defered.

    fetch_meta: (scope, url, var_name)->
      deffered = $q.defer()
      # fetch a piece of data from the server, and store it into a scope variable
      $http.get(url).
      success((data, status, headers, config) ->
        svc.load_object_from_server(scope, data, var_name, true, deffered)).
      error((data, status, headers, config) ->
        svc.load_object_from_server(scope, data, var_name, false, deffered))

      deffered.promise