Django Admin interface with pickled set

I have a model that has a pickled set of strings. (It has to be pickled, because Django has no built in set field, right?)开发者_开发技巧

class Foo(models.Model):

    __bar = models.TextField(default=lambda: cPickle.dumps(set()), primary_key=True)

    def get_bar(self):
        return cPickle.loads(str(self.__bar))

    def set_bar(self, values):
        self.__bar = cPickle.dumps(values)

    bar = property(get_bar, set_bar)

I would like the set to be editable in the admin interface. Obviously the user won't be working with the pickled string directly. Also, the interface would need a widget for adding/removing strings from a set.

What is the best way to go about doing this? I'm not super familiar with Django's admin system. Do I need to build a custom admin widget or something?

Update: If I do need a custom widget, this looks helpful: http://www.fictitiousnonsense.com/archives/22

Update 2: Now I'm looking through different relational models to see if that will work. One idea I'm toying with:

class FooMember(models.Model):
      name = models.CharField(max_length=120)
      foo = models.ForeignKey('Foo')

class Foo(models.Model):
      def get_names(self):
          return FooMember.objects.filter(foo__exact=self)

Disadvantages of this include:

• It feels excessive to make an entire model for one data field (name).
• I would like the admin interface for Foo to allow the user to enter a list of strings. I'm not sure how to do that with this setup; making a custom form widget seems like less work.

Uhm. Django usually stores it's data in an SQL database. Storing a set as a pickled string is definietly not the best way to use an SQL database. It's not immediately obvious which is the right solution in your case, that depends what is in that set, but this is the wrong solution in any case.

You might want a new table for that set, or at least save it as comma separated values or something.