1 files changed, 10 insertions, 8 deletions

diff --git a/app/controllers/projects/merge_requests_controller.rb b/app/controllers/projects/merge_requests_controller.rb
index b99ccd453b8..0352065998b 100644
--- a/app/controllers/projects/merge_requests_controller.rb
+++ b/app/controllers/projects/merge_requests_controller.rb
@@ -9,14 +9,15 @@ class Projects::MergeRequestsController < Projects::ApplicationController
 
   before_action :module_enabled
   before_action :merge_request, only: [
-    :edit, :update, :show, :diffs, :commits, :conflicts, :conflict_for_path, :pipelines, :merge, :merge_check,
+    :edit, :update, :show, :diffs, :commits, :conflicts, :conflict_for_path, :pipelines, :merge,
     :pipeline_status, :ci_environments_status, :toggle_subscription, :cancel_merge_when_pipeline_succeeds, :remove_wip, :resolve_conflicts, :assign_related_issues, :commit_change_content
   ]
   before_action :validates_merge_request, only: [:show, :diffs, :commits, :pipelines]
-  before_action :define_show_vars, only: [:show, :diffs, :commits, :conflicts, :conflict_for_path, :builds, :pipelines]
+  before_action :define_show_vars, only: [:diffs, :commits, :conflicts, :conflict_for_path, :builds, :pipelines]
   before_action :define_commit_vars, only: [:diffs]
   before_action :ensure_ref_fetched, only: [:show, :diffs, :commits, :builds, :conflicts, :conflict_for_path, :pipelines]
   before_action :close_merge_request_without_source_project, only: [:show, :diffs, :commits, :builds, :pipelines]
+  before_action :check_if_can_be_merged, only: :show
   before_action :apply_diff_view_cookie!, only: [:new_diffs]
   before_action :build_merge_request, only: [:new, :new_diffs]
 
@@ -75,9 +76,12 @@ class Projects::MergeRequestsController < Projects::ApplicationController
     respond_to do |format|
       format.html do
         define_discussion_vars
+        define_show_vars
       end
 
       format.json do
+        Gitlab::PollingInterval.set_header(response, interval: 10_000)
+
         render json: serializer.represent(@merge_request, basic: params[:basic])
       end
 
@@ -309,12 +313,6 @@ class Projects::MergeRequestsController < Projects::ApplicationController
     render json: serializer.represent(@merge_request)
   end
 
-  def merge_check
-    @merge_request.check_if_can_be_merged
-
-    render json: serializer.represent(@merge_request)
-  end
-
   def commit_change_content
     render partial: 'projects/merge_requests/widget/commit_change_content', layout: false
   end
@@ -640,6 +638,10 @@ class Projects::MergeRequestsController < Projects::ApplicationController
 
   private
 
+  def check_if_can_be_merged
+    @merge_request.check_if_can_be_merged
+  end
+
   def merge!
     # Disable the CI check if merge_when_pipeline_succeeds is enabled since we have
     # to wait until CI completes to know