code: function(req, model) {
  
      var values = req.body.data.attributes || {};
  
      if (req.allParams()['id']) {
        values[model.primaryKey] = req.allParams()['id'];
      }
  
      return values;
    }
docs: Parse `values` for a Waterline `create` or `update` from all
  request parameters.
  
  @param  {Request} req
  @return {Object}