Model.find, $and operator doesn't work with _id

$and operator doesn’t work with _id

When

 Model.find({_id: someId}, function () {...});

All works well, but if you do this

 Model.find({$and: [{_id: someId}]}, function () {...});

Document will not be found.

someId - is string, like: 4e9599df12049f440f001404

[zxcabs]

Okey, here another example:

here is schema:

new Schema({
    name: { type:String, default:'foo' }
});

I want check, is document with id containes name == ‘foo’.

for this, i do

TestModel.find({$and: [{_id: id}, {name: 'foo'}]}, function (err, doc){
    //
});

If the id is of type String, the search result is empty. For this to work, you need to do this:

var ObjectID = mongoose.Types.ObjectId;

TestModel.find({$and: [{_id: new ObjectID(id)}, {name: 'foo'}]}, function (err, doc){
    //
});

But, if i don’t use $and

TestModel.find({ _id: id, name: 'foo' }, function (err, doc){
    //
});

all works great.

[ekryski]

Your query doesn’t really make sense. What are you anding with? The query should have a second query param to and with. Like this:

Model.find( { $and: [ { _id: someId }, { _id: anotherId } ] }, function(...

or

Model.find( { $and: [ { a: 1 }, { a: { $gt: 5 } } ] } )

You should take a look http://www.mongodb.org/display/DOCS/Advanced+Queries#AdvancedQueries-%24and