code: function(req) {
      let Model     = module.exports.parseModel(req);
      let alias     = module.exports.parseAlias(req);
      let attribute = Model.attributes[alias];
  
      return (attribute) ? pluralize(attribute.model || attribute.collection) : false;
    }
docs: Parse relationship alias model name for use in a Waterline criteria
  (e.g. for `populate`)
  
  @param  {Request} req
  @return {String}