Write Inside Loop (ARCH2052)

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Key python.orm.write-inside-loop · Severity error · Category orm

Calling save() / commit() on every loop iteration produces one DB round-trip per row instead of a batch. Batch the writes instead.

Incorrect

for row in rows:
    user = User(name=row.name)
    user.save()  # a separate INSERT per row

users = [User(name=row.name) for row in rows]
User.objects.bulk_create(users)  # one batched INSERT

Accumulate objects and persist them once outside the loop with bulk_create.