Custom validation of len not working.

What you are doing?

var Tag = sequelize.define("Tag", {
    name: {
      type: DataTypes.STRING,
      validate: {
        len: {
          args: [[0,32]],
          msg: 'Name too long.'
        }
      }
    }
  }
)

What do you expect to happen?

I’m expection an error message like

errors:
   [ { message: 'Name too long',
       type: 'Validation error',
       path: 'name',
       ...

What is actually happening?

No error is thrown. Nothing gets catched by Sequelize.ValidationError.

Without custom settings it works:

validate: {
        len: [0,32]
      }

throws a validation error.

sequelize: 3.24.3 node: 6.2.2 maria DB (Server version: 10.1.9-MariaDB Homebrew, Protocol version: 10)

[sushantdhiman]

@ro70 you have been passing arguments incorrectly to the args, it needs to be single array.

From Sequelize docs http://docs.sequelizejs.com/en/v3/docs/models-definition/#validations

Note that where multiple arguments need to be passed to the built-in validation functions, the arguments to be passed must be in an array. But if a single array argument is to be passed, for instance an array of acceptable strings for isIn, this will be interpreted as multiple string arguments instead of one array argument. To work around this pass a single-length array of arguments, such as [[‘one’, ‘two’]] as shown above.

SSCCE Test

var Tag = sequelize.define("Tag", {
  name: {
    type: Sequelize.STRING,
    validate: {
      len: {
        args: [0, 6],
        msg: 'Name too long.'
      }
    }
  }
});

sequelize
  .sync({ force: true })
  .then(() => Tag.create({ name: 'qwertyqwertyqwerty'}))
  .then((t) => console.log(t.toJSON()))
  .catch(console.error);

Output

Using database:  sequelize-test-39
{ SequelizeValidationError: Validation error: Name too long.
    at Promise.all.then (/var/www/github/sequelize/lib/instance-validator.js:76:15)
From previous event:
    at InstanceValidator._validate (/var/www/github/sequelize/lib/instance-validator.js:74:7)
    at modelInstance.constructor.runHooks.then (/var/www/github/sequelize/lib/instance-validator.js:95:16)
From previous event:
    at InstanceValidator.validate (/var/www/github/sequelize/lib/instance-validator.js:94:10)
    at model.validate (/var/www/github/sequelize/lib/model.js:3521:49)
    at Promise.try (/var/www/github/sequelize/lib/model.js:3321:21)
From previous event:
    at model.save (/var/www/github/sequelize/lib/model.js:3318:23)
    at Function.create (/var/www/github/sequelize/lib/model.js:1890:8)
    at sequelize.sync.then (/var/www/github/sequelize/sscce_template.js:26:19)
    at runCallback (timers.js:637:20)
    at tryOnImmediate (timers.js:610:5)
    at processImmediate [as _immediateCallback] (timers.js:582:5)

[ro70]

Here’s the code:

var Sequelize = require('sequelize')
var sequelize = new Sequelize('...', '...', '...')

var Tag = sequelize.define("Tag", {
    name: {
      type: Sequelize.STRING,
      validate: {
        len: { // <- Not throwing an error.
          args: [[0,32]],
          msg: 'Name too long.'
        }
        // len: [0, 32] // <- Throws 'SequelizeValidationError: Validation error: Validation len failed'
      }
    }
  }
)

// Creating values.
sequelize.sync({force: true})
.then(function() {
  return Tag.create(
    {
      name: '0123456789012345678901234567890123456789'
    }
  )
})

// Catching errors...
.catch(function(err) {
  console.log(err)
})