1 files changed, 32 insertions, 0 deletions
diff --git a/db/migrate/20200330203826_drop_fk_in_ci_ref.rb b/db/migrate/20200330203826_drop_fk_in_ci_ref.rb
new file mode 100644
index 00000000000..08cb4aaddab
--- /dev/null
+++ b/db/migrate/20200330203826_drop_fk_in_ci_ref.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+class DropFkInCiRef < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    with_lock_retries do
+      remove_foreign_key_if_exists :ci_refs, column: :project_id
+    end
+    with_lock_retries do
+      remove_foreign_key_if_exists :ci_refs, column: :last_updated_by_pipeline_id
+    end
+  end
+
+  def down
+    add_foreign_key_if_not_exists :ci_refs, :projects, column: :project_id, on_delete: :cascade
+    add_foreign_key_if_not_exists :ci_refs, :ci_pipelines, column: :last_updated_by_pipeline_id, on_delete: :nullify
+  end
+
+  private
+
+  def add_foreign_key_if_not_exists(source, target, column:, on_delete:)
+    return unless table_exists?(source)
+    return if foreign_key_exists?(source, target, column: column)
+
+    add_concurrent_foreign_key(source, target, column: column, on_delete: on_delete)
+  end
+end