restframework细节学习

def books(request):

    ll=[{‘name‘:‘python全站开发‘,‘price‘:20},{‘name‘:‘linux‘,‘price‘:30}]

    # return HttpResponse(json.dumps(ll))
    return JsonResponse(ll,safe=False,json_dumps_params={‘ensure_ascii‘:False})

from rest_framework.views import APIView

class Book(APIView):
    def get(self,request):
        # 拿原来的request对象
        # request._request
        # print(request.method)
        # print(request._request.method)
        # request.POST
        # request.method
        return HttpResponse(‘get‘)
    def post(self,request):
        print(request.method)
        print(request._request.method)
        print(request.POST)

        # 用apiview之后，再取数据，从request.data
        print(request.data)
        return HttpResponse(‘post‘)

from app01 import models
序列化组建
第一种方式
class Book(APIView):
    def get(self,request):
        response={‘status‘:100,‘msg‘:None}
        books=models.Book.objects.all()
        # ll=[]
        # for book in books:
        #     ll.append({‘name‘:book.name,‘‘})
        ll=[ {‘name‘:book.name,‘price‘:book.price} for book in books]
        response[‘msg‘]=‘查询成功‘
        response[‘data‘]=ll
        return JsonResponse(response,safe=False)

        # return HttpResponse(‘get‘)
    def post(self,request):

        return HttpResponse(‘post‘)

第二种方式,用django子自带序列化组件
from django.core import serializers

# class Book(APIView):
#     def get(self,request):
#         # response={‘status‘:100,‘msg‘:None}
#         books = models.Book.objects.all()
#         ret = serializers.serialize("json", books)
#         return HttpResponse(ret)
#
#         # return HttpResponse(‘get‘)
#     def post(self,request):
#
#         return HttpResponse(‘post‘)

# 第三种方式。drf的序列化组件

class MyResponse():
    def __init__(self):
        self.status = 100
        self.msg = None

    @property
    def get_dic(self):
        return self.__dict__

from app01 import myserial
class Book(APIVIEW):
　　def get(self,request):
　　response = MyResponse()

# 多条
  books = models.Book.objects.all()
  ret=myserial.BookSer(books,many=True)
#  一条
  book = self.queryset
  ret = myserial.BookSer(book, many=False)
  ret = self.serializer_class(instance=book, many=True)

　　response.msg = ‘查询成功‘
　　response.data = ret.data
　　return Jsonponse(response.get_dic,safe=False)

from rest_framework import serializers


class BookSer(serializers.Serializer):
    nid=serializers.IntegerField()
    name3=serializers.CharField(source=‘name‘)
    price=serializers.CharField()
    # publish_date = serializers.DateField()
    publish_date = serializers.CharField()
    # publish=serializers.CharField(source=‘publish.email‘)
    publish=serializers.CharField(source=‘publish.name‘)
    xxx=serializers.CharField(source=‘test‘)
    # authors=serializers.CharField(source=‘authors.all‘)
    # SerializerMethodField,可以写一个方法方法名叫：get_字段名字，方法返回值，会赋给authors
    aa=serializers.SerializerMethodField()
    # def get_authors(self,obj):
    #     authors=obj.authors.all()
    #     # ll=[ author.name for author in authors]
    #     ll=[ {‘name‘:author.name,‘age‘:author.age} for author in authors]
    #     return ll
    def get_aa(self, obj):
        authors = obj.authors.all()
        # ll=[ author.name for author in authors]
        ser=AuthorSer(authors,many=True)
        return ser.data

class AuthorSer(serializers.Serializer):
    id=serializers.IntegerField(source=‘nid‘)
    age=serializers.CharField()
    name=serializers.CharField()

一 restfu（规范）
    是什么：
        -面向资源编程
        -getBooklist：获取图书列表
        -符合规范的：books
    规范：
        -method：get----》books----》取到所有的书
                
                 post———》books---》新增图书
                 
                 put/patch--》books/id---》修改图书
                 
                 delete---》books/id---》删除图书
        -https://api.example.com/v1/zoos?limit=10
        -

二 drf
    安装（app）：pip3 install djangorestframework
    -基于drf写resful的接口，得写CBV
    -request对象，源码分析
    -APIView源码分析
    
    
三 序列化组件
    -1 导入：from rest_framework import serializers
    -2 写一个类（名字任意），继承serializers.Serializer
        class BookSer(serializers.Serializer):
            nid=serializers.IntegerField()
            name3=serializers.CharField(source=‘name‘)
            price=serializers.CharField()
            # publish_date = serializers.DateField()
            publish_date = serializers.CharField()
            # publish=serializers.CharField(source=‘publish.email‘)
            publish=serializers.CharField(source=‘publish.name‘)
            xxx=serializers.CharField(source=‘test‘)
    -3 如果不指定source，字段名，必须跟数据库列名一致
    -4 source--》既可以指定数据属性，又可以指定方法属性，可以写（publish.name）
    -5 使用：
        -查询出要序列化的数据：books = models.Book.objects.all()
        -ret=myserial.BookSer(books,many=True)-----》多条（queryset对象），必须指定many=True
        -ret=myserial.BookSer(books,many=False)-----》一条（Book对象），必须指定many=False
    -6 aa=serializers.SerializerMethodField()
        -必须配套一个方法（get_aa(self,obj)）,方法返回结果，会赋给aa
        -在方法内部，可以继续用序列化组件