django-admin  startprojet  drf 

python manage.py  startapp  app1

python manage.py  startapp  book

INSTALLED_APPS = [
    ‘django.contrib.admin‘,
    ‘django.contrib.auth‘,
    ‘django.contrib.contenttypes‘,
    ‘django.contrib.sessions‘,
    ‘django.contrib.messages‘,
    ‘django.contrib.staticfiles‘,
    ‘book‘,
    ‘app1‘,
]

# 连接数据库

DATABASES = {
    ‘default‘: {
        ‘ENGINE‘: ‘django.db.backends.mysql‘,
        ‘NAME‘: ‘book‘, # 数据库名
        ‘HOST‘:‘127.0.0.1‘,
        ‘PORT‘:3306,
        ‘USER‘:‘root‘,
        ‘PASSWORD‘:‘123‘  # 这里必须为字符串
    }
}

import pymysql

pymysql.install_as_MySQLdb()

from django.db import models

# Create your models here.

class Book(models.Model):

    title = models.CharField(max_length=32,verbose_name=‘书名‘)

    pub_date = models.DateField(verbose_name=‘出版日期‘)

    bread = models.IntegerField(verbose_name=‘阅读量‘)

    bcomment = models.IntegerField(verbose_name=‘评论数‘)

    class Meta:

        db_table =‘book‘

    def __str__(self):

        return self.title


class Hero(models.Model):

    name = models.CharField(max_length=32,verbose_name=‘名字‘)

    age = models.IntegerField(verbose_name=‘年龄‘)


    class Meta:

        db_table=‘人物‘


    def __str__(self):

        return self.name

python manage.py  makemigrations

python manage.py  migrate

from rest_framework import serializers

from book.models import Book,Hero


class BookModelSerializer(serializers.ModelSerializer):

    class Meta:
        model = Book

        fields=‘__all__‘

        # 可以给模型序列化器里面指定的字段设置限制选项
        extra_kwargs = {
            ‘bread‘:{‘min_value‘:0,‘required‘:True}
        }

class HeroModelSerializer(serializers.ModelSerializer):

    class Meta:
        model = Hero

        fields = ‘__all__‘

from django.shortcuts import render

# Create your views here.
from rest_framework.decorators import action
from rest_framework.response import Response
from rest_framework.viewsets import ModelViewSet
from app1.serializers import BookModelSerializer, HeroModelSerializer
from book.models import Book, Hero


class BookModelViewSet(ModelViewSet):
    queryset = Book.objects.all()
    serializer_class = BookModelSerializer

    @action(methods=[‘get‘],detail=False)#detail=False 是否为详情页数据
    def get_top_5(self,request):  # 其接口 http://127.0.0.1:8000/app1/book/get_top_5/
        # 获取阅读量最多的5条数据
        books = Book.objects.order_by(‘-bread‘)[:5] # 取阅读量为前5的书籍

        serializer = BookModelSerializer(instance=books,many=True)

        return Response(serializer.data)

    # action是drf提供的路由和视图方法绑定关系的装饰器
    # from rest_framework.decorators import action
    # 参数1: methods 列表，设置视图方法允许哪些http请求访问进来
    # 参数2: detail  当前是否方法是否属于详情页视图，
    #        False，系统不会自动增加pk在生成的路由地址中
    #        True  则系统会自动增加pk在生成的路由地址
    @action(methods=[‘get‘,‘post‘],detail=True)
    def get_one_title(self,request,pk):

        book = Book.objects.get(pk=pk)

        return Response(book.btitle)

class HeroModelViewSet(ModelViewSet):

    queryset = Hero.objects.all()

    serializer_class = HeroModelSerializer

from rest_framework import routers

from app1.views import BookModelViewSet, HeroModelViewSet

urlpatterns=[]

router = routers.DefaultRouter() # 开发环境用，有主界面
# router = routers.SimpleRouter() # 生产环境用

router.register(‘book‘,BookModelViewSet)
router.register(‘hero‘,HeroModelViewSet)

urlpatterns += router.urls

from django.contrib import admin
from django.urls import path,include


urlpatterns = [
    path(‘admin/‘, admin.site.urls),
    path(‘app1/‘,include(‘app1.urls‘))
]