1 files changed, 24 insertions, 0 deletions
diff --git a/db/migrate/20170508190732_add_foreign_key_to_ci_variables.rb b/db/migrate/20170508190732_add_foreign_key_to_ci_variables.rb
new file mode 100644
index 00000000000..20ecaa2c36c
--- /dev/null
+++ b/db/migrate/20170508190732_add_foreign_key_to_ci_variables.rb
@@ -0,0 +1,24 @@
+class AddForeignKeyToCiVariables < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    execute <<~SQL
+      DELETE FROM ci_variables
+      WHERE NOT EXISTS (
+        SELECT true
+        FROM projects
+        WHERE projects.id = ci_variables.project_id
+      )
+    SQL
+
+    add_concurrent_foreign_key(:ci_variables, :projects, column: :project_id)
+  end
+
+  def down
+    remove_foreign_key(:ci_variables, column: :project_id)
+  end
+end