DRF分页

为什么使用分页

因为常用啊

DRF提供的三种分页

from rest_framework.pagination import PageNumberPagination, LimitOffsetPagination, CursorPagination

全局配置

REST_FRAMEWORK = {
    "PAGE_SIZE": 2
}

第一种 PageNumberPagination 看第n页, 每页显示n条数据

http://127.0.0.1:8000/book?page=2&size=1

class MyPageNumber(PageNumberPagination):
    page_size = 2        # 每页显示多少条
    page_size_query_param = "size"      # url中每页显示条数的参数
    page_query_param = "page"            # url中页码的参数
    max_page_size = None                    # 最大页码数限制

class BookView(APIView):
    def get(self, request):
        book_list = Book.objects.all()
        page_obj = MyPageNumber()
        page_article = page_obj.paginate_queryset(queryset=book_list, request=request, view=self)
        ret = BookSerializer(page_article, many=True)
        return Response(ret.data)

class BookView(APIVew):
    def get(self, request):
        book_list = Book.objects.all()
        # 分页
        page_obj = MyPageNumber()
        page_article = page_obj.paginate_queryset(queryset=book_list, request=request, view=self)
        ret = BookSerializer(page_article, many=True)
        # 返回带超链接 需返回的时候用内置的响应方法
        return page_obj.get_paginated_response(ret.data)    

第二种 LimitOffsetPagination 在第n个位置 向后查看n条数据

http://127.0.0.1:8000/book?offset=2&limit=1

class MyLimitOffset(LimitOffsetPagination):
    default_limit = 1
    limit_query_param = "limit"
    offset_query_param = "offset"
    max_limit = 999

视图

# 视图和你上面的大体一致
# 只有用的分页类不同, 其他都相同
class BookView(APIView):
    def get(self, request):
        book_list = Book.objects.all()
        page_obj = MyLimitOffset()
        page_article = page_obj.paginate_queryset(queryset=book_list, request=reqeust, view=self)
        ret = BookSerializer(page_ariticle, many=True)
        # return Response(ret.data)
        return page_obj.get_paginated_response(ret.data)

第三种 CursorPagination加密游标的分页 把上一页和下一页的id记住

class MyCursorPagination(CursorPagination):
    cursor_query_param = "cursor"
    page_size = 1
    ordering = "-id"

视图

class BookView(APIView):
    def get(self, request):
        book_list = Book.objects.all()
        page_obj = MyCursorPagination()
        page_article = page_obj.paginate_queryset(queryset=book_list, request=request, view=self)
        ret = BookSserializer(page_article, many=True)
        return page_obj.get_paginated_response(ret.data)