Fix MR widget url

app/helpers/merge_requests_helper.rb

@@ -20,8 +20,8 @@ module MergeRequestsHelper
   end
 
   def mr_widget_refresh_url(mr)
-    if mr && mr.source_project
-      merge_widget_refresh_namespace_project_merge_request_url(mr.source_project.namespace, mr.source_project, mr)
+    if mr && mr.target_project
+      merge_widget_refresh_namespace_project_merge_request_url(mr.target_project.namespace, mr.target_project, mr)
     else
       ''
     end

changelogs/unreleased/27632_fix_mr_widget_url.yml

+---
+title: Fix MR widget url
+merge_request: 8989
+author:

spec/helpers/merge_requests_helper_spec.rb

@@ -63,9 +63,11 @@ describe MergeRequestsHelper do
     end
   end
 
-  describe 'mr_widget_refresh_url' do
-    let(:project)       { create(:empty_project) }
-    let(:merge_request) { create(:merge_request, source_project: project) }
+  describe '#mr_widget_refresh_url' do
+    let(:guest)         { create(:user) }
+    let(:project)       { create(:project, :public) }
+    let(:project_fork)  { Projects::ForkService.new(project, guest).execute }
+    let(:merge_request) { create(:merge_request, source_project: project_fork, target_project: project) }
 
     it 'returns correct url for MR' do
       expected_url = "#{project.path_with_namespace}/merge_requests/#{merge_request.iid}/merge_widget_refresh"
@@ -74,7 +76,7 @@ describe MergeRequestsHelper do
     end
 
     it 'returns empty string for nil' do
-      expect(mr_widget_refresh_url(nil)).to end_with('')
+      expect(mr_widget_refresh_url(nil)).to eq('')
     end
   end
 end