1 files changed, 42 insertions, 0 deletions
diff --git a/app/services/projects/move_forks_service.rb b/app/services/projects/move_forks_service.rb
new file mode 100644
index 00000000000..d2901ea1457
--- /dev/null
+++ b/app/services/projects/move_forks_service.rb
@@ -0,0 +1,42 @@
+module Projects
+  class MoveForksService < BaseMoveRelationsService
+    def execute(source_project, remove_remaining_elements: true)
+      return unless super && source_project.fork_network
+
+      Project.transaction(requires_new: true) do
+        move_forked_project_links
+        move_fork_network_members
+        update_root_project
+        refresh_forks_count
+
+        success
+      end
+    end
+
+    private
+
+    def move_forked_project_links
+      # Update ancestor
+      ForkedProjectLink.where(forked_to_project: source_project)
+                       .update_all(forked_to_project_id: @project.id)
+
+      # Update the descendants
+      ForkedProjectLink.where(forked_from_project: source_project)
+                       .update_all(forked_from_project_id: @project.id)
+    end
+
+    def move_fork_network_members
+      ForkNetworkMember.where(project: source_project).update_all(project_id: @project.id)
+      ForkNetworkMember.where(forked_from_project: source_project).update_all(forked_from_project_id: @project.id)
+    end
+
+    def update_root_project
+      # Update root network project
+      ForkNetwork.where(root_project: source_project).update_all(root_project_id: @project.id)
+    end
+
+    def refresh_forks_count
+      Projects::ForksCountService.new(@project).refresh_cache
+    end
+  end
+end