day 96

CBV与FBV

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
/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=2
request.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._request
self.request.GET # get
self.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()

restframework

1 APIView
2 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