MongoDB - Update objects remove item in send array in object (nested updating)

Question

this is my mongodb object

{
    "_id" : ObjectId("4faaba123412d654fe83hg876"),
    "user_id" : 123456,
    "posters" : [ 123456,1111,456789,3333]
}

i want to add an item to posters array, or remove one how could i do it?

its nested updating.

i saw some question around stackoverflow, but i didnt found any answer how to remove object from the array, lets say 3333 there.

so the result will be:

{
    "_id" : ObjectId("4faaba123412d654fe83hg876"),
    "user_id" : 123456,
    "posters" : [ 123456,1111,456789]
}

Answer 1

Use$pull .

db.collection.update(
    { posters: "3333" },
    { $pull: { posters: "3333" } },
    { multi: true }
)

Answer 2

Use $push to add something into an array:

db.collection.update(
{ $push:
    {
        "posters" : "0000"
    }
}
)

Use $pull to remove something from an array:

db.collection.update(
{ $pull:
    {
        "posters" : "3333"
    }
}, True
)