1 files changed, 32 insertions, 28 deletions

diff --git a/app/controllers/projects/merge_requests_controller.rb b/app/controllers/projects/merge_requests_controller.rb
index 31d7c324e55..941d68cda17 100644
--- a/app/controllers/projects/merge_requests_controller.rb
+++ b/app/controllers/projects/merge_requests_controller.rb
@@ -10,7 +10,6 @@ class Projects::MergeRequestsController < Projects::ApplicationController
     :edit, :update, :show, :diffs, :commits, :builds, :merge, :merge_check,
     :ci_status, :toggle_subscription, :cancel_merge_when_build_succeeds, :remove_wip
   ]
-  before_action :closes_issues, only: [:edit, :update, :show, :diffs, :commits, :builds]
   before_action :validates_merge_request, only: [:show, :diffs, :commits, :builds]
   before_action :define_show_vars, only: [:show, :diffs, :commits, :builds]
   before_action :define_widget_vars, only: [:merge, :cancel_merge_when_build_succeeds, :merge_check]
@@ -56,9 +55,6 @@ class Projects::MergeRequestsController < Projects::ApplicationController
   end
 
   def show
-    @note_counts = Note.where(commit_id: @merge_request.commits.map(&:id)).
-      group(:commit_id).count
-
     respond_to do |format|
       format.html
 
@@ -83,6 +79,8 @@ class Projects::MergeRequestsController < Projects::ApplicationController
   def diffs
     apply_diff_view_cookie!
 
+    @merge_request_diff = @merge_request.merge_request_diff
+
     respond_to do |format|
       format.html
       format.json { render json: { html: view_to_html_string("projects/merge_requests/show/_diffs") } }
@@ -111,7 +109,15 @@ class Projects::MergeRequestsController < Projects::ApplicationController
   def commits
     respond_to do |format|
       format.html { render 'show' }
-      format.json { render json: { html: view_to_html_string('projects/merge_requests/show/_commits') } }
+      format.json do
+        # Get commits from repository
+        # or from cache if already merged
+        @commits = @merge_request.commits
+        @note_counts = Note.where(commit_id: @commits.map(&:id)).
+          group(:commit_id).count
+
+        render json: { html: view_to_html_string('projects/merge_requests/show/_commits') }
+      end
     end
   end
 
@@ -309,10 +315,6 @@ class Projects::MergeRequestsController < Projects::ApplicationController
   alias_method :issuable, :merge_request
   alias_method :awardable, :merge_request
 
-  def closes_issues
-    @closes_issues ||= @merge_request.closes_issues
-  end
-
   def authorize_update_merge_request!
     return render_404 unless can?(current_user, :update_merge_request, @merge_request)
   end
@@ -341,14 +343,33 @@ class Projects::MergeRequestsController < Projects::ApplicationController
   end
 
   def define_show_vars
+    @noteable = @merge_request
+    @commits_count = @merge_request.commits.count
+
+    @pipeline = @merge_request.pipeline
+    @statuses = @pipeline.statuses if @pipeline
+
+    if @merge_request.locked_long_ago?
+      @merge_request.unlock_mr
+      @merge_request.close
+    end
+
+    if request.format == :html || action_name == 'show'
+      define_show_html_vars
+    end
+  end
+
+  # Discussion tab data is only required on html requests
+  def define_show_html_vars
     # Build a note object for comment form
-    @note = @project.notes.new(noteable: @merge_request)
+    @note = @project.notes.new(noteable: @noteable)
 
-    @discussions = @merge_request.mr_and_commit_notes.
+    @discussions = @noteable.mr_and_commit_notes.
       inc_author_project_award_emoji.
       fresh.
       discussions
 
+    # This is not executed lazily
     @notes = Banzai::NoteRenderer.render(
       @discussions.flatten,
       @project,
@@ -357,28 +378,11 @@ class Projects::MergeRequestsController < Projects::ApplicationController
       @project_wiki,
       @ref
     )
-
-    @noteable = @merge_request
-
-    # Get commits from repository
-    # or from cache if already merged
-    @commits = @merge_request.commits
-
-    @merge_request_diff = @merge_request.merge_request_diff
-
-    @pipeline = @merge_request.pipeline
-    @statuses = @pipeline.statuses if @pipeline
-
-    if @merge_request.locked_long_ago?
-      @merge_request.unlock_mr
-      @merge_request.close
-    end
   end
 
   def define_widget_vars
     @pipeline = @merge_request.pipeline
     @pipelines = [@pipeline].compact
-    closes_issues
   end
 
   def define_commit_vars