where to find setRoles()?

[willow7777]

I've been trying to study the code but can't find the setRoles() function, as follows:

can you tell me where to find it?
User.create({ // INSERT
username: req.body.username,
email: req.body.email,
password: bcrypt.hashSync(req.body.password, 8)
})
.then(user => {
if (req.body.roles) {
Role.findAll({
where: {
name: {
[Op.or]: req.body.roles
}
}
}).then(roles => {
user.setRoles(roles).then(() => {
res.send({ message: "User registered successfully!" });
});
});
} else {
// user role = 1
user.setRoles([1]).then(() => {
res.send({ message: "User registered successfully!" });
});
}
})
.catch(err => {
res.status(500).send({ message: err.message });
});

[bparesh]

SetRoles is the builtin function provided by sequelize nodejs library https://sequelize.org/
it is defined by the relation between the tables.