Send update instructions after project namespace id changed or namespace path changed

app/models/namespace.rb

@@ -59,7 +59,10 @@ class Namespace < ActiveRecord::Base
       if File.exists?(new_path)
         raise "Already exists"
       end
-      system("mv #{old_path} #{new_path}")
+
+      if system("mv #{old_path} #{new_path}")
+        send_update_instructions
+      end
     end
   end
 
@@ -67,4 +70,8 @@ class Namespace < ActiveRecord::Base
     dir_path = File.join(Gitlab.config.gitolite.repos_path, path)
     system("rm -rf #{dir_path}")
   end
+
+  def send_update_instructions
+    projects.each(&:send_move_instructions)
+  end
 end

app/models/project.rb

@@ -259,4 +259,10 @@ class Project < ActiveRecord::Base
       merge_requests
     end
   end
+
+  def send_move_instructions
+    self.users_projects.each do |member|
+      Notify.project_was_moved_email(member.id).deliver
+    end
+  end
 end