Creo que puedes hacer:
db.Page.findAll({
include: [{
model: db.Gallery
include: [{
model: db.Artwork
}]
}],
order: [
// sort by the 'order' column in Gallery model, in descending order.
[ db.Gallery, 'order', 'DESC' ],
// then sort by the 'order' column in the nested Artwork model in a descending order.
// you need to specify the nested model's parent first.
// in this case, the parent model is Gallery, and the nested model is Artwork
[ db.Gallery, db.ArtWork, 'order', 'DESC' ]
]
})
También hay un montón de formas diferentes, o cosas que puede hacer al realizar el pedido. Lea más aquí:https://sequelize.org/master/manual/model-querying-basics.html#ordering-and-grouping