ValueError: Cannot create form field for 'room_setup' yet, because its related model 'main_page.roomsetup' has not been loaded yet

Hi,

given the following models and model form I get the error in the subject, apparently because the related model "roomsetup" is defined *after* the "RoomsForm" form and is not loaded at the time the form is created.

class rooms(models.Model):
    [.... lots of other fields]
    room_setup = models.ForeignKey('roomsetup', verbose_name='Room setup', blank=False, default='')

    def __unicode__(self):
        return self.name


class RoomsForm(ModelForm):
    class Meta:
        model = rooms
        fields = ('active', 'location', 'level', 'room_setup', 'name', 'daylight', 'area', 'height', 'notes',)

.... other models and forms...

class roomsetup(models.Model):
    [....lots of fields]

    def __unicode__(self):
        return self.name

If I move the RoomsForm declaration *below* the room setup class, everything works fine, but I would like to keep the model and its associated form together in my code (this makes sense?).

So is there another  way how can I avoid this situation?

Thanks
Thomas

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