Allow third-party plugin to register signals hook

[Guibi1]

Plugin Version

0.4.1

Proposed functionality

I would like use a pre_save hook for models created in the custom_objects plugin. I tried making a receiver where the sender is the model that I got with #276.

Use case

This would allow to write custom plugins to make computed fields on the models.

External dependencies

No response

[jeremystretch]

@Guibi1 can you register a pre_save signal receiver for any class and then just inspect the sending class to check whether it's a certain custom object?

[Guibi1]

I can save without the exception getting raised (i've also tested with real logic).
Can you confirm test2 is what you meant?

MyObject = CustomObjectType.objects.get(name="myobject").get_model()

@receiver(pre_save, sender=MyObject)
def test1(sender, instance, **kwargs):
    raise "how is this never triggered??"
        
@receiver(pre_save)
def test2(sender, instance, **kwargs):
    if isinstance(sender, MyObject):
        raise "how is this never triggered??"

[jeremystretch]

Yes, the second example is what I'm suggesting. However, you need to check whether the sending instance is an instance of the actual custom object, not the CustomObjectType.

I'm going to close this FR as it appears the functionality you want it already supported. If you need further assistance, please start a discussion.