MongoDB queries with null value

Question

My collection (MongoDB v 2.0.2) has following records:

db.organization.find({})
{ \"_id\" : 1001, \"path\" : [ ], \"parent\" : null }
{ \"_id\" : 1002, \"pat         


        

Answer 1

I had the same issue. After reading the following documents

• querying and nulls
• BSON specification

I tried to query for the different BSON element types and found that my null was represented as a BSON element type 6 (undefined, deprecated) instead of the expected BSON element type 10 (null).

db.collection.find({ field: { "$type" : 6} };