restframework 分页组件、响应器

一、分页组件

1、PageNumberPagination

a、全局配置

导入模块

from rest_framework.pagination import PageNumberPagination

在视图类中配置

def get(self, request):
　　 # 注意：数据quweyset
    book_list = Book.objects.get_queryset().order_by('pk')
    # 实例化
    pnp = PageNumberPagination()
    # 调用方法
    pnp_list = pnp.paginate_queryset(book_list, request, self)
    book_serialize = BookModelSerialize(pnp_list, many=True, context={'request': request})
    return Response(book_serialize.data)

在配置文件中，修改全局page_size

REST_FRAMEWORK = {
    'PAGE_SIZE': 1,
}

注意：queryset，book_list

b、局部分页

自定义分页类，继承PageNumberPagination

class MyPageNumberPagination(PageNumberPagination):
    page_size = 1
    page_query_param = 'page'
    # 临时分页的参数 size=当前页面显示的数量
    page_size_query_param = 'size'
    # 临时分页size的最大值
    max_page_size = 3

视图类

class BookView(APIView):
    # parser_classes = [JSONParser]
    # 查看书籍， 返回所有数据(书籍信息)
    def get(self, request):
        # 获取book的所有数据
        book_list = Book.objects.get_queryset().order_by('pk')
        # 实例化对象
        pnp = MyPageNumberPagination()
        pnp_list = pnp.paginate_queryset(book_list, request, self)
        book_serialize = BookModelSerialize(pnp_list, many=True)
        return Response(book_serialize.data)

2、LimitOffsetPagination

导入模块

from rest_framework.pagination import LimitOffsetPagination

a、全局设置和上面相似，具体看源码

b、局部设置

分页类

class MyLimitOffsetPagination(LimitOffsetPagination):
    default_limit = 1
    # limit 分页 limit=n ,一页有n条数据
    limit_query_param = 'limit'
    # offset 偏移的数据量 offset=n，从第n条数据开始分页
    offset_query_param = 'offset'

视图类

class BookView(APIView):
    # parser_classes = [JSONParser]
    # 查看书籍， 返回所有数据(书籍信息)
    def get(self, request):
        # 获取book的所有数据
        book_list = Book.objects.get_queryset().order_by('pk')
        # 实例化对象
        pnp = MyLimitOffsetPagination()
        pnp_list = pnp.paginate_queryset(book_list, request, self)
        book_serialize = BookModelSerialize(pnp_list, many=True)
        return Response(book_serialize.data)

注意：limit是每页的数据量，offset是从第几条数据开始分页，不包含此条数据

3、终极视图组件分页

a、局部

注意：认证、权限可以有多个，分页器只能有一个

class AuthorViewSet(viewsets.ModelViewSet):
    # permission_classes = [PermissionSet]
    # authentication_classes = [ModelToken]
    pagination_class = MyLimitOffsetPagination
    queryset = Author.objects.all()
    serializer_class = AuthorModelSerializer

b、全局

REST_FRAMEWORK = {
    'DEFAULT_PAGINATION_CLASS': 'app01.components.Pagination.MyPageNumberPagination'
}

设置局部无分页

pagination_class = PageNumberPagination

源码解析

ModelViewSet -> mixins.ListModelMixin -> paginate_queryset

ModelViewSet => GenericViewSet -> generics.GenericAPIView -> paginate_queryset -> paginator -> pagination_class() -> api_settings.DEFAULT_PAGINATION_CLASS

3.CursorPagination （加密分页）

分页器

class MyCursorPagination(CursorPagination):
    cursor_query_param = 'cursor'
    page_size = 1
    ordering = '-id'  # 重写要排序的字段

视图

class ArticleList(APIView):
    def get(self, request, *args, **kwargs):
        res = {"code": 0}
        article_list = models.Article.objects.all().order_by("id")
        # 分页
        page_obj = MyCursorPagination()
        page_article = page_obj.paginate_queryset(queryset=article_list, request=request, view=self)
        ser_obj = ArticleSerializer(page_article, many=True)
        res["data"] = ser_obj.data
        # return Response(res)
        return page_obj.get_paginated_response(res)

二、相应器

restframework 自定义的

from rest_framework.response import Response

注意：在浏览器和postman显示数据的格式不一样