Django REST：JSON 响应中没有分页块 (PageNumberPagination)答案

【问题标题】：Django REST: No pagination block in JSON response (PageNumberPagination)Django REST：JSON 响应中没有分页块 (PageNumberPagination)
【发布时间】：2019-09-29 06:04:05
【问题描述】：

对于我的 API，我使用的是 api_view 装饰器。分页问题（JSON 响应）。我得到了没有“分页块”的响应：

[
    {
        "id": 18,
        "name": "Monitor Acer Test",
        "price": "2212.00",
        "stock": 21,
        "image": "/media/9hq.webp",
        "available": true
    },
    {
        "id": 17,
        "name": "Monitor LG Test",
        "price": "2512.00",
        "stock": 10,
        "image": "/media/811AFxM28YL._SX425_.jpg",
        "available": true
    }
]

我也尝试过覆盖默认的 PageNumberPagination，它可以工作，但仍然没有“分页块”

我的 api 视图（查看 GET 示例 > 其他）：

@csrf_exempt
@api_view(['GET', 'POST',])
@permission_classes([AllowAny, ])
def product(request):
    item = request.data
    if request.method == 'POST':
        serializer = ProductSerializer(data=item)
        serializer.is_valid(raise_exception=True)
        serializer.save()
        return Response({"message": "Product created!", "data": request.data}, status=status.HTTP_201_CREATED)
    else:
        all_obj = Product.objects.filter(available=True)
        if len(all_obj) > 0:
            paginator = PageNumberPagination()
            result_page = paginator.paginate_queryset(all_obj, request)
            serializer = ProductSerializer(result_page, many=True)
            return Response(serializer.data, status=status.HTTP_200_OK)
        else:
            return Response({"message": "There is no created items!"}, status=status.HTTP_200_OK)

我的设置.py：

REST_FRAMEWORK = {
  'DEFAULT_AUTHENTICATION_CLASSES': (
    'rest_framework_jwt.authentication.JSONWebTokenAuthentication',),

  'DEFAULT_PERMISSION_CLASSES': ['rest_framework.permissions.AllowAny',],
  'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.PageNumberPagination',
  'PAGE_SIZE': 2
}

预期结果：

{
    "count": 1023
    "next": "https://api.example.org/accounts/?page=5",
    "previous": "https://api.example.org/accounts/?page=3",
    "results": [
       …
    ]
}

【问题讨论】：

标签： django python-3.x pagination django-rest-framework

【解决方案1】：

你需要调用get_paginated_response()方法，

@csrf_exempt
@api_view(['GET', 'POST', ])
@permission_classes([AllowAny, ])
def product(request):
    item = request.data
    if request.method == 'POST':
        serializer = ProductSerializer(data=item)
        serializer.is_valid(raise_exception=True)
        serializer.save()
        return Response({"message": "Product created!", "data": request.data}, status=status.HTTP_201_CREATED)
    else:
        all_obj = Product.objects.filter(available=True)

        paginator = PageNumberPagination()
        result_page = paginator.paginate_queryset(all_obj, request)
        if result_page is not None:
            serializer = ProductSerializer(result_page, many=True)
            return paginator.get_paginated_response(serializer.data)
        else:
            serializer = ProductSerializer(all_obj, many=True)
        return Response(serializer.data, status=status.HTTP_200_OK)

注意不要调用len(queryset)，会导致N的DB连接数。改用 count() 方法

【讨论】：