Programmatic default value for Sequelize model

Question

How can I create a default value that is generated programmatically upon creation of a new instance of a Sequelize model? I've read how to do this somewhere, but can't find it anywhere. I thought this had something to do with classMethods, but I can't figure out what that method should be called.

For example:

sequelize.define('Account', {
  name: DataTypes.STRING
}, {
  classMethods: {
    something: function (instance) {
      instance.name = 'account12345';
    }
  }
});

models.account.create(function (account) {
  console.log(account.name); // Echos "account12345" or whatever I
});

If you could point me in the right direction, it would be greatly appreciated.

cattail · Accepted Answer · 2017-02-19 03:40:29Z

24

You can just define defaultValue as function, sequelizejs explained in http://docs.sequelizejs.com/en/v3/api/datatypes/, the example code is

sequelize.define('model', {
  uuid: {
    type: DataTypes.UUID,
    defaultValue: function() {
      return generateMyId()
    },
    primaryKey: true
  }
})

However, you can't get the instance because before the defaultValue generated we don't have the instance.

answered Feb 19, 2017 at 3:40

cattail

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2 Comments

cattail Over a year ago

@MuhammadUmer you have to make sure it's unique by yourself.

thisisdee Over a year ago

@cattail How about if I'm adding a column, therefore the instance is already available. Can I get set the value of a different column as the defaultValue?

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