On Sat, 2007-02-24 at 18:41 +0000, Manoj Govindan wrote:
> Hi,
> Consider a model and a simple test for the model.
>
> class Project(models.Model):
> name = models.CharField(maxlength = 255)
> parent = models.ForeignKey('self', null = True)
>
> class ProjectTests(unittest.TestCase):
> def testCreateProjectAndSubProject(self):
> project = Project(name = "aProject")
> subProject = Project(name = "aSubProject", parent = project)
>
> project.save()
> self.assert_(project.id) # Passes
>
> subProject.save()
> self.assert_(subProject.parent) # Fails
>
> It seems that even though the Parent object gets saved and has an id
> (see the line in the test with the comment "Passes") the parent object
> is None when I access it through the child. It seems that parent and
> child.parent point to two different objects even though the original
> parent was supplied to the child's constructor.
You should be able to test that last claim by looking at id(project) and
id(subProject.parent) to see if that is the case (your final assert
suggests that it was never assigned and hence is None, not that a new
instance was created). Is suspect you'll find they are the same instance
at the Python level, but something odd is going on when the saving
occurs, but I haven't tested this (just thinking of how Django handles
field attributes). You could also test the contents of subProject.parent
prior to the save() call to help narrow down where the mystery takes
place, too.
One change to try would be to ensure you save the project instance
first, before trying to refer to it.
I don't have time to delve too deeply into this problem this afternoon,
but it would be interesting to try and work out what is going on here.
Regards,
Malcolm
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