custom lookup

class CPCommonQuerySet(QuerySet, CPCommonMixin):
    def _filter_or_exclude(self, negate, *args, **kwargs):
        cust_lookups = []
        if kwargs.items():
            if kwargs.items()[0][0].endswith('__false'):
                negate = True
                cust_lookups = filter(lambda s: s[0].endswith('__false'), kwargs.items())
            elif kwargs.items()[0][0].endswith('__true'):
                negate = False
                cust_lookups = filter(lambda s: s[0].endswith('__true'), kwargs.items())

        for lookup in cust_lookups:
            kwargs.pop(lookup[0])
            lookup_prefix = lookup[0].rsplit('__', 1)[0]
            kwargs.update({
                lookup_prefix + '__regex': '"%s": %s' % (lookup[1], 'false' if negate else 'true'),
            })
        return super(self.__class__, self)._filter_or_exclude(negate, *args, **kwargs)