Unlink a project from a fork network when it's source was deleted.

We need to close all merge requests coming from the project within the
entire fork network.

2 files changed, 15 insertions, 5 deletions

diff --git a/app/models/fork_network.rb b/app/models/fork_network.rb
index 218e37a5312..7f1728e8c77 100644
--- a/app/models/fork_network.rb
+++ b/app/models/fork_network.rb
@@ -12,4 +12,8 @@ class ForkNetwork < ActiveRecord::Base
   def find_forks_in(other_projects)
     projects.where(id: other_projects)
   end
+
+  def merge_requests
+    MergeRequest.where(target_project: projects)
+  end
 end
diff --git a/app/services/projects/unlink_fork_service.rb b/app/services/projects/unlink_fork_service.rb
index 2b82e5732e4..c499f384426 100644
--- a/app/services/projects/unlink_fork_service.rb
+++ b/app/services/projects/unlink_fork_service.rb
@@ -3,18 +3,24 @@ module Projects
     def execute
       return unless @project.forked?
 
-      @project.forked_from_project.lfs_objects.find_each do |lfs_object|
-        lfs_object.projects << @project
+      if fork_source = @project.fork_source
+        fork_source.lfs_objects.find_each do |lfs_object|
+          lfs_object.projects << @project
+        end
+
+        refresh_forks_count(fork_source)
       end
 
-      merge_requests = @project.forked_from_project.merge_requests.opened.from_project(@project)
+      merge_requests = @project.fork_network
+                         .merge_requests
+                         .opened
+                         .where.not(target_project: @project)
+                         .from_project(@project)
 
       merge_requests.each do |mr|
         ::MergeRequests::CloseService.new(@project, @current_user).execute(mr)
       end
 
-      refresh_forks_count(@project.forked_from_project)
-
       @project.fork_network_member.destroy
       @project.forked_project_link.destroy
     end