User.belongsToMany(House, { through: UserHouse });
House.belongsToMany(User, { through: UserHouse });
user.addHouse(house);
house.setUsers([user1, user2])
http://docs.sequelizejs.com/ en / latest / docs / associations /＃belongs-to-many-associations http://docs.sequelizejs.com/en/ latest / api /associations / belongs-to-many /