分页、排序、过滤。

过滤的时候需要下载：
pip install django-filter

序列化：
ModelSerializer:

  from rest_framework import serializers
  from demoapp import models as dm1model
  class UserSer(serializers.ModelSerializer):
  class Meta:
  # 指定模型类
  model = dm1model.User
  # 指定序列化字段
  fields = "__all__" #所有字段
  fields = ("username","home") #其中某⼏个字段
  # 序列化深度，是否序列化外键
  depth = 1
  # 只序列化字段
  read_only_fields = ('id', 'bread', 'bcomment')
  # 额外参数，修改字段设置
  extra_kwargs = {
        'age': {'min_value': 0, 'required': True},
        'hight': {'min_value': 0, 'required': True},
  }

路由：
urls.py:

  from django.urls import path, include, re_path
  from app03.views import *
  from rest_framework.routers import DefaultRouter
  router = DefaultRouter()
  router.register('user', UserModelView)
  urlpatterns = [
      path("", include(router.urls)),
      # path('adduser/', UserModelView.as_view()),
  ]

过滤+排序

settings.py:

  INSTALLED_APPS = [
   ...
   'django_filters', # 需要注册应⽤，
  ]
  REST_FRAMEWORK = {
      'DEFAULT_FILTER_BACKENDS':
          (
              'django_filters.rest_framework.DjangoFilterBackend',  # 过滤
              'rest_framework.filters.OrderingFilter',  # 排序
          )
  }

views.py:

  from rest_framework.viewsets import ModelViewSet
  from userapp import models as userapp
  from app03 import serializers as app03
  from django_filters.rest_framework import DjangoFilterBackend  # Django自带的过滤
  from rest_framework.filters import OrderingFilter  # Django自带的排序


  class UserModelView(ModelViewSet):
       queryset = userapp.User.objects.all()
       serializer_class = app03.UserSer
       # filter_backends = [OrderingFilter,DjangoFilterBackend]
       ordering_fields = ("age", "hight")
       filter_fields = ("username", "age", "home")

  路由格式：http://127.0.0.1:8000/app03/user/?ordering=hight&home=羊村

过滤：

settings.py:

  REST_FRAMEWORK = {
      'DEFAULT_FILTER_BACKENDS':
          (
              'django_filters.rest_framework.DjangoFilterBackend',  # 过滤
          )
  }

  views.py:
  from rest_framework.viewsets import ModelViewSet
  from userapp import models as userapp
  from app03 import serializers as app03
  from django_filters.rest_framework import DjangoFilterBackend  # Django自带的过滤


  # 使⽤全局过滤器
  class UserModelView(ModelViewSet):
      queryset = userapp.User.objects.all()
      serializer_class = app03.UserSer
      filter_fields = ("username", "age", "home")

  # 局部使⽤过滤器
  class UserModelView(ModelViewSet):
      queryset = userapp.User.objects.all()
      serializer_class = app03.UserSer
      filter_backends = [DjangoFilterBackend]  # 申明配置过滤器
      filter_fields = ("username", "age", "home")

  路由格式：http://127.0.0.1:8000/app03/user/?age=3&home=1

排序

settings.py:

  REST_FRAMEWORK = {
      'DEFAULT_FILTER_BACKENDS':
          (
              'rest_framework.filters.OrderingFilter',  # 排序
          )
  }

views.py:

  from rest_framework.viewsets import ModelViewSet
  from userapp import models as userapp
  from app03 import serializers as app03
  from rest_framework.filters import OrderingFilter  # Django自带的排序

  # 全局
  class UserModelView(ModelViewSet):
      queryset = userapp.User.objects.all()
      serializer_class = app03.UserSer
      ordering_fields = ("age", "hight")
  # 局部
  class UserModelView(ModelViewSet):
  queryset = userapp.User.objects.all()
  serializer_class = app03.UserSer
  filter_backends = [OrderingFilter]


  路由格式：http://127.0.0.1:8000/app03/user/?ordering=hight

分页：

settings.py:

  REST_FRAMEWORK = {
      # 分页配置
      'DEFAULT_PAGINATION_CLASS':
          'rest_framework.pagination.PageNumberPagination',
          'PAGE_SIZE': 3  # 每页的数据量
  }

views.py:

  from rest_framework.viewsets import ModelViewSet
  from rest_framework.pagination import PageNumberPagination  # Django自带的分页
  class MyPage(PageNumberPagination):
      page_size_query_param = "max_page"
      page_query_param = "page"


  class UserModelView(ModelViewSet):
      queryset = userapp.User.objects.all()
      serializer_class = app03.UserSer
      pagination_class = MyPage

  路由格式：http://127.0.0.1:8000/app03/user/?max_page=3&page=1