('.card', count: 20)
+        expect(page).to have_content('Showing 20 of 56 issues')
 
         evaluate_script("document.querySelectorAll('.board .board-list')[0].scrollTop = document.querySelectorAll('.board .board-list')[0].scrollHeight")
         wait_for_vue_resource(spinner: false)
 
-        expect(page.find('.board-header')).to have_content('40')
         expect(page).to have_selector('.card', count: 40)
+        expect(page).to have_content('Showing 40 of 56 issues')
+
+        evaluate_script("document.querySelectorAll('.board .board-list')[0].scrollTop = document.querySelectorAll('.board .board-list')[0].scrollHeight")
+        wait_for_vue_resource(spinner: false)
+
+        expect(page).to have_selector('.card', count: 56)
+        expect(page).to have_content('Showing all issues')
       end
     end
 
@@ -479,13 +486,19 @@ describe 'Issue Boards', feature: true, js: true do
         wait_for_vue_resource
 
         page.within(find('.board', match: :first)) do
-          expect(page.find('.board-header')).to have_content('20')
+          expect(page.find('.board-header')).to have_content('51')
           expect(page).to have_selector('.card', count: 20)
+          expect(page).to have_content('Showing 20 of 51 issues')
 
           evaluate_script("document.querySelectorAll('.board .board-list')[0].scrollTop = document.querySelectorAll('.board .board-list')[0].scrollHeight")
 
-          expect(page.find('.board-header')).to have_content('40')
           expect(page).to have_selector('.card', count: 40)
+          expect(page).to have_content('Showing 40 of 51 issues')
+
+          evaluate_script("document.querySelectorAll('.board .board-list')[0].scrollTop = document.querySelectorAll('.board .board-list')[0].scrollHeight")
+
+          expect(page).to have_selector('.card', count: 51)
+          expect(page).to have_content('Showing all issues')
         end
       end
 
diff --git a/spec/fixtures/api/schemas/issues.json b/spec/fixtures/api/schemas/issues.json
index 0d2067f704a..70771b21c96 100644
--- a/spec/fixtures/api/schemas/issues.json
+++ b/spec/fixtures/api/schemas/issues.json
@@ -1,4 +1,15 @@
 {
-  "type": "array",
-  "items": { "$ref": "issue.json" }
+  "type": "object",
+  "required" : [
+    "issues",
+    "size"
+  ],
+  "properties" : {
+    "issues": {
+      "type": "array",
+      "items": { "$ref": "issue.json" }
+    },
+    "size": { "type": "integer" }
+  },
+  "additionalProperties": false
 }
diff --git a/spec/javascripts/boards/mock_data.js.es6 b/spec/javascripts/boards/mock_data.js.es6
index 0c37ec8354f..f3797ed44d4 100644
--- a/spec/javascripts/boards/mock_data.js.es6
+++ b/spec/javascripts/boards/mock_data.js.es6
@@ -26,12 +26,15 @@ const listObjDuplicate = {
 
 const BoardsMockData = {
   'GET': {
-    '/test/issue-boards/board/lists{/id}/issues': [{
-      title: 'Testing',
-      iid: 1,
-      confidential: false,
-      labels: []
-    }]
+    '/test/issue-boards/board/lists{/id}/issues': {
+      issues: [{
+        title: 'Testing',
+        iid: 1,
+        confidential: false,
+        labels: []
+      }],
+      size: 1
+    }
   },
   'POST': {
     '/test/issue-boards/board/lists{/id}': listObj