Add a new array in a nested document [duplicate] - node.js

Question

I want add new data my nested array
My document is:
{
"username": "erkin",
"email": "erkin-07#hotmail.com",
"password": "b",
"playlists": [
{
"_id": 58,
"name": "asdsa",
"date": "09-01-15",
"musics": [
{
"name": "INNA - Cola Song (feat. J Balvin)",
"duration": "3.00"
},
{
"name": "blabla",
"duration": "3.00"
}
]
}
]
}
I want add music in this playlist section:
{
"username": "erkin",
"email": "erkin-07#hotmail.com",
"password": "b",
"playlists": [
{
"_id": 58,
"name": "asdsa",
"date": "09-01-15",
"musics": [
{
"name": "INNA - Cola Song (feat. J Balvin)",
"duration": "3.00"
},
{
"name": "blabla",
"duration": "3.00"
},
{
"name": "new",
"duration": "3.00"
}
]
}
]
}
Here is what I tried:
$users->update(
array(
'_id' => new MongoId (Session::get('id')),
'playlists._id' => $playlistId
),
array(
'$push' => array('playlists.musics' => array(
'name' => 'newrecord',
'duration' => '3.00'
))
)
);

Answer 1

Probably something like this where ID is your ObjectId. The first {} are necessary to identify your document. It is not required to use an ObjectId as long as you have another unique identifier in your collection.
db.collection.update(
{ "_id": ID, "playlists._id": "58"},
{ "$push":
{"playlists.$.musics":
{
"name": "test name",
"duration": "4.00"
}
}
}
)

Answer 2

This way it worked for me!
"playlists.$[].musics":
db.collection.update(
{ "_id": ID, "playlists._id": "58"},
{ "$push":
{"playlists.$[].musics":
{
"name": "test name",
"duration": "4.00"
}
}
}
)
https://docs.mongodb.com/manual/reference/operator/update/positional-filtered/#position-nested-arrays-filtered

Answer 3

I suggest you using arrayFilters since it supports multiple nested documents and clearer.
db.collection.update(
{ "_id": ID},
{ "$push":
{"playlists.$[i].musics":
{
"name": "test name",
"duration": "4.00"
}
}
},
{
arrayFilters: [
{'i._id': 58,},
],
},
)

Answer 4

2022 update:
Full snippet:
from pymongo import MongoClient
client = MongoClient('mongodb://localhost:27017/', maxPoolSize=50)
db = client.name_of_db
collection = db["name_of_collection"]
To push:
collection.find_one_and_update(
{"_id": 'id_of_the_document'},
{"$push": {"key":"value"}})
To push into nested:
collection.find_one_and_update(
{"_id": 'id_of_the_document'},
{"$push": {"key.nested_key":"value"}})