Fix rendering pipelines for a new merge request

app/controllers/projects/merge_requests_controller.rb

@@ -227,9 +227,11 @@ class Projects::MergeRequestsController < Projects::ApplicationController
     respond_to do |format|
       format.html { define_new_vars }
       format.json do
-        render json: { pipelines: PipelineSerializer
+        define_pipelines_vars
+
+        render json: PipelineSerializer
           .new(project: @project, user: @current_user)
-          .represent(@pipelines) }
+          .represent(@pipelines)
       end
     end
   end

app/views/projects/merge_requests/_new_submit.html.haml

@@ -46,7 +46,7 @@
         -# This tab is always loaded via AJAX
       - if @pipelines.any?
         #pipelines.pipelines.tab-pane
-          = render "projects/merge_requests/show/pipelines", endpoint: link_to(url_for(params))
+          = render 'projects/merge_requests/show/pipelines', endpoint: request.fullpath
 
   .mr-loading-status
     = spinner