Merge remote-tracking branch 'upstream/master' into 14995-custom_wiki_sidebar

* upstream/master: (4180 commits)
  Enable frozen string literals for app/workers/*.rb
  Resolve "Search dropdown hides & shows when typing"
  Revert merge request widget button max height
  Update CHANGELOG.md for 11.0.2
  Update external link icon in header user dropdown
  Added Diff Viewer to new VUE based MR page
  Fixed eslint failure in IDE spec helpers
  Use refs instead of querySelector.
  Show file in tree on WebIDE open
  Resolve "Remove unused bootstrap component CSS"
  Resolve "Explain what Groups are in the New Group page"
  [QA] Make sure we wait for the deploy key list to load
  Update _scopes_form.html.haml to remove duplicate information
  Use the branch instead of the tag to install
  port the EE changes
  Add index on deployable_type/id for deployments
  Add a helper to rename a column using a background migration
  Fix performance bottleneck when rendering large wiki pages
  Port Namespace#root_ancestor to CE
  Remove duplicate spec
  ...

1 files changed, 24 insertions, 5 deletions

diff --git a/lib/gitlab/import_export/relation_factory.rb b/lib/gitlab/import_export/relation_factory.rb
index 791a54e1b69..c5cf290f191 100644
--- a/lib/gitlab/import_export/relation_factory.rb
+++ b/lib/gitlab/import_export/relation_factory.rb
@@ -17,9 +17,11 @@ module Gitlab
                     auto_devops: :project_auto_devops,
                     label: :project_label,
                     custom_attributes: 'ProjectCustomAttribute',
-                    project_badges: 'Badge' }.freeze
+                    project_badges: 'Badge',
+                    metrics: 'MergeRequest::Metrics',
+                    ci_cd_settings: 'ProjectCiCdSetting' }.freeze
 
-      USER_REFERENCES = %w[author_id assignee_id updated_by_id user_id created_by_id last_edited_by_id merge_user_id resolved_by_id].freeze
+      USER_REFERENCES = %w[author_id assignee_id updated_by_id merged_by_id latest_closed_by_id user_id created_by_id last_edited_by_id merge_user_id resolved_by_id closed_by_id].freeze
 
       PROJECT_REFERENCES = %w[project_id source_project_id target_project_id].freeze
 
@@ -27,7 +29,7 @@ module Gitlab
 
       IMPORTED_OBJECT_MAX_RETRIES = 5.freeze
 
-      EXISTING_OBJECT_CHECK = %i[milestone milestones label labels project_label project_labels group_label group_labels].freeze
+      EXISTING_OBJECT_CHECK = %i[milestone milestones label labels project_label project_labels group_label group_labels project_feature].freeze
 
       TOKEN_RESET_MODELS = %w[Ci::Trigger Ci::Build ProjectHook].freeze
 
@@ -35,13 +37,30 @@ module Gitlab
         new(*args).create
       end
 
-      def initialize(relation_sym:, relation_hash:, members_mapper:, user:, project:)
+      def self.relation_class(relation_name)
+        # There are scenarios where the model is pluralized (e.g.
+        # MergeRequest::Metrics), and we don't want to force it to singular
+        # with #classify.
+        relation_name.to_s.classify.constantize
+      rescue NameError
+        relation_name.to_s.constantize
+      end
+
+      def initialize(relation_sym:, relation_hash:, members_mapper:, user:, project:, excluded_keys: [])
         @relation_name = OVERRIDES[relation_sym] || relation_sym
         @relation_hash = relation_hash.except('noteable_id')
         @members_mapper = members_mapper
         @user = user
         @project = project
         @imported_object_retries = 0
+
+        # Remove excluded keys from relation_hash
+        # We don't do this in the parsed_relation_hash because of the 'transformed attributes'
+        # For example, MergeRequestDiffFiles exports its diff attribute as utf8_diff. Then,
+        # in the create method that attribute is renamed to diff. And because diff is an excluded key,
+        # if we clean the excluded keys in the parsed_relation_hash, it will be removed
+        # from the object attributes and the export will fail.
+        @relation_hash.except!(*excluded_keys)
       end
 
       # Creates an object from an actual model with name "relation_sym" with params from
@@ -186,7 +205,7 @@ module Gitlab
       end
 
       def relation_class
-        @relation_class ||= @relation_name.to_s.classify.constantize
+        @relation_class ||= self.class.relation_class(@relation_name)
       end
 
       def imported_object