options.py 文件源码

def get_preserved_filters(self, request):
        """
        Returns the preserved filters querystring.
        """
        match = request.resolver_match
        if self.preserve_filters and match:
            opts = self._meta
            info = (self._meta.app_label, self.block_type_name)
            changelist_name = '%s_%s_changelist' % info
            current_url = '%s:%s' % (match.app_name, match.url_name)
            changelist_url = 'admin:%s' % changelist_name
            if current_url == changelist_url:
                preserved_filters = request.GET.urlencode()
            else:
                preserved_filters = request.GET.get('_changelist_filters')

            if preserved_filters:
                return urlencode({'_changelist_filters': preserved_filters})
        return ''