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from django.db.models.fields.related import ForeignKey
class SortableForeignKey(ForeignKey):
"""
Field simply acts as a flag to determine the class to sort by.
This field replaces previous functionality where `sortable_by` was
defined as a model property that specified another model class.
"""
def south_field_triple(self):
try:
from south.modelsinspector import introspector
cls_name = '{0}.{1}'.format(
self.__class__.__module__,
self.__class__.__name__)
args, kwargs = introspector(self)
return cls_name, args, kwargs
except ImportError:
pass
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