Improve perfomance of removeing group

app/controllers/admin/groups_controller.rb

@@ -73,6 +73,8 @@ class Admin::GroupsController < AdminController
   end
 
   def destroy
+    @group.truncate_teams
+
     @group.destroy
 
     redirect_to admin_groups_path, notice: 'Group was successfully deleted.'

app/models/group.rb

@@ -29,4 +29,8 @@ class Group < Namespace
   def human_name
     name
   end
+
+  def truncate_teams
+    UsersProject.truncate_teams(project_ids)
+  end
 end

app/models/users_project.rb

@@ -56,6 +56,25 @@ class UsersProject < ActiveRecord::Base
       false
     end
 
+    def truncate_teams(project_ids)
+      UsersProject.transaction do
+        users_projects = UsersProject.where(project_id: project_ids)
+        users_projects.each do |users_project|
+          users_project.skip_git = true
+          users_project.destroy
+        end
+        Gitlab::Gitolite.new.update_repositories(Project.where(id: project_ids))
+      end
+
+      true
+    rescue
+      false
+    end
+
+    def truncate_team project
+      truncate_teams [project.id]
+    end
+
     def import_team(source_project, target_project)
       source_team = source_project.users_projects.all
       target_team = target_project.users_projects.all

app/roles/team.rb

@@ -47,7 +47,8 @@ module Team
     UsersProject.bulk_delete(self, users_ids)
   end
 
+  # Remove all users from project team
   def truncate_team
-    UsersProject.bulk_delete(self, self.users.map(&:id))
+    UsersProject.truncate_team(self)
   end
 end