sequelize validation problem

example.coffee

Sequelize = require 'sequelize'
sequelize = new Sequelize 'sequelize-test', 'postgres', 'changeme123',
    host: 'localhost'
    port: 5432
    dialect: 'postgres'

A = sequelize.define 'a', name: Sequelize.STRING
B = sequelize.define 'b',
    name:
        type: Sequelize.STRING
        validate:
            notEmpty: true

A.hasMany B

sequelize.sync().success ->
    chainer = new Sequelize.Utils.QueryChainer [
        A.create name: 'a'
        B.create name: 'b'
    ]
    chainer.run().success (res, a, b) ->
        console.log a.dataValues
        console.log b.dataValues
        a.setBs([b]).success(->
            a.getBs().success (bs) ->
                console.log bs.map (i) -> i.dataValues
        ).error (err) ->
            console.log err