1 files changed, 20 insertions, 0 deletions
diff --git a/db/post_migrate/20200831074356_validate_not_null_constraint_on_mr_metrics.rb b/db/post_migrate/20200831074356_validate_not_null_constraint_on_mr_metrics.rb
new file mode 100644
index 00000000000..8fd54186db3
--- /dev/null
+++ b/db/post_migrate/20200831074356_validate_not_null_constraint_on_mr_metrics.rb
@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+class ValidateNotNullConstraintOnMrMetrics < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  TMP_INDEX_NAME = 'tmp_index_on_mr_metrics_target_project_id_null'
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    validate_not_null_constraint :merge_request_metrics, :target_project_id
+
+    remove_concurrent_index_by_name :merge_request_metrics, name: TMP_INDEX_NAME
+  end
+
+  def down
+    add_concurrent_index :merge_request_metrics, :id, where: 'target_project_id IS NULL', name: TMP_INDEX_NAME
+  end
+end