Mongojs - how to push to array?

Question

I have the following code:

db.users.save({ username: "admin", array: [{ foo1: "foo1", foo2: "foo2" }, { bar1: "bar1", bar2: "bar2" }, { cell1: "cell1", cell2: "cell2" } ] });

Now I want to update the array. I mean to push something into the array:

db.users.update({ username: admin }, { $set: { array: { push1: "push1", push2: "push2" } }, function (err, updated) {

The update function doesn't push. So how can I push to the array, so the result will be:

[ { foo1:"foo1", foo2:"foo2" }, { bar1:"bar1", bar2:"bar2" }, { cell1:"cell1", cell2:"cell2" }, { push1:"push1", push2:"push2" } ]

gustavohenke · Accepted Answer · 2013-05-26 16:14:00Z

The $set operator will, of course, change the whole data of the array property.

If you want to just push, use $push (which pushes one item at once) or $pushAll (which pushes all items of an array).
If you want to push without repeating an item, use $addToSet.

Note: If you're on MongoDB 2.4 (the latest version), use $push with the new $each modifier. This deprecates usage of $pushAll (this applies to $addToSet, too)

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