F() objects in mongoengine similar to that in django

Question

Do we have something similar to F() objects in mongoengine, similar to that in Django.

If yes then please help me in how to use it.

If No then please suggest a way to incorporate similar functionality in mongoengine.

Any help would be really appreciated. Thanks in advance.

Answer 1

You can use where operator ( since v0.5 ):

User.objects( ).where( "this.firstname == this.lastname" )

Note that this is inefficient, since Mongo will not use indexes with these queries and thus it should be avoided:

http://docs.mongodb.org/manual/reference/operators/#_S_where