1 files changed, 19 insertions, 0 deletions
diff --git a/db/migrate/20200423081409_add_constraint_to_resource_state_events_must_belong_to_issue_or_merge_request.rb b/db/migrate/20200423081409_add_constraint_to_resource_state_events_must_belong_to_issue_or_merge_request.rb
new file mode 100644
index 00000000000..57df1045e2c
--- /dev/null
+++ b/db/migrate/20200423081409_add_constraint_to_resource_state_events_must_belong_to_issue_or_merge_request.rb
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+class AddConstraintToResourceStateEventsMustBelongToIssueOrMergeRequest < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  CONSTRAINT_NAME = 'resource_state_events_must_belong_to_issue_or_merge_request'
+
+  def up
+    add_check_constraint :resource_state_events, '(issue_id != NULL AND merge_request_id IS NULL) OR (merge_request_id != NULL AND issue_id IS NULL)', CONSTRAINT_NAME
+  end
+
+  def down
+    remove_check_constraint :resource_state_events, CONSTRAINT_NAME
+  end
+end