MongoDB $oid vs ObjectId

问题

I'm trying to get mongodb query working. Collection comes in the format:

{
"_id": {
    "$oid": "54651022bffebc03098b4567"
},
"browser": "ie",
"browser_version": "10.0 Desktop",
"os_version": "8",
"device": null,
"os": "Windows"
}

The following works:

{
    "_id": {
        "$in": [
            {
                "$oid": "54651022bffebc03098b4567"
            },
            {
                "$oid": "54651022bffebc03098b4568"
            }
        ]
   }
}

However, I get a syntax error for the following:

{
    "_id": {
        "$in": [
            ObjectId("54651022bffebc03098b4567"),
            ObjectId("54651022bffebc03098b4568")
        ]
    }
}

There are a similar questions that suggested that ObjectId should work:

How to create query with ObjectIds using java?

$all parameter in mongodb does not work with ObjectId list

回答1:

The MongoLab UI uses Strict MongoDB Extended JSON so Object IDs are represented thusly, as in the second code block of the OP:

{ "$oid": "<id>" }

来源：https://stackoverflow.com/questions/26938598/mongodb-oid-vs-objectid