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django-users mailing list Search for information in the archives of the django-users mailing list, or post a question. Index, Module Index, or Table of Contents Handy when looking for specific information. Getting help FAQ Try the FAQ - it's got answers to many common questions. Order of annotate() and values() clauses.Order of annotate() and filter() clauses.Aggregations and other QuerySet clauses.Generating aggregates for each item in a QuerySet.Spacinov donated to the Django Software Foundation to annotate ( num_books = Count ( "book" )). below_5 12 # The top 5 publishers, in order by number of books. num_books 73 # Each publisher, with a separate count of books with a rating above and below 5 > from django.db.models import Q > above_5 = Count ( "book", filter = Q ( book_rating_gt = 5 )) > below_5 = Count ( "book", filter = Q ( book_rating_lte = 5 )) > pubs = Publisher.
annotate ( num_books = Count ( "book" )) > pubs,. > from django.db.models import Count > pubs = Publisher. # Each publisher, each with a count of books as a "num_books" attribute. aggregate ( Avg ( "price" )) # All the following queries involve traversing the BookPublisher # foreign key relationship backwards. > from django.db.models import Avg > Book. count () 73 # Average price across all books. filter ( publisher_name = "BaloneyPress" ). Learn a VFX process for integrating 3D objects into real scenes using 3ds Max, Nuke, and V-Ray. Professional Modeling of 3D Cartoon Characters. count () 2452 # Total number of books with publisher=BaloneyPress > Book. Master the software and learn how to create hyperrealistic images through object modeling and spatial lighting.
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