Sequelize Example with Users and Tasks

user_task_association_example.js

var User = sequelize.define('User')
  , Task = sequelize.define('Task');
  
User.Tasks = User.hasMany(Task);
Task.User = Task.belongsTo(User);

/*
 * Creation
 */
User.create({ /* user values */ }).then(function (user) {
  return Task.create(({ /* task values */ }).then(function (task) {
    return user.addTask(task);
  });
  // or
  return user.createTask(({ /* task values */ });
});

User.create({
  /* user values */
  tasks: [
    {/* task values */},
    {/* task values */}
  ]
}, {
  include: [User.Tasks]
});

/*
 * Fetching
 */
 
User.findOne().then(function (user) {
  return user.getTasks().then(function (tasks) {
    
  });
});

User.findAll({
  include: [User.Tasks]
}).then(function (users) {
  users.forEach(function (user) {
    user.get('task');
  });
});

What is not clear from this example is what is returned from either user.addTask or user.createTask

@mschipperheyn This example is 4 years old, not sure it's completely up-to-date as i no longer maintain sequelize, IIRC createTask should return the new task atleast. You'll probably have to look at the source code or the API documentation.