Ship Django features in half the keystrokes

The underused ORM tricks, admin shortcuts, and query patterns that make daily Django work fast.

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Chapter 4 · Querysets

Annotate once, drop the N+1

Replace a loop of per-object counts with one annotated query.

# before: one query per author
for a in Author.objects.all():
    a.book_total = a.book_set.count()

# after: a single round trip
authors = Author.objects.annotate(
    book_total=Count("book")
)

Django Productivity Patternsp. 41

Django is fast. Your workflow around it isn't.

N+1

One template loop silently fires hundreds of queries. Nobody notices until production slows to a crawl.

40 min

Wiring the same admin filters, inlines, and search fields by hand on every new model, every project.

200 lines

Custom view code that three lines of a bulk_create or a well-placed manager would have replaced.

What's inside

42 patterns, each on one page: the problem, the code, the why. No filler chapters.

01Kill N+1 queries with select_related and prefetch_related maps
02Build admin screens in minutes with reusable ModelAdmin mixins
03Push logic into custom managers and QuerySet methods
04Bulk_create, bulk_update, and F() for write-heavy paths
05Constraints and conditional indexes that guard data at the DB
06Signals, transactions, and select_for_update done safely

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Django Productivity Patterns Handbook

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Ship Django features in half the keystrokes

Annotate once, drop the N+1

Django is fast. Your workflow around it isn't.

What's inside

One book. One price. Yours forever.

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