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Lifecycle callbacks

Overview

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Lifecycle callbacks are functions that are automagically called before or after certain model actions. For example, we sometimes use lifecycle callbacks to automatically hash a password before creating or updating an Account model.

Sails exposes a handful of lifecycle callbacks by default.

Callbacks on create
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Callbacks on update
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Callbacks on destroy
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Example

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If you want to hash a password before saving in the database, you might use the beforeCreate lifecycle callback.

var bcrypt = require('bcrypt');

module.exports = {

  attributes: {

    username: {
      type: 'string',
      required: true
    },

    password: {
      type: 'string',
      minLength: 6,
      required: true,
      columnName: 'hashed_password'
    }

  },


  // Lifecycle Callbacks
  beforeCreate: function (values, cb) {

    // Hash password
    bcrypt.hash(values.password, 10, function(err, hash) {
      if(err) return cb(err);
      values.password = hash;
      //calling cb() with an argument returns an error. Useful for canceling the entire operation if some criteria fails.
      cb();
    });
  }
};

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