On 19 fév, 18:00, ALJ <astley.lejas...@gmail.com> wrote:
> I want to set a value in a parent model based on the child class.
childs inherit parents attributes, so you don't have to "set a
value" (I assume you meant : "set an attribute's value") "in the
parent model" - just set it in the child.
> So,
> in this case, I would set the ExtendedUser.usertype depending on
> whether its "Teacher" or "Student".
You define usertype as a foreign key on a UserType model (which seems
rather weird to me but let's ignore this for now), but you didn't
provide the definition of this model class.
> I tried looking at using '%(class)s' to get the class name, but that
> didn't work.
???
The class of a Python object f is accessible as f.__class__
> Or can you explicitly pass values from the child classes?
"pass" to what ?
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>.
>
> def set_user_type():
> '''somehow find and return the user type based on the child
> class'''
>
> class ExtendedUser(models.Model):
> user = models.OneToOneField(User, blank=True, related_name='%
> (class)s')
> usertype = models.ForeignKey(UserType, default=set_user_type())
I think you really should take a couple hours learning Python - this
would save you a lot of time. Sorry but trying to explain why this
won't do what you think - and why this just can't do what you want -
would require rewriting too much of the FineManual(tm).
Anyway... if you know how to get the correct UserType for a given
class object, the following code should get you started:
def get_usertype_for(cls):
# code that returns the correct UserType value
# based on the class
# NB : 'cls' is the class *object*.
# if you want the class name, it's accessible as
# cls.__name__
raise NotImplementedError("TODO")
class ExtendedUser(models.Model):
user = models.OneToOneField(
User,
blank=True,
related_name='%(class)s'
)
usertype = models.ForeignKey(
UserType
)
def save(self, *args, **kw):
if not self.pk:
self.usertype = get_user_type_for(self.__class__)
super(ExtenderUser, self).save(*args, **kw)
And that's all folks...
Oh, and please do yourself a favour : learn Python.
HTH
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