Split huge method MergeRequests::UpdateService#execute

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/services/merge_requests/update_service.rb

@@ -35,35 +35,38 @@ module MergeRequests
           )
         end
 
-        if merge_request.previous_changes.include?('target_branch')
-          create_branch_change_note(merge_request, 'target',
-                                    merge_request.previous_changes['target_branch'].first,
-                                    merge_request.target_branch)
-        end
+        handle_changes(merge_request)
+        merge_request.create_new_cross_references!(current_user)
+        execute_hooks(merge_request, 'update')
+      end
 
-        if merge_request.previous_changes.include?('milestone_id')
-          create_milestone_note(merge_request)
-        end
+      merge_request
+    end
 
-        if merge_request.previous_changes.include?('assignee_id')
-          create_assignee_note(merge_request)
-          notification_service.reassigned_merge_request(merge_request, current_user)
-        end
+    def handle_changes(merge_request)
+      if merge_request.previous_changes.include?('target_branch')
+        create_branch_change_note(merge_request, 'target',
+                                  merge_request.previous_changes['target_branch'].first,
+                                  merge_request.target_branch)
+      end
 
-        if merge_request.previous_changes.include?('title')
-          create_title_change_note(merge_request, merge_request.previous_changes['title'].first)
-        end
+      if merge_request.previous_changes.include?('milestone_id')
+        create_milestone_note(merge_request)
+      end
 
-        if merge_request.previous_changes.include?('target_branch') ||
-            merge_request.previous_changes.include?('source_branch')
-          merge_request.mark_as_unchecked
-        end
+      if merge_request.previous_changes.include?('assignee_id')
+        create_assignee_note(merge_request)
+        notification_service.reassigned_merge_request(merge_request, current_user)
+      end
 
-        merge_request.create_new_cross_references!(current_user)
-        execute_hooks(merge_request, 'update')
+      if merge_request.previous_changes.include?('title')
+        create_title_change_note(merge_request, merge_request.previous_changes['title'].first)
       end
 
-      merge_request
+      if merge_request.previous_changes.include?('target_branch') ||
+          merge_request.previous_changes.include?('source_branch')
+        merge_request.mark_as_unchecked
+      end
     end
   end
 end