{"action":"opened","issue":{"url":"https://api.github.com/repos/openspending/osep/issues/21","labels_url":"https://api.github.com/repos/openspending/osep/issues/21/labels{/name}","comments_url":"https://api.github.com/repos/openspending/osep/issues/21/comments","events_url":"https://api.github.com/repos/openspending/osep/issues/21/events","html_url":"https://github.com/openspending/osep/issues/21","id":94084038,"number":21,"title":"Missing way of combining attributes in mapping, e.g. for foreign keys","user":{"login":"tryggvib","id":3489241,"avatar_url":"https://avatars.githubusercontent.com/u/3489241?v=3","gravatar_id":"","url":"https://api.github.com/users/tryggvib","html_url":"https://github.com/tryggvib","followers_url":"https://api.github.com/users/tryggvib/followers","following_url":"https://api.github.com/users/tryggvib/following{/other_user}","gists_url":"https://api.github.com/users/tryggvib/gists{/gist_id}","starred_url":"https://api.github.com/users/tryggvib/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tryggvib/subscriptions","organizations_url":"https://api.github.com/users/tryggvib/orgs","repos_url":"https://api.github.com/users/tryggvib/repos","events_url":"https://api.github.com/users/tryggvib/events{/privacy}","received_events_url":"https://api.github.com/users/tryggvib/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-07-09T15:46:38Z","updated_at":"2015-07-09T15:46:38Z","closed_at":null,"body":"We need a way to create a combined value, e.g. id. For example COFOG code is split across three fields (level1, level2 and level3). We should be able to combine those into one field level1.level2.level3."}}