import { isEmpty } from '@ember/utils';

// Derives a stable grouping key for a contribution, so that contributions
// created for the same issue/pull request (one per contributor) can be
// linked together in the UI.
//
// Until we have identical IPFS documents for different contributions, we will
// use the URL as grouping key

export default function contributionGroupingKey (contribution) {
  let url = contribution ? contribution.url : null;
  if (isEmpty(url)) return null;
  return url;
}