将分页应用于Raw查询以防止加载所有记录

Question

我有以下基于类的视图，它们按预期工作，并根据需要使用参数http://127.0.0.1:8000/api/collection/fromdetroit?page=1 >> ?page=2等对页面进行分页

class ListReleasesCollectionView(APIView):

    def get(self, request, format=None, *args, **kwargs):
        try:
            releases = ReleasesAll.objects.raw('SELECT releases.*, \'\' as num FROM releases_all releases INNER JOIN release_artists ra ON ra.release_id=releases.id LEFT JOIN genre_artists ON genre_artists.artist=ra.artists LEFT JOIN genre_labels ON genre_labels.label=releases.label_no_country WHERE genre_artists.genre=%s OR genre_labels.genre=%s GROUP by releases.id ORDER BY releases.date DESC',(kwargs['collection'],kwargs['collection']))
            paginator = PageNumberPagination()
            result_page = paginator.paginate_queryset(releases, request)
            serializer = ReleasesSerializer(result_page, many=True, context={'request': request})
            response = Response({'results':{'image_url':'', 'page_header':'','releases': serializer.data}}, status=status.HTTP_200_OK)
            return response

        except ReleasesAll.DoesNotExist:
            return Response(
                data = {
                    "message": "{} does not exist".format(kwargs["collection"])
                },
                status=status.HTTP_404_NOT_FOUND
            )

但是，它运行速度非常慢，因为它必须先下载所有结果，然后再分页。这是Django工具栏的结果。

我一次只能下载60个结果，因为上面返回了成千上万个结果。

settings.py中的分页设置

REST_FRAMEWORK = {
    'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.LimitOffsetPagination',
    'PAGE_SIZE': 10
}

Answer 1

添加分页类别。创建pagination_class.py。

from rest_framework.pagination import PageNumberPagination


class StandardResultsSetPagination(PageNumberPagination):
    page_size_query_param = 'limit'

将此添加到settings.py。

REST_FRAMEWORK = {
    ...
    'DEFAULT_PAGINATION_CLASS': 'app_name.pagination_class.StandardResultsSetPagination',
 ...
}