1、入门

1.1 参考blog

官方文档：http://www.django-rest-framework.org/tutorial/quickstart/#quickstart

yuan的Blog：http://www.cnblogs.com/yuanchenqi/articles/8719520.html

alice的Blog：https://www.cnblogs.com/alice-bj/p/9228402.html

1.2 restful协议

restful协议

---- 一切皆是资源,操作只是请求方式

----book表增删改查     /books/                 books     /books/add/             addbook     /books/(\d+)/change/    changebook     /books/(\d+)/delete/    delbook

----book表增删改查  url里面不能出现动词！！     /books/     -----get            books      -----  返回当前所有数据     /books/     -----post           books      -----  返回提交数据

     /books/(\d+)-----get            bookdetail -----  返回当前查看的单条数据     /books/(\d+)-----put            bookdetail -----  返回更新数据     /books/(\d+)-----delete         bookdetail -----  返回空

1.3 安装

pip install django

pip install djangorestframework

2. 序列化方法

序列化是什么？ QuerySet-->list-->json

2.1 restdemo

model

from django.db import modelsclass Book(models.Model):title=models.CharField(max_length=32)price=models.IntegerField()pub_date=models.DateField()publish=models.ForeignKey("Publish",on_delete=models.CASCADE)authors=models.ManyToManyField("Author")def __str__(self):return self.titleclass Publish(models.Model):name=models.CharField(max_length=32)email=models.EmailField()def __str__(self):return self.nameclass Author(models.Model):name=models.CharField(max_length=32)age=models.IntegerField()def __str__(self):return self.name

url

from django.contrib import admin
from django.urls import pathfrom app01 import viewsurlpatterns = [path('admin/', admin.site.urls),path('publishes/', views.PublishView.as_view()),
]

view

from django.shortcuts import render,HttpResponse# Create your views here.
from django.views import Viewfrom .models import Publish
import jsonclass PublishView(View):def get(self,request):# QuerySet-->vales取值--->list--->jsonpublish_list = list(Publish.objects.all().values("name","email"))return HttpResponse(json.dumps(publish_list))def post(self,request):pass

database

　　

data生成与迁移

　　python manage.py makemigrations

　　python manage.py migrate

运行django项目

　　

2.2 方式1 ：list()

2.3 方式2：model_to_dict(obj)

2.4 方式3：django serializers

2.5 方式4 ：restframework  serializers （推荐）

2.6 code

from django.shortcuts import render,HttpResponse# 为queryset,model对象做序列化
from rest_framework import serializers  # rest_framework的序列化组件class PublishSerializers(serializers.Serializer):# 对哪些字段序列化name = serializers.CharField()email = serializers.EmailField()from django.views import View
from .models import Publish
import jsonclass PublishView(View):def get(self,request):# QuerySet--->list--->json# 序列化方式1  # list()# publish_list = list(Publish.objects.all().values("name","email"))#return HttpResponse(json.dumps(publish_list))# 序列化方式2  # model对象转换为dict# from django.forms.models import model_to_dict# publish_list = Publish.objects.all()# temp = []# for obj in publish_list:#
        #     temp.append(model_to_dict(obj))#
        #     # temp.append({#     #     "name":obj.name,#     #     "email":obj.email#     # })#
        # return HttpResponse(temp)#
# 序列化方式3   # django的序列化组件# from django.core import serializers# publish_list = Publish.objects.all()# ret = serializers.serialize("json",publish_list)#
        # return HttpResponse(ret)# 序列化方式4  rest_framework的序列化组件publish_list = Publish.objects.all()ret = PublishSerializers(publish_list,many=True)return HttpResponse(ret.data)def post(self,request):pass

3.取数据:APIView

3.1 Django的原生request

1.get取数据

2.post取数据

 

3. request实质就是http报文头

    (1)Django的原生request:浏览器   -------------  服务器"GET url?a=1&b=2 http/1.1\r\user_agent:Google\r\ncontentType:urlencoded\r\n\r\n""POST url http/1.1\r\user_agent:Google\r\ncontentType:urlencoded\r\n\r\na=1&b=2"request.body: a=1&b=2request.POST:if contentType:urlencoded:a=1&b=2----->{"a":1,"b":2}

4.发送json

3.2 原生request源码

content-type

3.3 restframework下的 APIView

1. 新的request 取数据

2. urlencoded类型的data

3. get请求

3.3 APIView源码

1. 继承了基本的View

2. APIView下的dispatch

 

3.4 view代码

get:

　　request._request ( 原request )

　　request.GET == request._request.GET

post:

　　request.data ( 得到 json 数据，也可得到 urlencode 数据)

　　　　都是 rest_framework  APIView 的功劳，

　　如果使用 View , request.post( 只能得到 urlencode 的数据，不能得到 json 数据，只能从 request.body 中取)

from django.shortcuts import render,HttpResponse

from django.views import Viewfrom rest_framework.views import APIView# class PublishView(View):    # 原生View
class PublishView(APIView):   # APIViewdef get(self,request):# 取数据print("request.data  ",request.data)print("request.data type  ",type(request.data))print(request._request.GET)  #旧的requestprint(request.GET)return HttpResponse("123")def post(self,request):# 取数据# 1 原生reqeust支持的操作# print("post...",request.POST)# print("body...",request.body)# print(type(request))  # <class 'django.core.handlers.wsgi.WSGIRequest'># from django.core.handlers.wsgi import WSGIRequest# 2 新的reqeust支持的操作# request._request.POST  # 取出旧的requestprint("request.data  ",request.data)print("request.data type  ",type(request.data))return HttpResponse("POST")

4. 序列化字段:Serializer

4.1 准备demo

1. views

from django.shortcuts import render,HttpResponse# 为queryset,model对象做序列化
from rest_framework import serializers  # rest_framework的序列化组件
class PublishSerializers(serializers.Serializer):# 对哪些字段序列化name = serializers.CharField()email = serializers.EmailField()# 为Book做序列化
class BookSerializers(serializers.Serializer):title = serializers.CharField(max_length=32)price = serializers.IntegerField()pub_date = serializers.DateField()from rest_framework.views import APIView
class PublishView(APIView):   # APIViewdef get(self,request):return HttpResponse("123")def post(self,request):return HttpResponse("POST")from .models import Book
class BookView(APIView):def get(self,request):book_list = Book.objects.all()bs = BookSerializers(book_list,many=True)return HttpResponse(bs.data)def post(self,request):pass

2. database

Question报错：

　　return datetime.date(*map(int, val.split(b"-")))
　　OverflowError: Python int too large to convert to C long

原因：估计是sqlite中datetime的问题

　　　　

解决办法：创建superuser，进入admin页面，添加书籍，生成到数据库的data

　　　　   　　

4.2 响应器 response

""" 响应器
针对 不同得访问者 浏览器 postman 做不同得处理
只有浏览器，用户 会给一个页面！！

几种请求方式
get post
get put delete
"""

1.Response继承了HttpResponse

2. restframework就是一个app，需要注册

    

3.get得到的data实质

4.3 默认打印__str__定制的字段

      

    # publish = serializers.CharField()  # 默认打印 __str__定义的字段名publish = serializers.CharField(source="publish.name")

5. 如何一对多显示

  

    # 一对多# authors = serializers.CharField(source="authors.all")  #"authors": "<QuerySet [<Author: alex>, <Author: yuan>]>"authors = serializers.SerializerMethodField()def get_authors(self,obj):temp = []for obj in obj.authors.all():temp.append(obj.name)return temp

4.4 序列化的过程

"""
序列化BookSerializers(book_list,many=True)过程temp = []for obj in book_list:temp.append({"title":obj.title,"price":obj.price,"pub_date":obj.pub_date,"publish":str(obj.publish),  # obj.publish.name"authors":get_authors(obj)})return HttpResponse(temp)"""

4.5 code代码

view

from django.shortcuts import render,HttpResponse# 为queryset,model对象做序列化
from rest_framework import serializers  # rest_framework的序列化组件class PublishSerializers(serializers.Serializer):# 对哪些字段序列化name = serializers.CharField()email = serializers.EmailField()# 为Book做序列化
class BookSerializers(serializers.Serializer):title = serializers.CharField(max_length=32)price = serializers.IntegerField()pub_date = serializers.DateField()# publish = serializers.CharField()  # 默认打印 __str__定义的字段名publish = serializers.CharField(source="publish.name")# 一对多# authors = serializers.CharField(source="authors.all")  #"authors": "<QuerySet [<Author: alex>, <Author: yuan>]>"authors = serializers.SerializerMethodField()def get_authors(self,obj):temp = []for obj in obj.authors.all():temp.append(obj.name)return tempfrom rest_framework.views import APIView
class PublishView(APIView):   # APIViewdef get(self,request):return HttpResponse("123")def post(self,request):return HttpResponse("POST")from .models import Book
from rest_framework.response import Responseclass BookView(APIView):def get(self,request):book_list = Book.objects.all()bs = BookSerializers(book_list,many=True)# return HttpResponse(bs.data)return Response(bs.data)  # Response继承HttpResponsedef post(self,request):pass

5.序列化模型：ModelSerializers

5.1 以Book为例

from django.shortcuts import render,HttpResponsefrom .models import Bookfrom rest_framework import serializers  # rest_framework的序列化组件
from rest_framework.views import APIView
from rest_framework.response import Responseclass BookModelSerializers(serializers.ModelSerializer):  # ModelSerializerclass Meta:model = Bookfields = '__all__'class BookView(APIView):def get(self,request):book_list = Book.objects.all()bs = BookModelSerializers(book_list,many=True)return Response(bs.data)  # Response继承HttpResponsedef post(self,request):passclass PublishSerializers(serializers.Serializer):# 对哪些字段序列化name = serializers.CharField()email = serializers.EmailField()class PublishView(APIView):   # APIViewdef get(self,request):return HttpResponse("123")def post(self,request):return HttpResponse("POST")

5.2 get请求：显示书籍，自定制

自定制字段的source

     

    # 如何显示字段publish = serializers.CharField(source="publish.name")   # 原生的create不接受自定制，需要重写create方法
authors = serializers.SerializerMethodField(source="authors.all")def get_authors(self,obj):temp = []for obj in obj.authors.all():temp.append(obj.name)return temp

5.3 post请求，保存书籍

1. 取消自定制的，source

create方法中没有source自定义

    def post(self,request):# post请求的数据bs = BookModelSerializers(data=request.data)if bs.is_valid():print(bs.validated_data)bs.save()  # create方法return Response(bs.data)else:return Response(bs.errors)

2. 源码create

3. 发送json数据，提交到database

  

5.4 重写create方法

原生的create不接受自定制，需要重写create方法

class BookModelSerializers(serializers.ModelSerializer):  # ModelSerializerclass Meta:model = Bookfields = '__all__'# 如何显示字段publish = serializers.CharField(source="publish.name")   # 原生的create不接受自定制，需要重写create方法# 重写create方法  # 不接受自定制字段，sourcedef create(self, validated_data):print("validated_data...",validated_data)book = Book.objects.create(title=validated_data['title'],price=validated_data['price'],pub_date=validated_data['pub_date'],publish_id=validated_data['publish']['name'])book.authors.add(*validated_data['authors'])return book

6.单条数据(get,put,delete)

6.1 解耦：新建serializer.py

1.serializer.py

from rest_framework import serializers  # rest_framework的序列化组件from .models import Bookclass PublishSerializers(serializers.Serializer):name = serializers.CharField()email = serializers.EmailField()class BookModelSerializers(serializers.ModelSerializer):  # ModelSerializerclass Meta:model = Bookfields = '__all__'

2. view.py

from django.shortcuts import render,HttpResponsefrom rest_framework.views import APIView
from rest_framework.response import Responsefrom app01.serilizer import BookModelSerializers  # 从serilizer中导入from .models import Bookclass PublishView(APIView):   # APIViewdef get(self,request):return HttpResponse("123")def post(self,request):return HttpResponse("POST")class BookView(APIView):def get(self,request):book_list = Book.objects.all()bs = BookModelSerializers(book_list,many=True)return Response(bs.data)  # Response继承HttpResponsedef post(self,request):# post请求的数据bs = BookModelSerializers(data=request.data)if bs.is_valid():print(bs.validated_data)bs.save()  # create方法return Response(bs.data)else:return Response(bs.errors)

6.2 单条数据demo

urls:正则表达式用re_path

from django.contrib import admin
from django.urls import path
from django.urls import re_path  # 正则表达式的from app01 import viewsurlpatterns = [path('admin/', admin.site.urls),path('publishes/', views.PublishView.as_view()), # view(request)====> APIView:dispatch()path('books/', views.BookView.as_view()),re_path(r'books/(\d+)/$', views.BookDetailView.as_view()),
]

view

from django.shortcuts import render,HttpResponsefrom rest_framework.views import APIView
from rest_framework.response import Responsefrom app01.serilizer import BookModelSerializers  # 从serilizer中导入from .models import Bookclass PublishView(APIView):   # APIViewdef get(self,request):return HttpResponse("123")def post(self,request):return HttpResponse("POST")class BookView(APIView):def get(self,request):book_list = Book.objects.all()bs = BookModelSerializers(book_list,many=True)return Response(bs.data)  # Response继承HttpResponsedef post(self,request):# post请求的数据bs = BookModelSerializers(data=request.data)if bs.is_valid():print(bs.validated_data)bs.save()  # create方法return Response(bs.data)else:return Response(bs.errors)class BookDetailView(APIView):def get(self,request,id):# 获取某本书的信息book = Book.objects.filter(pk=id).first()  # 过滤单挑databs = BookModelSerializers(book)return Response(bs.data)def put(self,rquest,id):# 更新某本书的字段book = Book.objects.filter(pk=id).first()bs = BookModelSerializers(book,data=rquest.data)if bs.is_valid():bs.save()  # 实质create方法return Response(bs.data)else:return Response(bs.errors)def delete(self,request,id):# 删除某条数据Book.objects.filter(pk=id).delete()return Response("Delete 第%s本书成功"%(id))

get取数据

更新data

{ "title": "野兽绅士","price": 88, "pub_date": "2019-07-23","publish": 2,"authors": [1,2]}

   

delete

7.超链接API

7.1 配置publish为单条数据

urls

from django.contrib import admin
from django.urls import path
from django.urls import re_path  # 正则表达式的from app01 import viewsurlpatterns = [path('admin/', admin.site.urls),path('publishes/', views.PublishView.as_view()), # view(request)====> APIView:dispatch()re_path(r'publishes/(\d+)/$', views.PublishDetailView.as_view()),path('books/', views.BookView.as_view()),re_path(r'books/(\d+)/$', views.BookDetailView.as_view()),
]

View Code

serilizer

from rest_framework import serializers  # rest_framework的序列化组件from .models import Book,Publishclass PublishSerializers(serializers.Serializer):name = serializers.CharField()email = serializers.EmailField()class BookModelSerializers(serializers.ModelSerializer):  # ModelSerializerclass Meta:model = Bookfields = '__all__'class PublishModelSerializers(serializers.ModelSerializer):  # ModelSerializerclass Meta:model = Publishfields = '__all__'

View Code

views

from django.shortcuts import render,HttpResponsefrom rest_framework.views import APIView
from rest_framework.response import Responsefrom app01.serilizer import BookModelSerializers  # 从serilizer中导入
from app01.serilizer import PublishModelSerializers  #

from .models import Book,Publishclass PublishView(APIView):   # APIViewdef get(self,request):publish_list = Publish.objects.all()ps = PublishModelSerializers(publish_list,many=True)return Response(ps.data)def post(self,request):ps = PublishModelSerializers(data=request.data)if ps.is_valid():ps.save()return Response(ps.data)else:return Response(ps.errors)class PublishDetailView(APIView):def get(self,request,id):# 获取某publish的信息publish = Publish.objects.filter(pk=id).first()ps = PublishModelSerializers(publish)return Response(ps.data)def put(self,request,id):# 更新某pub的信息publish = Publish.objects.filter(pk=id).first()ps = PublishModelSerializers(publish,data=request.data)if ps.is_valid():ps.save()return Response(ps.data)else:return Response(ps.errors)def delete(self,request,id):# 删除某天publishPublish.objects.filter(pk=id).delete()return Response("Delete 第%s个出版社"%(id))class BookView(APIView):def get(self,request):book_list = Book.objects.all()bs = BookModelSerializers(book_list,many=True)return Response(bs.data)  # Response继承HttpResponsedef post(self,request):# post请求的数据bs = BookModelSerializers(data=request.data)if bs.is_valid():print(bs.validated_data)bs.save()  # create方法return Response(bs.data)else:return Response(bs.errors)class BookDetailView(APIView):def get(self,request,id):# 获取某本书的信息book = Book.objects.filter(pk=id).first()  # 过滤单挑databs = BookModelSerializers(book)return Response(bs.data)def put(self,rquest,id):# 更新某本书的字段book = Book.objects.filter(pk=id).first()bs = BookModelSerializers(book,data=rquest.data)if bs.is_valid():bs.save()  # 实质create方法return Response(bs.data)else:return Response(bs.errors)def delete(self,request,id):# 删除某条数据Book.objects.filter(pk=id).delete()return Response("Delete 第%s本书成功"%(id))

View Code

7.2 配置超链接

1.效果图

2.urls

3.serilizer中，定义超链接

4.view中id修改pk

5. view中调用 Serializers的地方，重新什么request

7.3 code代码

urls

from django.contrib import admin
from django.urls import path
from django.urls import re_path  # 正则表达式的from app01 import viewsurlpatterns = [path('admin/', admin.site.urls),path('publishes/', views.PublishView.as_view()), # view(request)====> APIView:dispatch()re_path(r'publishes/(?P<pk>\d+)/$', views.PublishDetailView.as_view(),name="detailPublish"),path('books/', views.BookView.as_view()),re_path(r'books/(\d+)/$', views.BookDetailView.as_view()),
]

View Code

views

from django.shortcuts import render,HttpResponsefrom rest_framework.views import APIView
from rest_framework.response import Responsefrom app01.serilizer import BookModelSerializers  # 从serilizer中导入
from app01.serilizer import PublishModelSerializers  #

from .models import Book,Publishclass PublishView(APIView):   # APIViewdef get(self,request):publish_list = Publish.objects.all()ps = PublishModelSerializers(publish_list,many=True)return Response(ps.data)def post(self,request):ps = PublishModelSerializers(data=request.data)if ps.is_valid():ps.save()return Response(ps.data)else:return Response(ps.errors)class PublishDetailView(APIView):def get(self,request,pk):# 获取某publish的信息publish = Publish.objects.filter(pk=pk).first()ps = PublishModelSerializers(publish)return Response(ps.data)def put(self,request,pk):# 更新某pub的信息publish = Publish.objects.filter(pk=pk).first()ps = PublishModelSerializers(publish,data=request.data)if ps.is_valid():ps.save()return Response(ps.data)else:return Response(ps.errors)def delete(self,request,pk):# 删除某天publishPublish.objects.filter(pk=pk).delete()return Response("Delete 第%s个出版社"%(pk))class BookView(APIView):def get(self,request):book_list = Book.objects.all()bs = BookModelSerializers(book_list,many=True,context={'request':request})return Response(bs.data)  # Response继承HttpResponsedef post(self,request):# post请求的数据bs = BookModelSerializers(data=request.data,context={'request':request})if bs.is_valid():print(bs.validated_data)bs.save()  # create方法return Response(bs.data)else:return Response(bs.errors)class BookDetailView(APIView):def get(self,request,id):# 获取某本书的信息book = Book.objects.filter(pk=id).first()  # 过滤单挑databs = BookModelSerializers(book,context={'request':request})return Response(bs.data)def put(self,request,id):# 更新某本书的字段book = Book.objects.filter(pk=id).first()bs = BookModelSerializers(book,data=request.data,context={'request':request})if bs.is_valid():bs.save()  # 实质create方法return Response(bs.data)else:return Response(bs.errors)def delete(self,request,id):# 删除某条数据Book.objects.filter(pk=id).delete()return Response("Delete 第%s本书成功"%(id))

View Code

serilizer

from rest_framework import serializers  # rest_framework的序列化组件from .models import Book,Publishclass PublishSerializers(serializers.Serializer):name = serializers.CharField()email = serializers.EmailField()class BookModelSerializers(serializers.ModelSerializer):  # ModelSerializerclass Meta:model = Bookfields = '__all__'# 显示超链接,在Book下的publishpublish = serializers.HyperlinkedIdentityField(view_name="detailPublish", # 别名 含正则表达式lookup_field="publish_id",   # publish_id替换pklookup_url_kwarg="pk",    # url中的pk
    )class PublishModelSerializers(serializers.ModelSerializer):  # ModelSerializerclass Meta:model = Publishfields = '__all__'

View Code

8. 今日总结

day 96CBV与FBVrestful协议----  一切皆是资源,操作只是请求方式----book表增删改查/books/                 books/books/add/             addbook/books/(\d+)/change/    changebook/books/(\d+)/delete/    delbook----book表增删改查/books/     -----get            books      -----  返回当前所有数据/books/     -----post           books      -----  返回提交数据 /books/(\d+)-----get            bookdetail -----  返回当前查看的单条数据 /books/(\d+)-----put            bookdetail -----  返回更新数据 /books/(\d+)-----delete         bookdetail -----  返回空class  Books(View):def get(self,request):pass  # 查看所有书籍def post(self,request)：pass  # 添加书籍class  BooksDetail(View):def get(self,request,id):pass  # 查看具体书籍def put(self,request,id):pass  # 更新某本书籍def delete(self,request,id)：pass  # 删除某本书籍
restframework(Django)  ----针对数据：json(1)Django的原生request:浏览器   -------------  服务器"GET url?a=1&b=2 http/1.1\r\user_agent:Google\r\ncontentType:urlencoded\r\n\r\n""POST url http/1.1\r\user_agent:Google\r\ncontentType:urlencoded\r\n\r\na=1&b=2"request.body: a=1&b=2request.POST:if contentType:urlencoded:a=1&b=2----->{"a":1,"b":2}(2)restframework 下的APIView：(3)class PublishSerializers(serializers.Serializer):name=serializers.CharField()email=serializers.CharField()PublishSerializers(queryset,many=true)PublishSerializers(model_obj)总结：1 reuqest类----源码2 restframework 下的APIView--源码url(r'^books/$', views.BookView.as_view(),name="books")#  View下的view
books/一旦被访问： view(request) ------APIView: dispatch()3 def dispatch():构建request对象self.request=Request(request)self.request._requestself.request.GET  # getself.request.data # POST  PUT
          分发----if get请求：if request.method.lower() in self.http_method_names:handler = getattr(self, request.method.lower(),self.http_method_not_allowed)else:handler = self.http_method_not_allowed   response = handler(request, *args, **kwargs) # self.get(request, *args, **kwargs)return response                4 序列化类# from django.core import serializers# ret=serializers.serialize("json",publish_list)
        restframework下的序列类  BookModelSerializers将queryset或者model对象序列成一json数据bs=BookModelSerializers(book_list,many=True,context={'request': request})bs=BookModelSerializers(book,context={'request': request})还可以做校验数据，json-------》queryset/model-->记录bs=BookModelSerializers(data=request.data)if bs.is_valid():print(bs.validated_data)bs.save() # 重写create方法5 操作数据：以Book表为例class BookView(APIView):# 查看所有书籍def get(self,request):book_list=Book.objects.all()bs=BookModelSerializers(book_list,many=True,context={'request': request})return Response(bs.data)# 添加一本书籍    def post(self,request):# post请求的数据bs=BookModelSerializers(data=request.data)if bs.is_valid():print(bs.validated_data)bs.save()# create方法return Response(bs.data)else:return Response(bs.errors)class BookDetailView(APIView):# 查看一本书籍def get(self,request,id):book=Book.objects.filter(pk=id).first()bs=BookModelSerializers(book,context={'request': request})return Response(bs.data)# 更新一本书籍def put(self,request,id):book=Book.objects.filter(pk=id).first()bs=BookModelSerializers(book,data=request.data)if bs.is_valid():bs.save()return Response(bs.data)else:return Response(bs.errors)# 删除某一本书籍def delete(self,request,id):Book.objects.filter(pk=id).delete()return Response()restframework1 APIView2 序列组件3 视图、4 组件（认证权限频率）5 数据解析器6 分页和Response

转载于:https://www.cnblogs.com/venicid/p/11231983.html

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