Does imports of related models affect cascade deletion?

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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