Sequelize saving many to many - node.js

Question

I was wandering if there are any extended tutorials on how to save a many to many relationship? I find the documentation more than basic. Its missing many use case examples.
I have two models: Client and Rule. They have the n:n relationship.
Client:
var Client = sequelize.define('client', {
title: {
type: DataTypes.STRING(200),
allowNull: false
},
company: {
type: DataTypes.STRING(200),
allowNull: false
},
vendor: {
type: DataTypes.BOOLEAN,
allowNull: false,
defaultValue: false
},
consumer: {
type: DataTypes.BOOLEAN,
allowNull: false,
defaultValue: true
},
address_id: {
type: DataTypes.INTEGER,
allowNull: true
}
},{
paranoid: true,
underscored: true,
classMethods: {
associate:function(models){
Client.hasMany(models.rule, { through: 'client_rules', onDelete: 'cascade'});
}
}
});
Rule:
var Rule = sequelize.define('rule', {
service_id: {
type: DataTypes.INTEGER,
allowNull: false
},
is_allowed: {
type: DataTypes.BOOLEAN,
defaultValue: false
},
valid_until: {
type: DataTypes.DATE,
allowNull: true,
},
rule: {
type: DataTypes.TEXT,
allowNull: true
},
type: {
type: DataTypes.INTEGER, // 1 for company rule, 2 for individual rule
allowNull: false,
},
active: {
type: DataTypes.BOOLEAN,
defaultValue: true
}
},{
underscored: true,
paranoid: true,
classMethods: {
associate:function(models){
Rule.belongsToMany(models.client, { through: 'client_rules', onDelete: 'cascade'});
Rule.belongsTo(models.service, { foreignKey: 'service_id' } );
}
}
});
Now I would like to create a new rule for client. So I would have to create the rule first and associate it then to the client through 'client_rules'.
How do I do that with sequelize? This doesn't work:
var clientID = req.user.client_id;
Client.find({ id: clientID })
.then(function(client){
return client.addRule(req.body)
})
.catch(function(err){
console.log(err)
})
[TypeError: Cannot read property 'replace' of undefined]

Answer 1

Ok I found out how to do it. The docs are very confusing.
var clientID = req.user.client_id;
return Rule.create(req.body)
.then(function(newRule){
var ruleToAdd = newRule;
return Client.findOne({ where: { id: clientID } })
.then(function(client){
return client.addRule(ruleToAdd)
.then(function(ans){
return ruleToAdd;
})
})