Add default role to many-many relation in Sequelize.js - node.js

Question

I have two Sequelize.js models what are connected by many-to-many relation.
User:
module.exports = (sequelize, DataTypes) => {
const model = sequelize.define('User', {
email: {
type: DataTypes.STRING,
unique: true,
allowNull: false
},
password: {
type: DataTypes.CHAR,
length: 60,
allowNull: false
}
}
});
model.associate = models => {
model.belongsToMany(models.Role, {
hooks: true,
through: 'user_roles'
})
};
return model;
};
Role:
module.exports = (sequelize, DataTypes) => {
const model = sequelize.define('Role',
{
name: {
type: DataTypes.STRING,
unique: false,
allowNull: false
}
}
);
model.associate = models => {
model.belongsToMany(models.User, {
hooks: true,
through: 'user_roles'
});
};
return model;
};
Table user_roles is created automatically.
How to set default role what will be inserted into user_roles while creating new User? Is there way to define it in models definition or I am just supposed to create User new user and then create relation in one transaction?

Answer 1

First you need to create a model for the user_roles after creating that you have to set a hook inside your user model that will automatically insert roles in to your user_roles table.
This is how you can do it.
For Example :
User Model
const { hooks } = require('./user-role.hook');
module.exports = (sequelize, DataTypes) => {
const model = sequelize.define('User', {
email: {
type: DataTypes.STRING,
unique: true,
allowNull: false
},
password: {
type: DataTypes.CHAR,
length: 60,
allowNull: false
}
}, { hooks });
model.associate = models => {
model.belongsToMany(models.Role, {
hooks: true,
through: 'user_roles'
})
};
return model;
};
Hook file
exports.hooks = {
afterCreate: (User, payload) => {
AddUserRole(User, payload);
}
}
function AddUserRole(User, payload) {
let InsertArr = {
user_id: User._id,
role_id: 1 // pass default role id
}
model.UserRole.create(InsertArr);
}