sequelize association explanation on docs

Question

while reading sequelize doc association part, explanation below really confuses me

hasOne and belongsTo insert the association key in different models f

Answer 1

Actually it depends on how are you creating your tables. Via sync or via migrations.

For example

const User = sequelize.define('user', {
  username: Sequelize.STRING,
});

const Address = sequelize.define('add', {
  address: Sequelize.STRING,
});

User.hasOne(Address);

sequelize.sync({ force: true })
  .then(() => User.create({
    username: 'test'
  }))
  .then(item => {
    console.log(item.dataValues.itemPrice);
  });

This will create a userId field in the database

Note that I am use sync. However if you are using migrations, you would have to create this on your own.

PS: Its better to use migrations instead of sync.