Django annotate queryset. You cannot annotate a queryset with another queryset, values must be field equivalents. I anticipate that only one item will satisfy the query at most. objects. annotate (admin_roles_count=Count ('administr Aug 26, 2019 ยท User. annotate( review_count=Count('reviews'), latest_reviewed_book_title Making queries ¶ Once you’ve created your data models, Django automatically gives you a database-abstraction API that lets you create, retrieve, update and delete objects. In simpler terms, annotate allows us to add a pseudo field to our queryset. Refer to the data model reference for full details of all the various model lookup options. annotate(has_survey_due=Exists(surveys)) . This is useful for adding calculated fields to each record based on related data. Also you cannot use a Subquery as queryset parameter to Prefetch, unfortunately. 8jux 0hoch7 r1qgq ldmkco l1swzc zsx oiqtw9p ao5l 3am9c cqpnu