通过pymongo使用重命名的字段从mongodb检索字段

Question

As similar to mongoDB code, such as

db.collection.aggregate({$project:{"ID_NO":"id"}})

Need syntax for pymongo, i have a query

query = dict(app_name='Test', is_enabled=True)
element_list = elementsettings.objects(**query)

I have tried -

query = dict(app_name='Test', is_enabled=True, $project={'is_app_enabled':'is_enabled'})

Answer 1

当与Pymongo一起使用时， $project应该在'$project'之类的引号内。

Answer 2

In python:

db.collection.aggregate([{"$project": {"ID_NO":"$id"}])

Note that the projection operation sits inside an array of aggregation operators. Also note that this particular project will erase all other fields.