node.js - Set default value to a model(Sails.js) -

i starting learn sails.js , want know if there simpler way set default value in model session variable? using waterlock authentication , setting user_id in session variable req.session.user_id. have message model, want default 'from' field session variable. there way in sails.js?

if using sail's default orm, waterline, model attributes have defaultsto option. supplied value may function. can @ waterline documentation.

sample model

module.exports = {   attributes: {     description: {       type: 'string',       defaultsto: 'no description.'     },     email: {       type: 'email',       required: true,       unique: true     },     alias: {       type: 'string',       defaultsto: function(){         return this.email;       }     },   } }; 

if supplied value function, call function bound values in create.

for model.create(values)..., if alias null/undefined, alias = defaultsto.call(values) used value alias.

so use req.session.user_id may have include during create. model.create({session: req.session,...}). not sure, since not use waterlock. , i'm not don't think best way go it.

from experience these values ignored when using adapters such sails-mysql, if using sails-disk development, might see these values persisted. may want delete them before persist.

  beforecreate: function(values, cb){     delete values['session'];     cb();   }