Django – Rollback save with transaction atomic

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Atomicity Documentation

To summarize, @transaction.atomic will execute a transaction on the database if your view produces a response without errors. Because you’re catching the exception yourself, it appears to Django that your view executed just fine.

If you catch the exception, you need to handle it yourself: Controlling Transactions

If you need to produce a proper json response in the event of failure:

from django.db import SomeError, transaction

def viewfunc(request):
    do_something()

    try:
        with transaction.atomic():
            thing_that_might_fail()
    except SomeError:
        handle_exception()

    render_response()

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