code: function(association, name) {
      var context = this._relationCallContext;
      var through = association.indexOf('.') !== -1 ?
        util.format(' through %s', association) : '';
      return _.extend(new Error(util.format(
        'No relation %j found for `%s` on %s query%s.',
        name, context, this._model.__identity__.__name__, through)), {
        code: 'RELATION_ITERATION_FAILURE',
      });
  
    }
docs: Create an error for a missing relation during relation iteration.
  
  @param {String} association Relation key path.
  @param {String} name The name that caused the error.
  @return {Error} The error object.