mongo c++ driver BSONObj object id serialization problem.

[mayank gupta]

I am using the mongo-cpp driver trying to convert the object ID of a BSON object to a string BSONObj r=some_function(); BSONElement oi; r.getObjectID(oi); OID o=oi.__oid(); cout<<"oid:"<<o.toString()<<endl;` I am sure that the BSONObj has valid data but getting the following error BSONElement: bad type #somenumber ## Can you suggest any method to get the object id in string format ?

[Eliot Horowitz]

What is "some number"

Are you sure its an OID?

Have you tried printing out r

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[mayank gupta]

Its 40. I have tried printing the object r and everything is printing correctly. I am able to access all other members such as numbers and string properly save the OID.

[Eliot Horowitz]

Can you send the output of printing r?

[mayank gupta]

Output of r.toString()

{ _id: ObjectId('4f2269b8385db519a8e4b1f6'), rule: { condition: "{num:{$gt:20}}", continue: "false" } }

[mayank gupta]

Another interesting observation is that when I cleaned and built the source again it ran correctly for the first time but gave the same error afterwards.

[mayank gupta]

I figured it out. When i made a query to the db I didn't requested a getOwned() method from the buffered BSONObj .
This made the results inconsistent. Thanks for helping.