A model field may have a 'choices' option to which you assign an
iterable object -- typically a list, but this can also be an iterable
function. Is there a way to assign a class method/function rather than
a module function?
Here's what I'm trying to do: I have a model, "Ticket" that can be in
any one of a small number of states, such as "open", "approved", "in
progress" and "closed" (it's a fixed number of states- new ones don't
get added). When a Ticket is in a specific state, it is only legal to
move to one or two other states, so the admin form (or any other
forms) should only display the legal choices in the list.
In theory, the simplest way to do this would be to define it in the
model form, e.g. as in this wishful-thinking bit of code:
class Ticket(models.Model):
# can't do this... no access to self
state = models.IntegerField(choices=self.state_choices(),
default=OPEN_STATE)
def state_choices(self):
for choice in self.state_instance.choices():
yield choice
Of course, that isn't possible. The alternative is to customize every
form that uses this model, including the admin form so that the
__init__ method populates the choice list with the correct choices for
the current state.
Is there another approach I'm missing?
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