How to query a Python mongoengine Queryset?

Question

How can I query a queryset returned by MongoEngine? Based on the documentation I couldn't find any information about querying querysets: http://docs.mongoengine.org/apireference.html#mongoengine.queryset.QuerySet

import datetime
thirty_days_in_the_past = datetime.datetime.now() - datetime.timedelta(days=30)

def last_messages(from_date):
    messages = Messages.objects(sent_at__gt=from_date)
    return messages

messages = last_messages(thirty_days_in_the_past)

Then I would like to get messages with a particular subquery such as finding an author_id "ABC":

messages.query(author_id="ABC")

The reason I am looking to do this as the initial query itself is used by a component and a subquery of it is used by another component and I would like to reuse the query.

martin s. · Accepted Answer · 2017-03-16 14:14:32Z

1

Just call the queryset with the narrowed-down query or use .filter() (which is just an alias). The mongoengine documentation does not really mention the possibility to just call the queryset with another query (and the existence of filter) for some reason.

author_messages = messages(author_id="ABC")
# or
author_messages = messages.filter(author_id="ABC")

"Fun fact", the django orm, which mongoengine took heavy inspiration from (the whole query language, including the __ keyword syntax), does mention the filter method in its docs :)

answered Mar 16, 2017 at 14:14

martin s.

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