分页
PageNumberPagination
配置settings.py
REST_FRAMEWORK = { "PAGE_SIZE":2 }在视图的列表页面
from rest_framework.pagination import PageNumberPagination from rest_framework import serializers class PageArticleSerializer(serializers.ModelSerializer): class Meta: model = models.Article fields = "__all__" class PageArticleView(APIView): def get(self,request,*args,**kwargs): queryset =models.Article.objects.all() # 方式一：仅数据 """ # 分页对象 page_object = PageNumberPagination() # 调用 分页对象.paginate_queryset方法进行分页，得到的结果是分页之后的数据 # result就是分完页的一部分数据 result = page_object.paginate_queryset(queryset,request,self) # 序列化分页之后的数据 ser = PageArticleSerializer(instance=result,many=True) return Response(ser.data) """ #方式二：数据+分页信息 """ page_object=PageNumberPagination() result=page_object.paginate_queryset(queryset,request,self) ser=PageArticleSerializer(instance=result,many=True) return page_object.get_paginated_response(ser.data) """ #方式三：数据+部分分页信息 page_object=PageNumberPagination() result=page_object.paginate_queryset(queryset,request,self) ser=PageArticleSerializer(instance=result,many=True) return Response({'count':page_object.page.paginator.count,'result':ser.data})
LimitOffffsetPagination
from rest_framework.pagination import PageNumberPagination
from rest_framework.pagination import LimitOffsetPagination
from rest_framework import serializers
class PageArticleSerializer(serializers.ModelSerializer):
class Meta:
model = models.Article
fields = "__all__"
class HulaLimitOffsetPagination(LimitOffsetPagination):
max_limit = 2
class PageArticleView(APIView):
def get(self,request,*args,**kwargs):
queryset = models.Article.objects.all()
page_object = HulaLimitOffsetPagination()
result = page_object.paginate_queryset(queryset, request, self)
ser = PageArticleSerializer(instance=result, many=True)
return Response(ser.data)
扩展
DRF中有内置的serializer和PageNumberPagination方法
urls.py url(r'^page/view/article/$', views.PageViewArticleView.as_view()),
views.py
from rest_framework.generics import ListAPIView
class PageViewArticleSerializer(serializers.ModelSerializer):
class Meta:
model = models.Article
fields = "__all__" class
PageViewArticleView(ListAPIView):
queryset = models.Article.objects.all()
serializer_class = PageViewArticleSerializer ##内置序列化功能，但是序列化函数和功能需要自己定义
## DRF内置了分页功能，需要自己配置。
settings.py
REST_FRAMEWORK = {
"PAGE_SIZE":2,
"DEFAULT_PAGINATION_CLASS":"rest_framework.pagination.PageNumberPagination"
}
## 也可在类的下面写
PageViewArticleView(ListAPIView):
queryset = models.Article.objects.all()
serializer_class = PageViewArticleSerializer
pagination_class = PageNumberPagination
小知识扩展：类的约束
# 约束子类中必须实现f1
class Base(object):
def f1(self):
raise NotImplementedError('asdfasdfasdfasdf')
class Foo(Base):
def f1(self):
print(123)
obj = Foo()
obj.f1()
筛选
这里我们先做个练习
model表
class UserInfo(models.Model):
""" 用户表 """
username = models.CharField(verbose_name='用户名',max_length=32)
password = models.CharField(verbose_name='密码',max_length=64)
class Article(models.Model):
""" 文章表 """
category_choices = (
(1,'咨询'),
(2,'公司动态'),
(3,'分享'),
(4,'答疑'),
(5,'其他'),
)
category = models.IntegerField(verbose_name='分类',choices=category_choices)
title = models.CharField(verbose_name='标题',max_length=32)
image = models.CharField(verbose_name='图片路径',max_length=128) # /media/upload/....
summary = models.CharField(verbose_name='简介',max_length=255)
comment_count = models.IntegerField(verbose_name='评论数',default=0)
read_count = models.IntegerField(verbose_name='浏览数',default=0)
author = models.ForeignKey(verbose_name='作者',to='UserInfo')
date = models.DateTimeField(verbose_name='创建时间',auto_now_add=True)
serializer
class ArticleListSerializer(serializers.ModelSerializer):
class Meta:
model = models.Article
fields = "__all__"
views.py
from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework import serializers
from rest_framework.pagination import PageNumberPagination
from . import models
class ArticleView(APIView):
def get(self,requset,*args,**kwargs)
""" 获取文章列表 """
pk = kwargs.get('pk')
# 全部数据
if not pk:
# 判断用户选择了哪个板块，并筛选出该板块的全部数据，返回给用户
condition = {}
category = request.query_params.get('category')
if category:
condition['category'] = category
queryset = models.Article.objects.filter(**condition)
pager = PageNumberPagination()
result = pager.paginate_queryset(queryset,request,self)
ser = ArticleListSerializer(instance=result,many=True)
return Response(ser.data)
# 单条数据
article_object = models.Article.objects.filter(id=pk).first()
ser = PageArticleSerializer(instance=article_object,many=False)
return Response(ser.data)
DRF内置筛选功能
上面的方法没有错，但是开发的时候很麻烦，DRF内部内置了筛选功能，供我们使用
---------正常使用---------
from rest_framework.generics import
from rest_framework.views import APIView
from rest_framework.filters import BaseFilterBackend
from rest_framework import serializers
from rest_framework.pagination import PageNumberPagination
class ArticleFilterBackend(BaseFilterBackend)
def filter_queryset(self,request,queryset,view)
val = request.query_params('cagetory')
return queryset.filter(cagetory=val)
class ArticleView(APIView):
""" 获取文章列表 """
pk = kwargs.get('pk')
# 全部数据
if not pk:
# 判断用户选择了哪个板块，并筛选出该板块的全部数据，返回给用户
queryset = models.Article.objects.all()
obj = ArticleFilterBackend()
# 筛选之后的queryset
queryset = obj.filter_queryset(request,queryset,self)
pager = PageNumberPagination()
result = pager.paginate_queryset(queryset,request,self)
ser = ArticleListSerializer(instance=result,many=True)
return Response(ser.data)
# 单条数据
article_object = models.Article.objects.filter(id=pk).first()
ser = PageArticleSerializer(instance=article_object,many=False)
return Response(ser.data)
---------使用内置筛选---------
class ArticleView(APIView):
""" 获取文章列表 """
queryset = models.News.objects.all()
serializer_class = NewSerializers
pagination_class = PageNumberPagination
filter_backends = [NewFilterBackend, ] ###内置筛选功能