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.

On Thursday, July 30, 2015 at 9:38:09 AM UTC-4, Markus Amalthea Magnuson 
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.
>
> 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()
>

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