Having _id which are more than 12 bytes long

[Samyak Bhuta]

Hello Community,

Error : "Argument passed in must be a single String of 12 bytes or a
string of 24 hex characters in hex format"

Yes, I am trying to a use an hex string for my _id field which is not
24 char long (12 bytes), but a 32 char hex string (16 bytes), as I am
using uuid instead of implicitly generated _id by mongodb. As far as
mongodb is concerned, having _id not set as ObjectID ( BSON's object
id ) is perfectly alright.

So, should I conclude that the node-mongodb-native has assumed that
all the user of the driver would be relying on implicitly generated
Object-ids for _id field ? If yes, is there any specific reason to be
enforce this ? Could I write an additional method in objectid.h and
objectid.cc that support uuids ? Would it be a wise thing to do ?

I see, using uuids as recurring scenario in many application
development projects, and would be great to have it along !!!

Samyak Bhuta

[christkv]

The _id's are generated by the driver not mongodb. You can assign any
value you want to the _id field as long as it's a valid BSON type and
is unique. the driver assigns one for you in case you don't have one
for convenience. So no need to hack anything.

collection.insert({_id : "12345678123456781234567812345678", field:
'1'}, {safe:true}, function(err, result) {
test.equal(null, err);

collection.find({_id :
"12345678123456781234567812345678"}).toArray(function(err, items) {
test.equal(null, err);
test.equal(items[0]._id, "12345678123456781234567812345678")
test.equal(items[0].field, '1')

finished_test({insert_doc_with_uuid:'ok'});
})
});

[Samyak Bhuta]

@christkv,

I just have a doubt following to your example code. In the example
specified UUID will be inserted as a string, occupying twice the
space. I could see that we can use BSON Binary type to save space. I
could also see the example at https://github.com/christkv/node-mongodb-native/blob/master/examples/types.js#L30.

But, I could not make out how we can even specify the subtype for the
same (in my case it would be UUID) ? I think I am not able to make out
the syntax for that. What I would like to do is same as described at
http://blog.mikeobrien.net/2010/08/working-with-guids-in-mongodb-with-ruby.html
.


I would also like to bring to your attention the code at ...
* https://github.com/tdegrunt/mongodb-rest/blob/master/lib/rest.js#L23
* https://github.com/tdegrunt/mongodb-rest/blob/master/lib/rest.js#L91
* https://github.com/tdegrunt/mongodb-rest/blob/master/lib/rest.js#L109

It looks that the the author has assumed that _id would be always of
BSON type ObjectId, which is not the case always.


Thanks for your prompt response. It was helpful and valuable.

Cheers,

Samyak