django-categories/categories/fields.py

from django.db.models import ForeignKey, ManyToManyField


class CategoryM2MField(ManyToManyField):
    def __init__(self, **kwargs):
        from .models import Category
        if 'to' in kwargs:
            kwargs.pop('to')
        super(CategoryM2MField, self).__init__(to=Category, **kwargs)


class CategoryFKField(ForeignKey):
    def __init__(self, **kwargs):
        from .models import Category
        if 'to' in kwargs:
            kwargs.pop('to')
        super(CategoryFKField, self).__init__(to=Category, **kwargs)

try:
    from south.modelsinspector import add_introspection_rules
    add_introspection_rules([], ["^categories\.fields\.CategoryFKField"])
    add_introspection_rules([], ["^categories\.fields\.CategoryM2MField"])
except ImportError:
    pass