google app engine - Django-nonrel form field for ListField

Question

I'm experimenting with django-nonrel on appengine and trying to use a djangotoolbox.fields.ListField to implement a many-to-many relation. As I read in the documentation a ListField is something that you can use to make a workaround for djamgo-nonrel not supporting many-to-many relations.

This is an excerpt from my model:

class MyClass(models.Model):
    field = ListField(models.ForeignKey(AnotherClass))

So if I am getting this right I am creating a list of foreign keys to another class to show a relationship with multiple instances of another class

With this approach everything works fine ... No Exceptions. I can create `MyClass' objects in code and views. But when I try to use the admin interface I get the following error

No form field implemented for <class 'djangotoolbox.fields.ListField'>

So I though I would try something that I haven't done before. Create my own field. Well actually my own form for editing MyClass instances in the admin interface. Here is what I did:

class MyClassForm(ModelForm):
    field = fields.MultipleChoiceField(choices=AnotherClass.objects.all(), widget=FilteredSelectMultiple("verbose_name", is_stacked=False))
    class Meta:
        model = MyClass

then I pass MyClassForm as the form to use to the admin interface

class MyClassAdmin(admin.ModelAdmin):
    form = MyClassForm

admin.site.register(MyClass, MyClassAdmin)

I though that this would work but It doesn't. When I go to the admin interface I get the same error as before. Can anyone tell what I am doing wrong here ... or if you have any other suggestions or success stories of using the ListField, SetField, etc. from djangotoolbox.fields in the admin interface it would be very much appreciated.

Answer 1

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