How to query many to many relationship sequelize?

Question

Tables have many to many relationship, junction by an order table in between.

Outlet --> Order <-- Product

I want to get the list of Outlet for today Order.

So here is a function to get all outlets:

db.Outlet.findAll({include: [
    {model:db.Product, attributes: ['id', 'name', 'nameKh']}
    ]}).then(function(outlets){
    return res.jsonp(outlets);
})

I got this result:

I can only select with where Product Id by using this:

db.Outlet.findAll({include: [
    {model:db.Product, attributes: ['id', 'name', 'nameKh'], where: {id: 2}
    ]}).then(function(outlets){
    return res.jsonp(outlets);
})

How can I query by specific order amount, or today order date?

Here are my models:

Outlet:

var Outlet = sequelize.define('Outlet', {
            outletCode: DataTypes.STRING,
            outletName: DataTypes.STRING,
            outletNameKh: DataTypes.STRING,
            outletSubtype: DataTypes.STRING,
            perfectStoreType: DataTypes.STRING,
            address: DataTypes.STRING
        },
        {
            associate: function(models){
                Outlet.belongsToMany(models.Product, {through: models.Order});
                Outlet.belongsTo(models.Distributor);
                // Outlet.hasMany(models.Order);
            }
        }
    );

Product:

var Product = sequelize.define('Product', {
            inventoryCode: DataTypes.STRING,
            name: DataTypes.STRING,
            nameKh: DataTypes.STRING,
            monthlyCaseTarget: DataTypes.INTEGER,
            pieces: DataTypes.INTEGER,
            star: DataTypes.BOOLEAN,
            price: DataTypes.FLOAT,
            active: DataTypes.BOOLEAN
        },
        {
            associate: function(models){
                Product.belongsToMany(models.Outlet, {through: models.Order});
                Product.belongsTo(models.Category);
                // Product.hasMany(models.Order);
            }
        }
    );

Order:

var Order = sequelize.define('Order', {
            id: {
                type: DataTypes.INTEGER,
                primaryKey: true,
                autoIncrement: true
            },
            amount: DataTypes.INTEGER
        },
        {
            associate: function(models){
                Order.belongsTo(models.Outlet);
                Order.belongsTo(models.Product);
                Order.belongsTo(models.User);
            }
        }
    );

Answer 1

Try it:

db.Outlet.findAll({
    include: [{
        model:db.Product, 
        attributes: ['id', 'name', 'nameKh'], 
        through: { where: { amount: 10 } }
    }]
})