分页器

目录

• PageNumberPagination
• LimitOffsetPagination
• CursorPagination
• 使用APIView写分页

三种分页方式:

• PageNumberPagination
• LimitOffsetPagination
• CursorPagination

#settings.py全局配置
REST_FRAMEWORK = {
    'PAGE_SIZE': 2,
}

PageNumberPagination

# urls.py
path('books2/', views.BookListView.as_view()),#继承了ListAPIView


#views.py
from rest_framework.generics import ListAPIView
from rest_framework.pagination import PageNumberPagination, LimitOffsetPagination, CursorPagination

#重写
class MyPageNumberPagination(PageNumberPagination):
    page_size = 3  # 每页显示的条数
    # page_query_param = 'num'  # 前端发送的页数关键字，默认为'page'
    max_page_size = 5  # 每页最大显示条数
    page_size_query_param = 'size'#每一页显示的条数


class BookListView(ListAPIView):
    queryset = Book.objects.all()
    serializer_class = BookModelSerializer
    # 配置分页
    pagination_class = MyPageNumberPagination
    
    
#http://127.0.0.1:8000/api/books2/?num=2
#http://127.0.0.1:8000/api/books2/?num=2&size=6   #一页最多显示5数据

LimitOffsetPagination

# urls.py
path('books2/', views.BookListView.as_view()),#继承了ListAPIView


#views.py
class MyLimitOffsetPagination(LimitOffsetPagination):
    default_limit = 3     #每页条数
    limit_query_param = 'limit'   #往后拿几条
    offset_query_param = 'offset'   #从第几个开始
    max_limit = 5

class BookListView(ListAPIView):
    queryset = Book.objects.all()
    serializer_class = BookModelSerializer
    # 配置分页

    pagination_class = MyLimitOffsetPagination
    
#http://127.0.0.1:8000/api/books2/?offset=6&limit=2       

CursorPagination

写出来只有上一页，下一页，不能跳

# urls.py
path('books2/', views.BookListView.as_view()),#继承了ListAPIView


#views.py
class MyCursorPagination(CursorPagination):
    page_size = 2  # 每一页显示的条数
    cursor_query_param = 'cursor'  # 每一页查询的key
    ordering = '-id'  # 排序


class BookListView(ListAPIView):
    queryset = Book.objects.all()
    serializer_class = BookModelSerializer
    # 配置分页

    pagination_class = MyCursorPagination

使用APIView写分页

#urls.py
path('books3/', views.BookView.as_view()),

#views.py
from rest_framework.pagination import PageNumberPagination, LimitOffsetPagination, CursorPagination
from rest_framework.views import APIView
from rest_framework.response import Response
from app01.models import Book
from app01.serialize import BookModelSerializer

#重写
class MyPageNumberPagination(PageNumberPagination):
    page_size = 3  # 每页显示的条数
    page_query_param = 'num'  # 前端发送的页数关键字，默认为'page'
    max_page_size = 5  # 每页最大显示条数
    page_size_query_param = 'size'  # 每一页显示的条数
    
class BookView(APIView):
    def get(self, request, *args, **kwargs):
        book_list = Book.objects.all()
        # 实例化得到分页器对象
        page_cursor = MyPageNumberPagination()
        book_list = page_cursor.paginate_queryset(book_list, request, view=self)
        next_url = page_cursor.get_next_link()  # 下一页
        pre_url = page_cursor.get_previous_link()  # 上一页
        print(next_url)#打印下一页的url
        print(pre_url)#打印下一页的url
        book_ser = BookModelSerializer(book_list, many=True)
        return Response(data=book_ser.data)