From b807a7d731f390bce7cbe165b78200f4a0acc073 Mon Sep 17 00:00:00 2001
From: James Lopez <james@jameslopez.es>
Date: Fri, 2 Feb 2018 12:02:31 +0100
Subject: [PATCH] add migration

---
 ...02111106_remove_project_labels_group_id.rb | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 db/post_migrate/20180202111106_remove_project_labels_group_id.rb

diff --git a/db/post_migrate/20180202111106_remove_project_labels_group_id.rb b/db/post_migrate/20180202111106_remove_project_labels_group_id.rb
new file mode 100644
index 00000000000..db7fd0d167d
--- /dev/null
+++ b/db/post_migrate/20180202111106_remove_project_labels_group_id.rb
@@ -0,0 +1,19 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class RemoveProjectLabelsGroupId < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    update_column_in_batches(:labels, :group_id, nil) do |table, query|
+      query.where(table[:type].eq('ProjectLabel').and(table[:group_id].not_eq(nil)))
+    end
+  end
+
+  def down
+  end
+end