九.Django---framework框架 分页

一. 分页

https://www.cnblogs.com/open-yang/p/11573538.html   

https://blog.csdn.net/qyf__123/article/details/84993125

https://www.cnblogs.com/MayDayTime/p/9890877.html

  序列化

class BookModelSerializers(serializers.ModelSerializer):
      class Meta:
          model = Book
          fields = "__all__"

from rest_framework.parsers import JSONParser,FormParser,MultiPartParser,FileUploadParser


from rest_framework.pagination import PageNumberPagination,LimitOffsetPagination
class MyPageNumberPagination(PageNumberPagination):
    page_size = 1
    page_query_param = 'page'
    page_size_query_param="size"
    max_page_size=2

class MyLimitOffsetPagination(LimitOffsetPagination):
    default_limit=1


class BookView(APIView):
    # authentication_classes = [TokenAuth,] # [TokenAuth(),]
    # permission_classes = []
    # throttle_classes = []
    parser_classes = [JSONParser,FormParser]

    def get(self,request):
        print("request.user",request.user)
        print("request.auth",request.auth)
        print("_request.body",request._request.body)
        print("_request.GET",request._request.GET)
        book_list=Book.objects.all()
        # 分页
        pnp=MyLimitOffsetPagination()
        books_page=pnp.paginate_queryset(book_list,request,self)
        bs=BookModelSerializers(books_page,many=True,context={'request': request})
        return Response(bs.data)
    
    def post(self,request):
        # post请求的数据
        print("request.data",request.data)
        bs=BookModelSerializers(data=request.data)
        if bs.is_valid():
            print(bs.validated_data)
            bs.save()# create方法
            return Response(bs.data)
        else:
            return Response(bs.errors)



    序列化

class AuthorModelSerializers(serializers.ModelSerializer):

   class Meta:
      model = Author
      fields = "__all__"

class AuthorModelView(viewsets.ModelViewSet):
    #authentication_classes = [TokenAuth,]
    #permission_classes=[SVIPPermission,]
    #throttle_classes = [VisitRateThrottle]    # 限制某个IP每分钟访问次数不能超过20次
    queryset = Author.objects.all()
    serializer_class = AuthorModelSerializers
    pagination_class = MyPageNumberPagination
    renderer_classes = []


def get_random_str(user):
    import hashlib,time
    ctime=str(time.time())
    md5=hashlib.md5(bytes(user,encoding="utf8"))
    md5.update(bytes(ctime,encoding="utf8"))
    return md5.hexdigest()

settings

REST_FRAMEWORK = {

    # "DEFAULT_AUTHENTICATION_CLASSES": ["app01.utils.TokenAuth",],
    # "DEFAULT_PERMISSION_CLASSES": ["app01.utils.SVIPPermission",],
    # "PAGE_SIZE":1
}

二. 分页全局

也可通过自定义Pagination类，来为视图添加不同分页行为。在视图中通过pagination_class属性来指明。

class LargeResultsSetPagination(PageNumberPagination):
    page_size = 1000
    page_size_query_param = 'page_size'
    max_page_size = 10000
    
class BookDetailView(RetrieveAPIView):
    queryset = BookInfo.objects.all()
    serializer_class = BookInfoSerializer
    pagination_class = LargeResultsSetPagination

REST framework提供了分页的支持。

我们可以在配置文件中设置全局的分页方式，如：

REST_FRAMEWORK = {
    'DEFAULT_PAGINATION_CLASS':  'rest_framework.pagination.PageNumberPagination',
    'PAGE_SIZE': 100  # 每页数目
}