标签:ted djang 维护 使用 前端 serialize get 概念 继承
############### 分页组件 ###############
# 分页组件 # # django也有分页,rest framework也有分页,但是没有页面这个概念了, # 这个分页是返回给前端数据太多的时候,需要分页返回, # http://127.0.0.1:8000/books/?page=1, # 我们需要把继承这个分页类,然后重写一些方法, # class MyPageNumberPagination(PageNumberPagination): # page_size =2 # page_query_param = "page" # page_size_query_param = "size" # ##################################### # http://127.0.0.1:8000/books/?page=1&size=1 # 默认显示两个,但是可以自己指定显示几个, # ######################################### # http://127.0.0.1:8000/books/?limit=3 # http://127.0.0.1:8000/books/?limit=3&offset=1,这是偏移, # ############################################# # pagination_class = MyPageNumberPagination # 这视图里面加上这一句,就会去找我们定义的视图类了, # 所以分页器的使用,就是定义一个分页的类,然后加一句,就可以了,
############### 第一种分页器:PageNumberPagination ###############
按页码数分页,第n页,每页显示m条数据
例如:http://127.0.0.1:8000/api/article/?page=2&size=1
分页器:
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
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 = MyPageNumber() 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)
返回带页码链接的响应:
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 = MyPageNumber() 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 page_obj.get_paginated_response(res)
############### 第二种分页器:LimitOffsetPagination ###############
分页,在n位置,向后查看m条数据
例如:http://127.0.0.1:8000/api/article/?offset=2&limit=2
分页器:
# offset分页 class MyLimitOffset(LimitOffsetPagination): default_limit = 1 limit_query_param = ‘limit‘ offset_query_param = ‘offset‘ max_limit = 999
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 = MyLimitOffset() 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 page_obj.get_paginated_response(res)
############### 第三种分页器:CursorPagination ###############
加密分页,把上一页和下一页的id值记住
分页器:
# 加密分页 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)
############### 分页组件 ###############
标签:ted djang 维护 使用 前端 serialize get 概念 继承
原文地址:https://www.cnblogs.com/andy0816/p/12293732.html