How to delete associated rows with sequelize - node.js

Question

I am trying to delete rows associated with a row in a table, without deleting the main row (thus can't use CASCADE).
This is the raw PostgreSQL query that does what I want to achieve with SQL. Is sequelize able to generate such query:
DELETE FROM session USING user WHERE session.user_id = user.id AND user.username = 'bob'
The model is (not including irrelevant columns):
create table user (
id uuid primary key default uuid_generate_v4(),
username text UNIQUE NOT NULL
);
create table session (
id uuid primary key default uuid_generate_v4(),
user_id uuid NOT NULL references user(id) ON DELETE CASCADE
);
The association is defined in sequelize as:
Session.belongsTo(models.User, {
foreignKey: "user_id"
});
User.hasMany(models.Session, {
foreignKey: "user_id"
});
An alternative version of the query could be:
DELETE FROM session WHERE session.user_id = (SELECT user_id FROM user WHERE username = 'bob');
But I think sequelize doesn't handle subqueries yet?
I tried something along the lines:
return Session.destroy({
include: [
{ model: User, where: { username: 'bob' }}
],
truncate: false
});
However, sequelize complains:
Error: Missing where or truncate attribute in the options parameter of model.destroy.

Answer 1

If anyone gets here, this is how I "delete associated rows with sequelize": little help from the library:
Read the user from db (Users.findOne({ ... }))
call the method setSessions(array) provided by sequelize (the name depends on your model) which returns a promise.
/** #param {string} username */
const clearUserSessions = async (username) {
const userInstance = await Users.findOne({
where: { username },
include: ['sessions']
})
if (!userInstance) {
/* user not found */
return ...
}
await userInstance.setSessions([])
/* removed every session from user */
return ...
};
later:
try {
await clearUserSessions('bob')
} catch(err) {
...
}

Answer 2

return Session.destroy({
where: {
'$users.username$': 'bob'
},
include: [{
model: User,
as: 'users'
}],
});
Hope that helps. Try to reach me with comment.