Backport some changes done from Time Tracking feature in EE.

app/controllers/concerns/issuable_actions.rb

@@ -12,7 +12,7 @@ module IssuableActions
     destroy_method = "destroy_#{issuable.class.name.underscore}".to_sym
     TodoService.new.public_send(destroy_method, issuable, current_user)
-    name = issuable.class.name.titleize.downcase
+    name = issuable.human_class_name
     flash[:notice] = "The #{name} was successfully deleted."
     redirect_to polymorphic_path([@project.namespace.becomes(Namespace), @project, issuable.class])
   end

app/controllers/projects/issues_controller.rb

@@ -69,7 +69,7 @@ class Projects::IssuesController < Projects::ApplicationController
     respond_to do |format|
       format.html
       format.json do
-        render json: @issue.to_json(include: [:milestone, :labels])
+        render json: IssueSerializer.new.represent(@issue)
       end
     end
   end

app/controllers/projects/merge_requests_controller.rb

@@ -61,7 +61,7 @@ class Projects::MergeRequestsController < Projects::ApplicationController
       format.html { define_discussion_vars }
       format.json do
-        render json: @merge_request
+        render json: MergeRequestSerializer.new.represent(@merge_request)
       end
       format.patch  do

app/controllers/projects/notes_controller.rb

@@ -146,24 +146,26 @@ class Projects::NotesController < Projects::ApplicationController
   end
   def note_json(note)
+    attrs = {
+      award: false,
+      id: note.id
+    }
+
     if note.is_a?(AwardEmoji)
-      {
+      attrs.merge!(
         valid:  note.valid?,
         award:  true,
-        id:     note.id,
         name:   note.name
-      }
+      )
     elsif note.persisted?
       Banzai::NoteRenderer.render([note], @project, current_user)
-      attrs = {
+      attrs.merge!(
         valid: true,
-        id: note.id,
         discussion_id: note.discussion_id,
         html: note_html(note),
-        award: false,
         note: note.note
-      }
+      )
       if note.diff_note?
         discussion = note.to_discussion
@@ -188,15 +190,14 @@ class Projects::NotesController < Projects::ApplicationController
           attrs[:original_discussion_id] = note.original_discussion_id
         end
       end
-
-      attrs
     else
-      {
+      attrs.merge!(
         valid: false,
-        award: false,
         errors: note.errors
-      }
+      )
     end
+
+    attrs
   end
   def authorize_admin_note!

app/models/concerns/issuable.rb

@@ -251,6 +251,17 @@ module Issuable
     self.class.to_ability_name
   end
+  # Convert this Issuable class name to a format usable by notifications.
+  #
+  # Examples:
+  #
+  #   issuable.class           # => MergeRequest
+  #   issuable.human_class_name # => "merge request"
+
+  def human_class_name
+    @human_class_name ||= self.class.name.titleize.downcase
+  end
+
   # Returns a Hash of attributes to be used for Twitter card metadata
   def card_attributes
     {

app/serializers/issuable_entity.rb

+class IssuableEntity < Grape::Entity
+  expose :id
+  expose :iid
+  expose :assignee_id
+  expose :author_id
+  expose :description
+  expose :lock_version
+  expose :milestone_id
+  expose :position
+  expose :state
+  expose :title
+  expose :updated_by_id
+  expose :created_at
+  expose :updated_at
+  expose :deleted_at
+end

app/serializers/issue_entity.rb

+class IssueEntity < IssuableEntity
+  expose :branch_name
+  expose :confidential
+  expose :due_date
+  expose :moved_to_id
+  expose :project_id
+  expose :milestone, using: API::Entities::Milestone
+  expose :labels, using: LabelEntity
+end

app/serializers/issue_serializer.rb

+class IssueSerializer < BaseSerializer
+  entity IssueEntity
+end

app/serializers/label_entity.rb

+class LabelEntity < Grape::Entity
+  expose :id
+  expose :title
+  expose :color
+  expose :description
+  expose :group_id
+  expose :project_id
+  expose :template
+  expose :created_at
+  expose :updated_at
+end

app/serializers/merge_request_entity.rb

+class MergeRequestEntity < IssuableEntity
+  expose :in_progress_merge_commit_sha
+  expose :locked_at
+  expose :merge_commit_sha
+  expose :merge_error
+  expose :merge_params
+  expose :merge_status
+  expose :merge_user_id
+  expose :merge_when_build_succeeds
+  expose :source_branch
+  expose :source_project_id
+  expose :target_branch
+  expose :target_project_id
+end

app/serializers/merge_request_serializer.rb

+class MergeRequestSerializer < BaseSerializer
+  entity MergeRequestEntity
+end

app/services/notes/create_service.rb

@@ -35,7 +35,7 @@ module Notes
         todo_service.new_note(note, current_user)
       end
-      if command_params && command_params.any?
+      if command_params.present?
         slash_commands_service.execute(command_params, note)
         # We must add the error after we call #save because errors are reset

app/views/shared/issuable/_form.html.haml

@@ -125,7 +125,7 @@
   - else
     .pull-right
       - if can?(current_user, :"destroy_#{issuable.to_ability_name}", @project)
-        = link_to 'Delete', polymorphic_path([@project.namespace.becomes(Namespace), @project, issuable]), data: { confirm: "#{issuable.class.name.titleize} will be removed! Are you sure?" },
+        = link_to 'Delete', polymorphic_path([@project.namespace.becomes(Namespace), @project, issuable]), data: { confirm: "#{issuable.human_class_name} will be removed! Are you sure?" },
                                                                                                   method: :delete, class: 'btn btn-danger btn-grouped'
       = link_to 'Cancel', polymorphic_path([@project.namespace.becomes(Namespace), @project, issuable]), class: 'btn btn-grouped btn-cancel'