Carasel Carasel - 2 months ago 113
Node.js Question

Argument passed in must be a string of 24 hex characters - I think it is

I have a method to find a document in my database based on its ObjectID:

console.log('id: ' + id + ' type: ' + typeof id);
collection.findOne({'_id':new ObjectID(id)}, function(error,doc) {
if (error) {
callback(error);
} else {
callback(null, doc);
}
});


When I run it I get the following error:

/myPath/node_modules/monk/node_modules/mongoskin/node_modules/mongodb/lib/mongodb/connection/base.js:245
throw message;
^
Error: Argument passed in must be a single String of 12 bytes or a string of 24 hex characters
at new ObjectID (/myPath/node_modules/mongodb/node_modules/bson/lib/bson/objectid.js:38:11)
at /myPath/collectionDriver.js:134:41


This refers to the
collection.findOne()
line above.

The console log I have before that call outputs the id as a string of 24 hex characters:

id: "55153a8014829a865bbf700d" type: string


Before this I convert the id from an object to a string using
JSON.stringify()
but it appears to work successfully as shown in my console.log.

Running
db.myCollection.findOne({_id : ObjectId("55153a8014829a865bbf700d")})
in Robomongo brings back the expected result.

Answer

The id that was passed in to my function was already an object ID in this case, so did not need a new ObjectID to be created from it.

When ObjectIDs are logged out to the console they appear as hex strings, rather than ObjectID("hexString"), so I thought I needed to convert it to do the find, but it was already in the format that I needed.

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