MongoDB update array in multiple nested document - mongodb

Question

I have a collections like the following
{
_id: 1
rooms:[{
_id: 1,
doors: [{
_id: 1,
name: 'kitchen',
color: 'green'
},{
_id:2,
name: 'bathroom',
color: 'red'
}]
}]
}
I want to update the whole content of specific door by id.
I try this code but it not work.
db.collections.update({_id:1, "rooms._id":1, "rooms.doors._id":2}, {$set: {rooms.$.doors.$: {_id:2, name: 'balcony', color:'yellow'}}}
If I use "rooms.$.doors.0", it will always update the first door in array.
db.collections.update({_id:1, "rooms._id":1, "rooms.doors._id":2}, {$set: {rooms.$.doors.0: {_id:2, name: 'balcony', color:'yellow'}}}
Anyone can help?.
Thank you for your looking.

Answer 1

you should try to avoid nesting multiple array like that. it's too troublesome if you wish to update. In previous version of mongodb, this guide still works, apparently not in latest version of mongodb. Just for fun, if you read the guide, imagine, how many $$ we need to update another nested array.
you can try aggregation, but I think it is easier to bring the the whole document with {_id:1} to server, replace the whole rooms_array and save it.
db.collections.find({_id:1}).exec((err, house)=>{
var rooms = house.rooms.map((r)=> {
return r.doors.map((d) => {
if(r._id === 1 && d._id === 2){
return {_id:2, name: 'balcony', color:'yellow'}
}
else{
return d
}
})
})
house.rooms = rooms
house.save()
})
alternative, perhaps you can do object reference for doors. Instead another document, just include ObjectId that refers to the doors. This door will be another new collection.