SubFactory should preserve signal muting behaviour of the factory used

[kristaps]

It appears that using SubFactory bypasses any signal muting attached to the factory used, which seems counter-intuitive.

Is it possible to keep the muting defined on the factory, or to allow controlling the signal muting when invoking SubFactory?

An example to demonstrate the problem:

import factory
from django.db import models
from django.db.models.signals import post_save
from django.dispatch import receiver

class SomeModel(models.Model):
    pass

class OtherModel(models.Model):
    some = models.ForeignKey(SomeModel)

@receiver(post_save, sender=SomeModel)
def mess_stuff_up(instance, created, raw, **kwargs):
    raise Exception("BOOM!")

@factory.django.mute_signals(post_save)
class SomeModelFactory(factory.DjangoModelFactory):
    class Meta:
        model = SomeModel

class OtherModelFactory(factory.DjangoModelFactory):
    class Meta:
        model = OtherModel

    some = factory.SubFactory(SomeModelFactory)

# Signal handler not triggered, as expected from the mute_signals use
SomeModelFactory()

# SubFactory(SomeModelFactory) triggers the post_save receiver, despite
# the post_save signal being muted on SomeModelFactory
OtherModelFactory()

[ErwinJunge]

This actually works in versions <2.9. I found this issue when I upgraded my packages and a bunch of tests started failing with IntegrityErrors.

[chuckoy]

Would be nice to get some clarity on this. There's a point to be made about muting signals in the first place, but having the functionality there and not having it muted in SubFactories does seem counter-intuitive.

If someone could point me in the right direction to restore this behaviour (if desired) I would be happy to make a PR for this.

[arthurio]

It would be nice to have this behavior back indeed! In the mean time, the workaround proposed for muting specific receivers can be used here as well (muting the signal altogether): https://github.com/FactoryBoy/factory_boy/issues/505#issuecomment-436316484

[pfcodes]

Any updates on a fix to this?

[last-partizan]

The fix is merged, will be available in the next release. (You can try using git version)