sequelize example "enforcing a foreign key reference" -- trying to get to work

package.json

{
  "dependencies": {
    "sequelize": "~2.0.0-beta.1",
    "sqlite3": "~2.1.19"
  }
}

reference.js

var Sequelize = require('sequelize')
  , DataTypes = Sequelize
;

options = {
  dialect: "sqlite"
  , storage: "rssmtp_dev.sqlite"
};

var sequelize = new Sequelize('database', 'username', 'password', options);


var Series, Trainer, Video

// Series has a trainer_id=Trainer.id foreign reference key after we call Trainer.hasMany(series)
Series = sequelize.define('Series', {
  title:        DataTypes.STRING,
  sub_title:    DataTypes.STRING,
  description:  DataTypes.TEXT,

  // Set FK relationship (hasMany) with `Trainer`
  trainer_id: {
    type: DataTypes.INTEGER,
    references: "Trainers",
    referencesKey: "id"
  }
})

Trainer = sequelize.define('Trainer', {
  first_name: DataTypes.STRING,
  last_name:  DataTypes.STRING
});

// Video has a series_id=Series.id foreign reference key after we call Series.hasOne(Video)...
Video = sequelize.define('Video', {
  title:        DataTypes.STRING,
  sequence:     DataTypes.INTEGER,
  description:  DataTypes.TEXT,

  // set relationship (hasOne) with `Series`
  series_id: {
    type: DataTypes.INTEGER,
    references: "Serieses",
    referencesKey: "id"
  }
});

Series.hasOne(Video, {foreignKeyConstraint: true});
Trainer.hasMany(Series, {foreignKeyConstraint: true});

sequelize.sync({force: true}).done(function(err) {
  console.log("SYNC ERR: ", err);

  Series.create({ title: "waffles" }).done(function(err, series){
    // this ought to fail due to a missing trainer_id
    console.log("CREATE ERR: ", err);
  });
});