Pull object from an array with node-mongodb-native

Question

I'm struggling with a simple operation with the mongodb native driver for nodejs. Here is my mongo document:

{
    "_id" : 1,
    "foo" : "bar",
    "baz" : [
         {
            "a" : "b",
            "c" : 1
         },
         {
            "a" : "b",
            "c" : 2
         }
    ]
}

and I have a var like the following :

var removeIt = {"a" : "b", "c" : 1};

So to pull this object from the baz array I try to do the following :

collection.update(
        {_id:1}, 
        {$pull:{baz:{a:removeIt.a, c:removeIt.c}}},
        {safe:true},
        function(err, result) {}
);

But this doesn't seem to work, and I cannot get why, any idea?

I would think you would need to use: {$pull:{baz:{ removeIt }}}, instead - did you try that? — Derick
– Derick, Commented Nov 12, 2012 at 15:06
Thans for your comment, but this throws an error, and {$pull:{baz: removeIt }} just do nothing like my implementation. — xavier.seignard
– xavier.seignard, Commented Nov 12, 2012 at 15:10

Derick · Accepted Answer · 2012-11-12 15:10:43Z

3

I've just tried this on the MongoShell, and the following works for me:

> db.test.insert( {
    "_id" : 1,
    "foo" : "bar",
    "baz" : [
         {
            "a" : "b",
            "c" : 1
         },
         {
            "a" : "b",
            "c" : 2
         }
    ]
});

> db.test.findOne();
{ "_id" : 1, "baz" : [ { "a" : "b", "c": 1 }, { "a" : "b", "c" : 2 } ], "foo" : "bar" }

> removeIt = {"a" : "b", "c" : 1};
> db.test.update( { _id: 1 }, { $pull: { baz: removeIt } } );

> db.test.findOne();
{ "_id" : 1, "baz" : [ { "a" : "b", "c" : 2 } ], "foo" : "bar" }

So modify your:

{$pull:{baz:{a:removeIt.a, c:removeIt.c}}}

to:

{$pull:{baz: removeIt}}

And it should work.

answered Nov 12, 2012 at 15:10

Derick

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1 Comment

xavier.seignard Over a year ago

Yes, it also works for me from the mongo shell, but not with the node-mongodb-native driver

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