Use MR#source_project_path method instead of merge_request.source_project.path_with_namespace

app/helpers/merge_requests_helper.rb

@@ -36,7 +36,7 @@ module MergeRequestsHelper
 
   def merge_path_description(merge_request, separator)
     if merge_request.for_fork?
-      "Project:Branches: #{@merge_request.source_project.path_with_namespace}:#{@merge_request.source_branch} #{separator} #{@merge_request.target_project.path_with_namespace}:#{@merge_request.target_branch}"
+      "Project:Branches: #{@merge_request.source_project_path}:#{@merge_request.source_branch} #{separator} #{@merge_request.target_project.path_with_namespace}:#{@merge_request.target_branch}"
     else
       "Branches: #{@merge_request.source_branch} #{separator} #{@merge_request.target_branch}"
     end

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

@@ -10,7 +10,7 @@
       .span5
         .clearfix
           .pull-left
-            = f.select(:source_project_id,[[@merge_request.source_project.path_with_namespace,@merge_request.source_project.id]] , {}, {class: 'source_project chosen span3'})
+            = f.select(:source_project_id,[[@merge_request.source_project_path,@merge_request.source_project.id]] , {}, {class: 'source_project chosen span3'})
           .pull-left
              
             = f.select(:source_branch, @merge_request.source_project.repository.branch_names, { include_blank: "Select branch" }, {class: 'source_branch chosen span2'})

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

@@ -10,7 +10,7 @@
       %span.pull-right
         - if merge_request.for_fork?
           %span.light
-            = "#{merge_request.source_project.path_with_namespace}"
+            = "#{merge_request.source_project_path}"
           = "#{merge_request.source_branch}"
           %i.icon-angle-right.light
           = "#{merge_request.target_branch}"

app/views/projects/merge_requests/show/_how_to_merge.html.haml

@@ -10,7 +10,7 @@
         %strong Step 1.
         Checkout target branch and get recent objects from GitLab
         Assuming remote for  #{@merge_request.target_project.path_with_namespace} is called #{target_remote}
-        remote for  #{@merge_request.source_project.path_with_namespace} is called #{source_remote}
+        remote for  #{@merge_request.source_project_path} is called #{source_remote}
       %pre.dark
         :preserve
           git checkout #{target_remote} #{@merge_request.target_branch}

app/views/projects/merge_requests/show/_mr_title.html.haml

@@ -3,7 +3,7 @@
    
   -if @merge_request.for_fork?
     %span.label-branch
-      %span.label-project= truncate(@merge_request.source_project.path_with_namespace, length: 25)
+      %span.label-project= truncate(@merge_request.source_project_path, length: 25)
       #{@merge_request.source_branch}
     →
     %span.label-branch= @merge_request.target_branch