Removing elements from embedded array by matching with different array in mongoose

Question

i have an embedded array of tweets in my Mongodb and with every tweet comes a tweetID (not to be confused with the mongodb assigned id).

{
"_id": {
    "$oid": "54d95cb062917897ad26c5e5"
},
"name": "foo",
"tweets": [
    {
        "tweetID": "1234",
        "text": "bla bla bla"
    },
    {
        "tweetID": "4321",
        "text": "bla bla bla",
    }

... and so on

Now in my app I have another array full of tweetID's that should be deleted.

var tweetsToBeDeleted = [ "1234", "4321" ];

And i am trying to get mongoose to do so with:

ChannelsModel.update( { },
                      { $pull: { tweets: { $elemMatch: { tweetID: tweetsToBeDeleted } } } },
                      { multi: true },
                      function ( err ) {
                         console.log( "err - " + err );
                      } 
);

But when i try to run this, nothing gets deleted. The error callback will executed but err is null.

Any ideas?

Thanks in advance!

JohnnyHK · Accepted Answer · 2015-02-10 04:10:59Z

3

Use $in when matching a field to multiple values:

var tweetsToBeDeleted = [ "1234", "4321" ];
ChannelsModel.update( { },
                      { $pull: { tweets: { tweetID: { $in: tweetsToBeDeleted } } } },
                      { multi: true },
                      function ( err ) {
                         console.log( "err - " + err );
                      } 
);

answered Feb 10, 2015 at 4:10

JohnnyHK

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