Seqelize N:M with Join table update

Question

Currently I have a join table user_roles, user model and the role model, I want to update the role of a particular user after it's initially set.

user_roles - Join table between user and role

<code>db.user = require("../models/user.model.js")(sequelize, Sequelize);
db.role = require("../models/role.model.js")(sequelize, Sequelize);

db.role.belongsToMany(db.user, {
    through: "user_roles",
    foreignKey: "roleId",
    otherKey: "userId"
});
db.user.belongsToMany(db.role, {
    through: "user_roles",
    foreignKey: "userId",
    otherKey: "roleId"
});</code>

User model

<code>
module.exports = (sequelize, Sequelize) => {
    const User = sequelize.define("users", {
        username: {
            type: Sequelize.STRING
        },
        email: {
            type: Sequelize.STRING
        },
        password: {
            type: Sequelize.STRING
        },
        resetPasswordToken: Sequelize.STRING,
        resetPasswordExpires: Sequelize.STRING,
    }); 
    return User; }; </code>

Role Model

<code>module.exports = (sequelize, Sequelize) => {
  const Role = sequelize.define("roles", {
    id: {
      type: Sequelize.INTEGER,
      primaryKey: true
    },
    name: {
      type: Sequelize.STRING
    }
  });

  return Role;
};</code>

Answer 1

Since you have M:N relationship here and use belongsToMany then you can call setRole method of the User model instance to replace roles linked to a certain user by passing role ids there:

await user.setRoles([2])

To add new user roles to existing ones you can use addRole/addRoles. Please look at the official documentation here to see what special methods Sequelize adds to model instances dynamically in case of different types of associations.