Does imports of related models affect cascade deletion?

[Markus Amalthea Magnuson]

Hey,

I stumbled upon a piece of code and a comment that says this:

Deleting a model object that has related objects will only cascade delete those objects if their models have been imported.

Is this true? I have not found it in the documentation and would like to add a reference to the code comment so others won't be as confused as I am.

Here's an illustration (from memory, disregard if code is not valid python):

mymodel.py:

from django.db import models

class MyModel(models.Model):

    foo = models.CharField()

    bar = models.CharField()

my_other_model.py:

from django.db import models

from mymodel import MyModel

class MyOtherModel(models.Model):

    baz = models.CharField()

    bar = models.ForeignKey(MyModel)

some_source_file.py:

from mymodel import MyModel

# Without this line, deleting MyModel objects will not delete its related

# MyOtherModel objects (?):

from my_other_model import MyOtherModel

obj = MyModel.objects.get(pk=123)

obj.delete()

[Tim Graham]

No, import of related models shouldn't affect cascade deletion. Please open a bug report with steps to reproduce if that's actually the case. Possibly it could be a bug that's fixed by the app loading refactor in 1.7.

[Marc Aymerich]

On Thu, Jul 30, 2015 at 3:38 PM, Markus Amalthea Magnuson
<markus....@gmail.com> wrote:
> Hey,
>
> I stumbled upon a piece of code and a comment that says this:
>
> Deleting a model object that has related objects will only cascade delete
> those objects if their models have been imported.
>
> Is this true? I have not found it in the documentation and would like to add
> a reference to the code comment so others won't be as confused as I am.

Is this models module called models.py and does it live inside a
Django application listed in INSTALLED_APPS?


--
Marc

[Markus Amalthea Magnuson]

I will fetch the actual piece of code and build a small test case out of it, will reply again in this thread when I have some more info.

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