models.py 文件源码

def _get_selectors(self, instance, content_type=None):
        if content_type is None:
            content_type = ContentType.objects.get_for_model(instance)

        # Lazily pre-process per-content type selector definitions.
        if len(self.content_type_to_selectors) == 0:
            for k, v in settings.JSONATTRS_SCHEMA_SELECTORS.items():
                a, m = k.split('.')
                self.content_type_to_selectors[
                    ContentType.objects.get(app_label=a, model=m)
                ] = v

        # Build full list of selectors from instance.
        selectors = []
        for s in self.content_type_to_selectors[content_type]:
            selector = instance
            s = s.replace('.pk', '_id')
            for step in s.split('.'):
                selector = getattr(selector, step, None)
            selectors.append(str(selector))
        return tuple(selectors)