Mix-in class for Django ORM objects to allow for more robust object instantiation from keyword arguments.

AutoFkShifterMixIn.py

class AutoFkShifterMixIn(object):
    def __init__(self, *args, **kw):
        """Automatically translate any foreign keys to the the *_id field if an id rather than an object has been provided.  Also removes m2m kwargs (they'll cause Django ORM to error out)."""
        for m2m_field in filter(lambda f: f.name in kw, self._meta.many_to_many):
            del kw[m2m_field.name]
        for fk_field in filter(lambda f: isinstance(f, models.ForeignKey), self._meta.fields):
            if fk_field.name in kw and isinstance(kw[fk_field.name], (int, long, str)):
                kw['{}_id'.format(fk_field.name)] = kw.pop(fk_field.name)
        super(AutoFkShifterMixIn, self).__init__(*args, **kw)