F() objects in mongoengine similar to that in django

问题

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.

回答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

来源：https://stackoverflow.com/questions/14119005/f-objects-in-mongoengine-similar-to-that-in-django