rest_framework_django 学习笔记二(视图路由)

rest_framwork_django学习笔记一(序列化器)

一、rest framework 中Request 与 Response

1、Request

REST framework 传入视图的request对象不再是Django默认的HttpRequest对象,二是REST Famework 提供的扩展了 Http Request 类的Request 类的对象。

REST framework 提供了 Parser 解析器,在接受到请求后悔自藕丁工具Content-Type 指明的请求数据类型(如JSON、表单等)将请求数据就行parse 解析,解析为类字典对象保存到Request对象中。

Request对象的数据时自动工具前端发送的哪种格式的数据,我们都可以以统一的方式读取数据。

常用属性

1).data

request.data 返回解析之后的请求数据 类似于django中标准的 request.POST 和request.FILES属性,但提供如下特性:

  • 包含了解析之后的文件和非文件数据;
  • 包含了对POST,PUT,PATCH请求方式解析后的数据;
  • 利用REST ftamework 的parsers 解析器,不仅支持表单类型数据,也支持JSON数据;
2).query_params

request.query_params 与 django标准的 request.GET 相同,只是更换了更准确的名称而已。

2、Response

rest_framework.response.Response

REST framework 提供了一个响应类 Response,使用该类构造响应对象时,响应的具体数据内容会被转换(render渲染)成符合前端需求的类型。

REST framework 提供了 Renderer 渲染器,用来工具请求头中的 Accept (接收数据类型声明)来自自动转换响应数据到对应格式。如果前端请求中为进行 Accept 声明,则会采用默认方式处理响应数据,我们可以通过配置来修改默认响应格式。

# settings.py# ================================================= ## ***************** REST_FRAMEWORK **************** ## ================================================= #REST_FRAMEWORK = {"DATETIME_FORMAT": "%Y-%m-%d %H:%M:%S",# 日期时间格式配置"DATE_FORMAT": "%Y-%m-%d",'DEFAULT_PERMISSION_CLASSES': ['rest_framework.renderers.JONSRenderer',#json 渲染器'rest_framework.renderers,BrowsableAPIRenderer',# 浏览API渲染器],}

构造方式

Response(data,status=None,template_name=None,headers=None,content_type=None)

data 数据不要是 render 处理之后的数据,只是传递 python 的内建类型数据即可,REST framework 会使用 renderer 渲染器处理 data .

data不能是复杂结构的数据,如 Django的模型对象,对于这样的数据我们可以使用 Serializer 序列化器序列化处理后(转为了python字典类型)再传递给 data 参数。

参数说明:

  • data:为响应准备的序列化处理后的数据;
  • status:状态吗,默认200;
  • template_name:末班名称,如果使用HTMLRenderer 时需要指明;
  • headers:用于存放响应头信息的字典;
  • content_type:响应数据的Content_type,通常此参数无需传递,REST framework 会工具前端所需类型数据来设置该参数。

常用属性

1).data

传给 response 对象的序列化后,但尚未 render 处理的数据

2).status_code

状态码的数字

3).content

结果 render 处理后的响应数据

状态码

为了方便设置状态码 REST framework 在 rest_framework.status 模块中提供了常用状态码常量。

rest_framework.status
1)信息告知 – 1xx
HTTP_100_CONTINUE = 100HTTP_101_SWITCHING_PROTOCOLS = 101HTTP_102_PROCESSING = 102HTTP_103_EARLY_HINTS = 103
2) 成功 – 2xx
HTTP_200_OK = 200HTTP_201_CREATED = 201HTTP_202_ACCEPTED = 202HTTP_203_NON_AUTHORITATIVE_INFORMATION = 203HTTP_204_NO_CONTENT = 204HTTP_205_RESET_CONTENT = 205HTTP_206_PARTIAL_CONTENT = 206HTTP_207_MULTI_STATUS = 207HTTP_208_ALREADY_REPORTED = 208HTTP_226_IM_USED = 226
3)重定向 – 3xx
HTTP_300_MULTIPLE_CHOICES = 300HTTP_301_MOVED_PERMANENTLY = 301HTTP_302_FOUND = 302HTTP_303_SEE_OTHER = 303HTTP_304_NOT_MODIFIED = 304HTTP_305_USE_PROXY = 305HTTP_306_RESERVED = 306HTTP_307_TEMPORARY_REDIRECT = 307HTTP_308_PERMANENT_REDIRECT = 308
4)客户端错误 – 4xx
HTTP_400_BAD_REQUEST = 400HTTP_401_UNAUTHORIZED = 401HTTP_402_PAYMENT_REQUIRED = 402HTTP_403_FORBIDDEN = 403HTTP_404_NOT_FOUND = 404HTTP_405_METHOD_NOT_ALLOWED = 405HTTP_406_NOT_ACCEPTABLE = 406HTTP_407_PROXY_AUTHENTICATION_REQUIRED = 407HTTP_408_REQUEST_TIMEOUT = 408HTTP_409_CONFLICT = 409HTTP_410_GONE = 410HTTP_411_LENGTH_REQUIRED = 411HTTP_412_PRECONDITION_FAILED = 412HTTP_413_REQUEST_ENTITY_TOO_LARGE = 413HTTP_414_REQUEST_URI_TOO_LONG = 414HTTP_415_UNSUPPORTED_MEDIA_TYPE = 415HTTP_416_REQUESTED_RANGE_NOT_SATISFIABLE = 416HTTP_417_EXPECTATION_FAILED = 417HTTP_418_IM_A_TEAPOT = 418HTTP_421_MISDIRECTED_REQUEST = 421HTTP_422_UNPROCESSABLE_ENTITY = 422HTTP_423_LOCKED = 423HTTP_424_FAILED_DEPENDENCY = 424HTTP_425_TOO_EARLY = 425HTTP_426_UPGRADE_REQUIRED = 426HTTP_428_PRECONDITION_REQUIRED = 428HTTP_429_TOO_MANY_REQUESTS = 429HTTP_431_REQUEST_HEADER_FIELDS_TOO_LARGE = 431HTTP_451_UNAVAILABLE_FOR_LEGAL_REASONS = 451
5)服务端错误 – 5xx
HTTP_500_INTERNAL_SERVER_ERROR = 500HTTP_501_NOT_IMPLEMENTED = 501HTTP_502_BAD_GATEWAY = 502HTTP_503_SERVICE_UNAVAILABLE = 503HTTP_504_GATEWAY_TIMEOUT = 504HTTP_505_HTTP_VERSION_NOT_SUPPORTED = 505HTTP_506_VARIANT_ALSO_NEGOTIATES = 506HTTP_507_INSUFFICIENT_STORAGE = 507HTTP_508_LOOP_DETECTED = 508HTTP_509_BANDWIDTH_LIMIT_EXCEEDED = 509HTTP_510_NOT_EXTENDED = 510HTTP_511_NETWORK_AUTHENTICATION_REQUIRED = 511

自定义返回

# -*- coding: utf-8 -*-from rest_framework.response import Responseclass SuccessResponse(Response):"""标准响应成功的返回, SuccessResponse(data)或者SuccessResponse(data=data)(1)默认code返回2000, 不支持指定其他返回码"""def __init__(self, data=None, msg='success', status=None, template_name=None, headers=None, exception=False, content_type=None,page=1,limit=1,total=1):std_data = {"code": 2000,"data": {"page": page,"limit": limit,"total": total,"data": data},"msg": msg}super().__init__(std_data, status, template_name, headers, exception, content_type)class DetailResponse(Response):"""不包含分页信息的接口返回,主要用于单条数据查询(1)默认code返回2000, 不支持指定其他返回码"""def __init__(self, data=None,msg='success',status=None,template_name=None,headers=None,exception=False, content_type=None,):std_data = {"code": 2000,"data": data,"msg": msg}super().__init__(std_data, status, template_name, headers, exception, content_type)class ErrorResponse(Response):"""标准响应错误的返回,ErrorResponse(msg='xxx')(1)默认错误码返回400, 也可以指定其他返回码:ErrorResponse(code=xxx)"""def __init__(self, data=None, msg='error', code=400, status=None, template_name=None, headers=None, exception=False, content_type=None):std_data = {"code": code,"data": data,"msg": msg}super().__init__(std_data, status, template_name, headers, exception, content_type)

二、视图

1、两个基类

1.1 APIView

rest_framework.views.APIView

APIView 是 REST framework 提供的所有视图的基类,继承自django的 view 父类

APIView 与 view 的不同之处在于:

  • 传入到视图方法中的是REST framework 的 request 对象,而不是 django 的 HttpRequest 对象;
  • 视图方法可以返回 REST framework 的 Response 对象,视图会响应数据设置(render)符合前端要求的格式;
  • 任何 APIException 异常都会被捕获到,并且处理成合适的响应学习;
  • 在进行 dispatch() 分发前,会对请求进行身份认证、权限检查、流量控制

支持定义的属性:

  • authentication_classes 列表或原则,身份认证类;
  • permissoin_classes 列表或元祖,权限检查类;
  • throttle_classes 列表或元祖,流量控制类;

在 APIView 中仍以常规的类视图定义方法来实现 get()\post() 或者其他请求方式的方法。

''' 序列化器 '''from rest_framework import serializersfrom .models import Book, Publish, Author,AuthorDetailclass PublishSerializer(serializers.ModelSerializer):class Meta:model = Publishfields = '__all__'
''' urls.py '''urlpatterns = [path('publish/',PublishListAPIView.as_view()),# 列表视图path('publish//',PublishDetaAPIView.as_view()),# 详情视图]
1)查询列表
from rest_framework.views import APIViewfrom rest_framework.response import Responsefrom .models import *from .serializers import *class PublishListAPIView(APIView):''' 列表视图 '''def get(self,request):''' 查询所有 '''publish_list = Publish.objects.filter()serializer = PublishSerializer(instance=publish_list, many=True)return Response(serializer.data)

2)增
from rest_framework.views import APIViewfrom rest_framework.response import Responsefrom .models import *from .serializers import *class PublishListAPIView(APIView):''' 列表视图 '''def get(self,request):''' 查询所有 '''publish_list = Publish.objects.filter()serializer = PublishSerializer(instance=publish_list, many=True)response = Response(data=serializer.data)return response# return Response(serializer.data)def post(self,request):''' 新增 '''# 1、获取前端传入的数据data = request.data# 2、创建序列化器进行反序列化serializer = PublishSerializer(data=data)# 3、调用序列化器 is_valid 方法进行校验serializer.is_valid(raise_exception=True)# 4、调用序列化器的save() 方法进行执行 create 方法serializer.save()# 5、响应return Response(serializer.data)

3)删
from rest_framework.views import APIViewfrom rest_framework.response import Responsefrom .models import *from .serializers import *from rest_framework import statusclass PublishDetaAPIView(APIView):''' 详情列表 '''def delete(self,request,id):try:publish = Publish.objects.filter(pk=id).first()except Publish.DoesNotExist:return Response(status=status.HTTP_404_NOT_FOUND)publish.delete()return Response(status=status.HTTP_200_OK)

4)改
from rest_framework.views import APIViewfrom rest_framework.response import Responsefrom .models import *from .serializers import *from rest_framework import statusclass PublishDetaAPIView(APIView):''' 详情列表 '''def put(self,request,id):''' 修改 '''# 1、查询修改内容publish_obj = Publish.objects.filter(pk=id).first()if not publish_obj:return Response(status=status.HTTP_404_NOT_FOUND)# 2、获取前端出入的请求体数据data = request.data# 3、创建序列化器进行反序列化serializer = PublishSerializer(instance=publish_obj,data=data)# 4、校验serializer.is_valid(raise_exception=True)serializer.save()# 5、保存return Response(serializer.data)

增删查改代码全

''' urls.py'''urlpatterns = [path('publish/',PublishListAPIView.as_view()),# 列表视图增加、查询数据列表path('publish//',PublishDetaAPIView.as_view()),# 详情视图删除、单一查询、修改]
from rest_framework import serializersfrom .models import Book, Publish, Author,AuthorDetailclass PublishSerializer(serializers.ModelSerializer):''' 序列化器 '''class Meta:model = Publishfields = '__all__'
from django.db import models''' models.py '''class Publish(models.Model):name = models.CharField(max_length=32)city = models.CharField(max_length=64)email = models.EmailField()class Meta:verbose_name = '出版社表'
# coding=utf-8'''@date:2023/11/20 13:37@mail:xiaochun235@qq.com@Content:APIView 序列化器'''from rest_framework.views import APIViewfrom rest_framework.response import Responsefrom .models import *from .serializers import *from rest_framework import statusclass PublishListAPIView(APIView):''' 列表视图 '''def get(self,request):''' 查询所有 '''publish_list = Publish.objects.filter()serializer = PublishSerializer(instance=publish_list, many=True)response = Response(data=serializer.data)return response# return Response(serializer.data)def post(self,request):''' 新增 '''# 1、获取前端传入的数据data = request.data# 2、创建序列化器进行反序列化serializer = PublishSerializer(data=data)# 3、调用序列化器 is_valid 方法进行校验serializer.is_valid(raise_exception=True)# 4、调用序列化器的save() 方法进行执行 create 方法serializer.save()# 5、响应return Response(serializer.data)class PublishDetaAPIView(APIView):''' 详情列表 '''def get(self,request,id):''' 查询 pk'''# 查询pkpublish_obj = Publish.objects.filter(pk = id).first();if not publish_obj:return Response(status=status.HTTP_404_NOT_FOUND)# 将查询内容序列化serializer = PublishSerializer(instance = publish_obj)# 响应response = Response(data=serializer.data)return responsedef put(self,request,id):''' 修改 '''# 1、查询修改内容publish_obj = Publish.objects.filter(pk=id).first()if not publish_obj:return Response(status=status.HTTP_404_NOT_FOUND)# 2、获取前端出入的请求体数据data = request.data# 3、创建序列化器进行反序列化serializer = PublishSerializer(instance=publish_obj,data=data)# 4、校验serializer.is_valid(raise_exception=True)serializer.save()# 5、保存return Response(serializer.data)def delete(self,request,id):''' 删除 '''try:publish = Publish.objects.filter(pk=id).first()except Publish.DoesNotExist:return Response(status=status.HTTP_404_NOT_FOUND)publish.delete()return Response(status=status.HTTP_200_OK)

1.2 GenericAPIView

rest_framework.generics.GenericAPIView

继承自 APIVIew,主要增加了操作序列化器和数据查询的方法,作用是为了Mixin扩展类的执行提供方法支持,通常在使用时,可搭配一个或多个 Mixin扩展类

提供的相关序列化器使用的属性与方法

属性:
  • serializer_class 指明视图使用的序列化器
方法:
  • get_serializer_class(self)

返回序列化器类,默认范湖 serializer_class,可以 重写。例如:

def get_serializer_class(self):if self.request.user.is_staff:return FullAccounSerializerreturn BasicAccountSerializer
  • get_serializer(self,args,*Kwargs)

返回序列化器对象,主要用来提供给Mixin扩展类使用,如果我们在视图中想要获取序列化器对象也可以直接调用此方法。

注意,该方法在提供序列化器对象的时候,会向序列化器对象的 context属性补充三个数据:request、format、view,这三个数据对象可以在定义序列化器时使用。

  • request 当前视图的请求对象
  • view 当前请求的类视图对象
  • format 当前请求期望返回的数据格式
提供的关于数据库查询的属性与方法
属性:
  • queryser 指明使用的数据查询集
方法:
  • get_queryset(self)

返回视图使用的查询集,主要用来提供给Mixin 扩展使用,是列表视图与相求视图获取数据的基础,默认返回 queryset 属性,可以重写,例如:

defget_queryset(self):user = self.request.userreturnuser.accounts.all()
  • get_object(self)

返回详情视图所需的模型类数据对象,主要用来提供给Mixin扩展类使用。

在视图中可以调用该方法获取详情学习的模型类对象。

若详情访问的模型类对象不存在,会返回404.

该方法默认使用 APIView 提供的check_object_permissions 方法检查当前对象是否有权限被访问。

from rest_framework.generics import GenericAPIViewfrom rest_framework.response import Responsefrom .models import *from .serializers import *class PublishListGenericAPIView(GenericAPIView):# 指定序列化器的 类serializer_class = PublishSerializer# 指定查询集 ’数据来源‘queryset = Publish.objects.all()def get(self,reqest):publish = self.get_queryset() # 获取所有数据serializer = self.get_serializer(publish,many=True)# 构造序列化器对象return Response(data=serializer.data)class PublishDetaGenericAPIView(GenericAPIView):''' 详情视图 '''# 指定序列化器的 类serializer_class = PublishSerializer# 指定查询集 ’数据来源‘queryset = Publish.objects.all()def get(self,request,pk):''' 查询 单一'''publish = self.get_object()# 查询单一serializer = self.get_serializer(publish)return Response(data=serializer.data)

urls.py

from .generic_apiview_views import *from django.urls import pathurlpatterns = [# GenericAPIViewpath('publish/',PublishListGenericAPIView.as_view()),# 列表视图# GenericAPIViewpath('publish//',PublishDetaGenericAPIView.as_view()),# 详情视图]

其他扩展
  • pagination_class 指明分页控制类
  • filter_backends 指明过滤控制后端
  • ordering_fields 指明过滤中的排序后端
  • authentication_classes 指明认证后端
  • permission_classes 指明权限后端
1)查询、修改、单个查询
from .generic_apiview_views import *from django.urls import pathurlpatterns = [# GenericAPIViewpath('publish/',PublishListGenericAPIView.as_view()),# 列表视图# GenericAPIViewpath('publish//',PublishDetaGenericAPIView.as_view()),# 详情视图]
from rest_framework.generics import GenericAPIViewfrom rest_framework.response import Responsefrom .models import *from .serializers import *class PublishListGenericAPIView(GenericAPIView):# 指定序列化器的 类serializer_class = PublishSerializer# 指定查询集 ’数据来源‘queryset = Publish.objects.all()def get(self,reqest):''''''publish = self.get_queryset() # 获取所有数据serializer = self.get_serializer(publish,many=True)# 构造序列化器对象return Response(data=serializer.data)class PublishDetaGenericAPIView(GenericAPIView):''' 详情视图 '''# 指定序列化器的 类serializer_class = PublishSerializer# 指定查询集 ’数据来源‘queryset = Publish.objects.all()def get(self,request,pk):''' 查询 单一'''publish = self.get_object()# 查询单一serializer = self.get_serializer(publish)return Response(data=serializer.data)def put(self,request,pk):publish = self.get_object()serializer = self.get_serializer(publish,request.data)serializer.is_valid(raise_exception = True)serializer.save()return Response(serializer.data)
2) 整合 Mixin 实现简单增删查改操作
from rest_framework.generics import GenericAPIViewfrom rest_framework.response import Responsefrom rest_framework.mixins import ListModelMixin,CreateModelMixin,DestroyModelMixin,RetrieveModelMixin,UpdateModelMixinfrom .serializers import *class PublishListGenericAPIView(ListModelMixin,CreateModelMixin,GenericAPIView): # 指定序列化器的 类 serializer_class = PublishSerializer # 指定查询集 ’数据来源‘ queryset = Publish.objects.all() def get(self,request):''' 查询 '''return self.list(request=request) def post(self,request):''' 新增 '''return self.create(request)class PublishDetaGenericAPIView(RetrieveModelMixin,DestroyModelMixin,UpdateModelMixin,GenericAPIView):''' 详情视图 '''# 指定序列化器的 类serializer_class = PublishSerializer# 指定查询集 ’数据来源‘queryset = Publish.objects.all()def get(self,request,pk):''' 查询 单一'''return self.retrieve(request,pk)def put(self,request,pk):''' 修改 '''return self.update(request,pk)def delete(self,request,pk):''' 删除 '''return self.destroy(request,pk)

3) 简化后的 GenericApiView增删查改
from .generic_apiview_views import *from django.urls import pathurlpatterns = [# GenericAPIViewpath('publish/',PublishListGenericAPIView.as_view()),# 列表视图# GenericAPIViewpath('publish//',PublishDetaGenericAPIView.as_view()),# 详情视图]
rest_framework.generics.ListAPIView # 列表查询rest_framework.generics.CreateAPIView # 新增rest_framework.generics.UpdateAPIView# 修改rest_framework.generics.DestroyAPIView#删除 rest_framework.generics.RetrieveAPIView # 查询一条数据rest_framework.generics.ListCreateAPIView# 列表查询 + 新增rest_framework.generics.RetrieveUpdateDestroyAPIView # 单个查询,修改,删除
from rest_framework.generics import GenericAPIView,\ListAPIView,\CreateAPIView,\UpdateAPIView,\DestroyAPIView,\RetrieveAPIView,\ListCreateAPIView,\RetrieveUpdateDestroyAPIViewfrom .serializers import *class PublishListGenericAPIView(ListCreateAPIView,GenericAPIView):# 指定序列化器的 类serializer_class = PublishSerializer# 指定查询集 ’数据来源‘queryset = Publish.objects.all()class PublishDetaGenericAPIView(RetrieveUpdateDestroyAPIView,GenericAPIView):''' 详情视图 '''# 指定序列化器的 类serializer_class = PublishSerializer# 指定查询集 ’数据来源‘queryset = Publish.objects.all()

2、视图集ViewSet

2.1 ViewSet

使用视图集 ViewSet,可以将一系列逻辑相关的动作放到一个类中:

  • list() 提供一组数据
  • retrieve() 提供单个数据
  • create() 创建数据
  • update() 保存数据
  • destory() 删除数据

ViewSet 视图集类不再实现 get()、post() 等方法,而是实现动作 action 如list()、create() 等。

视图集只在使用 as_view() 方法的时候,才会到 action 动作与具体请求方式对应上,如:

from rest_framework.viewsets import ViewSetfrom rest_framework.response import Responsefrom .serializers import PublishSerializerfrom .models import *class PublishViewset(ViewSet):def list(self,request):objects_filter = Publish.objects.filter()serializer = PublishSerializer(instance=objects_filter,many=True)return Response(data=serializer.data)def add(self,request):''' 方法未实现 '''passdef delete(self,request,pk): ''' 方法未实现 '''passdef get_by(self,request,pk):objects_filter = Publish.objects.filter(pk=pk).first()serializer = PublishSerializer(instance=objects_filter)return Response(data=serializer.data)def update(self,request,pk): ''' 方法未实现 '''pass

在设置路由时,我们可以如下操作:

from .view_set_views import *from django.urls import pathurlpatterns = [# GenericAPIViewpath('publish/',PublishViewset.as_view({'get':'list','post':'add'})),# 列表视图# GenericAPIViewpath('publish//',PublishViewset.as_view({'get':'get_by','delete':'delete','put':'update'})),# 详情视图]

继承自 APIView 与ViewSetMixin ,作用也与APIView 基本类似,提供了身份认证、权限校验、流量管理等。

ViewSet 主要通过继承ViewSetMixin 来实现在调用 as_view() 时传入字典(如{‘get’:‘list’})的映射处理工作。

在ViewSet中,没有提供如何动作 action 方法,需要我们自己实现 action 方法

2.2 GenericViewset

使用ViewSet 通常并不方便,因为list、retrieve、create、update、destory 等方法都需要自己编写、而这些方法与前面讲的 Mixin 扩展类提供的方法同名,所以我们可以通过继承 Mixin 扩展类来服用这些方法而无需自己编写,但是Mixin扩展类依赖于 GenericAPIView ,所以还需要继承 GenericAPIView.

GenericViewSet 就帮助我们完成了这样的继承工作,继承自 GenericAPIView 与 ViewSetMixin,在实现了调用as_view() 时传入字典(如{‘get’:‘list’})的映射处理工作同时,还提供了 GenericAPIView 提供的基础方法,可以直接搭配Minxin 扩展类使用。

举例:

urls.py

from .view_set_views import *from django.urls import pathurlpatterns = [# GenericViewSet 整合 mixinspath('publish/',PublishViewset.as_view({'get':'list','post':'create'})),# 列表视图# GenericViewSet 整合 mixinspath('publish//',PublishViewset.as_view({'get':'retrieve','delete':'destroy','put':'update'})),# 详情视图]
''' 原始 GenericViewSet配合 mixin'''from rest_framework.viewsets import ViewSet,GenericViewSet,ReadOnlyModelViewSetfrom rest_framework.mixins import ListModelMixin,RetrieveModelMixin,CreateModelMixin,UpdateModelMixin,DestroyModelMixinfrom .serializers import PublishSerializerfrom .models import *class PublishViewset(GenericViewSet,ListModelMixin,RetrieveModelMixin,CreateModelMixin,DestroyModelMixin,UpdateModelMixin):''' 视图集 '''queryset = Publish.objects.all()serializer_class = PublishSerializer

2.3ReadOnlyModelViewSet

rest_framework.viewsets.ReadOnlyModelViewSet
from rest_framework.viewsets import GenericViewSet,ReadOnlyModelViewSet,ModelViewSetfrom .serializers import PublishSerializerfrom .models import *class PublishViewset(ReadOnlyModelViewSet,ModelViewSet):''' 视图集 '''queryset = Publish.objects.all()serializer_class = PublishSerializer

2.4ModelViewSet

rest_framework.viewsets.ModelViewSet

3、视图集中定义附加 action 动作

3.1 增加自定义方法

from .view_set_views import *from django.urls import pathfrom .book_views import BookModelViewSeturlpatterns = [path('book/', BookModelViewSet.as_view({'get': 'list', 'post': 'create'})),# 列表视图path('book//', BookModelViewSet.as_view({'get': 'retrieve', 'delete': 'destroy', 'put': 'update'})),# 详情视图path('book/get_book', BookModelViewSet.as_view({'get': 'get_book'})),# 通过获取大于 多少钱的书path('book//update_book_price', BookModelViewSet.as_view({'put': 'update_book_price'})),# 修改书的价格]
from django.db.models import Qfrom rest_framework.viewsets import ModelViewSetfrom .serializers import BookSerializerfrom .models import Bookfrom rest_framework.response import Responseclass BookModelViewSet(ModelViewSet):queryset = Book.objects.all()serializer_class = BookSerializerdef get_book(self,request):''' 查询 price 大于data['price']的书 '''data = request.databook_qy = Q(price__gt=data['price'])book_list = Book.objects.filter(book_qy)# 工具id获取最后一本书serializer = self.get_serializer(book_list,many=True)return Response(serializer.data)def update_book_price(self,request,pk):''' 修改某一本书的价格 '''book_object = self.get_object()book_object.price = request.data['price']book_object.save()serializer = self.get_serializer(book_object)return Response(serializer.data)

4、总结

4.1APIView

在APIView中的request直接叫 request;

django中的响应对象叫HttpResponse,而APIView中的叫Response;

APIView中新增了异常捕获;

在APIView中可以用序列化器;

''' urls.py '''urlpatterns = [path('publish/',PublishListAPIView.as_view()),# 列表视图path('publish//',PublishDetaAPIView.as_view()),# 详情视图]
from rest_framework.views import APIViewfrom rest_framework.response import Responsefrom .models import *from .serializers import *from rest_framework import statusclass PublishListAPIView(APIView):''' 列表视图 '''def get(self,request):''' 查询所有 '''publish_list = Publish.objects.filter()serializer = PublishSerializer(instance=publish_list, many=True)response = Response(data=serializer.data)return response# return Response(serializer.data)def post(self,request):''' 新增 '''# 1、获取前端传入的数据data = request.data# 2、创建序列化器进行反序列化serializer = PublishSerializer(data=data)# 3、调用序列化器 is_valid 方法进行校验serializer.is_valid(raise_exception=True)# 4、调用序列化器的save() 方法进行执行 create 方法serializer.save()# 5、响应return Response(serializer.data)class PublishDetaAPIView(APIView):''' 详情列表 '''def get(self,request,id):''' 查询 pk'''# 查询pkpublish_obj = Publish.objects.filter(pk = id).first();if not publish_obj:return Response(status=status.HTTP_404_NOT_FOUND)# 将查询内容序列化serializer = PublishSerializer(instance = publish_obj)# 响应response = Response(data=serializer.data)return responsedef put(self,request,id):''' 修改 '''# 1、查询修改内容publish_obj = Publish.objects.filter(pk=id).first()if not publish_obj:return Response(status=status.HTTP_404_NOT_FOUND)# 2、获取前端出入的请求体数据data = request.data# 3、创建序列化器进行反序列化serializer = PublishSerializer(instance=publish_obj,data=data)# 4、校验serializer.is_valid(raise_exception=True)serializer.save()# 5、保存return Response(serializer.data)def delete(self,request,id):''' 删除 '''try:publish = Publish.objects.filter(pk=id).first()except Publish.DoesNotExist:return Response(status=status.HTTP_404_NOT_FOUND)publish.delete()return Response(status=status.HTTP_200_OK)

4.2GenericAPIView

GenericAPIView 继承的就是 APIView;

GenericAPIView 增加了分页和过滤功能;

''' urls.py '''urlpatterns = [path('publish/',PublishListAPIView.as_view()),# 列表视图path('publish//',PublishDetaAPIView.as_view()),# 详情视图]
from rest_framework.generics import GenericAPIViewfrom rest_framework.response import Responsefrom .models import *from .serializers import *class PublishListGenericAPIView(GenericAPIView):# 指定序列化器的 类serializer_class = PublishSerializer# 指定查询集 ’数据来源‘queryset = Publish.objects.all()def get(self,reqest):publish = self.get_queryset() # 获取所有数据serializer = self.get_serializer(publish,many=True)# 构造序列化器对象return Response(data=serializer.data)class PublishDetaGenericAPIView(GenericAPIView):''' 详情视图 '''# 指定序列化器的 类serializer_class = PublishSerializer# 指定查询集 ’数据来源‘queryset = Publish.objects.all()def get(self,request,pk):''' 查询 单一'''publish = self.get_object()# 查询单一serializer = self.get_serializer(publish)return Response(data=serializer.data)
1) GenericAPIView + Minxin
''' urls.py '''urlpatterns = [path('publish/',PublishListAPIView.as_view()),# 列表视图path('publish//',PublishDetaAPIView.as_view()),# 详情视图]
from rest_framework.generics import GenericAPIViewfrom rest_framework.response import Responsefrom rest_framework.mixins import ListModelMixin,CreateModelMixin,DestroyModelMixin,RetrieveModelMixin,UpdateModelMixinfrom .serializers import *class PublishListGenericAPIView(ListModelMixin,CreateModelMixin,GenericAPIView): # 指定序列化器的 类 serializer_class = PublishSerializer # 指定查询集 ’数据来源‘ queryset = Publish.objects.all() def get(self,request):''' 查询 '''return self.list(request=request) def post(self,request):''' 新增 '''return self.create(request)class PublishDetaGenericAPIView(RetrieveModelMixin,DestroyModelMixin,UpdateModelMixin,GenericAPIView):''' 详情视图 '''# 指定序列化器的 类serializer_class = PublishSerializer# 指定查询集 ’数据来源‘queryset = Publish.objects.all()def get(self,request,pk):''' 查询 单一'''return self.retrieve(request,pk)def put(self,request,pk):''' 修改 '''return self.update(request,pk)def delete(self,request,pk):''' 删除 '''return self.destroy(request,pk)

4.3 ViewSet

from .views import *from django.urls import pathurlpatterns = [# 可以使用 路由器# ViewSetpath('publish/',PublishViewset.as_view({'get':'list','post':'add'})),# 列表视图# ViewSetpath('publish//',PublishViewset.as_view({'get':'get_by','delete':'delete','put':'update'})),# 详情视图]
from rest_framework.viewsets import ViewSetfrom rest_framework.response import Responsefrom .serializers import PublishSerializerfrom .models import *class PublishViewset(ViewSet):def list(self,request):objects_filter = Publish.objects.filter()serializer = PublishSerializer(instance=objects_filter,many=True)return Response(data=serializer.data)def add(self,request):# 注意序列化器中 的第一个参数是 instance 第二个是 data,当没写时,默认从第一个开始serializer = self.get_serializer(data=request.data)serializer.is_valid(raise_exception=True)serializer.save()return Response(data=serializer.data)def delete(self,request,pk):''' 删除 '''publish = self.get_object()# 查询单一publish.delete()return Response()def get_by(self,request,pk):objects_filter = Publish.objects.filter(pk=pk).first()serializer = PublishSerializer(instance=objects_filter)return Response(data=serializer.data)def update(self,request,pk):get_object = self.get_object()serializer = self.get_serializer(get_object, request.data)serializer.is_valid(raise_exception=True)serializer.save()return Response(data=serializer.data)

4.4GenericViewSet

from .views import *from django.urls import pathurlpatterns = [# 可以使用 路由器# ViewSetpath('publish/',PublishViewset.as_view({'get':'list','post':'create'})),# 列表视图# ViewSetpath('publish//',PublishViewset.as_view({'get':'retrieve','delete':'destroy','put':'update'})),# 详情视图]
from rest_framework.viewsets import GenericViewSetfrom rest_framework.response import Responsefrom .serializers import PublishSerializerfrom .models import *class PublishViewset(GenericViewSet):queryset = Publish.objects.filter()serializer_class = PublishSerializerdef list(self,request):data_lis = self.get_queryset()serializer = self.get_serializer(data_lis, many=True)return Response(data=serializer.data)def retrieve(self,request,pk):''' 查询 单一'''publish = self.get_object()# 查询单一serializer = self.get_serializer(publish)return Response(data=serializer.data)def destroy(self,request,pk):''' 删除 '''publish = self.get_object()# 查询单一publish.delete()return Response()def update(self,request,pk):''' 修改 '''get_object = self.get_object()serializer = self.get_serializer(get_object, request.data)serializer.is_valid(raise_exception=True)serializer.save()return Response(data=serializer.data)def create(self,request):''' 新增 '''# 注意序列化器中 的第一个参数是 instance 第二个是 data,当没写时,默认从第一个开始serializer = self.get_serializer(data=request.data)serializer.is_valid(raise_exception=True)serializer.save()return Response(data=serializer.data)
1) GenericViewSet + Minxin
from .view_set_views import *from django.urls import pathurlpatterns = [# 可以使用 路由器# GenericAPIViewpath('publish/',PublishViewset.as_view({'get':'list','post':'create'})),# 列表视图# GenericAPIViewpath('publish//',PublishViewset.as_view({'get':'retrieve','delete':'destroy','put':'update'})),# 详情视图]
from rest_framework.viewsets import GenericViewSetfrom rest_framework.mixins import ListModelMixin,\RetrieveModelMixin,\CreateModelMixin,\UpdateModelMixin,\DestroyModelMixinfrom rest_framework.response import Responsefrom .serializers import PublishSerializerfrom .models import *class PublishViewset(GenericViewSet,ListModelMixin,RetrieveModelMixin,CreateModelMixin,UpdateModelMixin,DestroyModelMixin):# 由于 mixins 中 已经将重用的方法写了,不用在写 也可以自行重写。queryset = Publish.objects.filter()serializer_class = PublishSerializer

4.5 ModelViewSet

from rest_framework.viewsets import ModelViewSetfrom .serializers import PublishSerializerfrom .models import *class PublishViewset(ModelViewSet):''' ModelViewSet 已经继承了mixins中常用的内容 '''queryset = Publish.objects.filter()serializer_class = PublishSerializer

三、路由器

路由器只能配合视图一起使用

视图集:ViewSet、GenericViewSet 、ModelViewSet

rest_framework.routers.DefaultRouter

路由器只会生成默认的五个路由

其余的还需要自己手动加入

路由器使用方法:

from rest_framework.routers import DefaultRouterurlpatterns = [] # 其他手动加入的路由内容router = DefaultRouter()# 创建路由器router.register('book',BookModelViewSet,basename='book')# 注册路由urlpatterns += router.urls# 把生成好的路由拼接到urlpatterns中去

自定义增加的行为

@action(methods=[‘get’],detail=False)

action 中的参数

methods 表示的是 请求方式

detail 表示的是 路由生成方式;当detail=True 时会生成的url 则是 book/+ **PK/方法名/ ** 当 detail=False 时会生成 book/+ **方法名/ **

rest_framework.decorators.action
from django.db.models import Qfrom rest_framework.viewsets import ModelViewSetfrom rest_framework.decorators import actionfrom .serializers import BookSerializerfrom .models import Bookfrom rest_framework.response import Responseclass BookModelViewSet(ModelViewSet):queryset = Book.objects.all()serializer_class = BookSerializer# datail 为 False 表示路径名格式应该为:books/get_book/@action(methods=['get'],detail=False)def get_book(self,request):''' 查询 price 大于data['price']的书 '''data = request.databook_qy = Q(price__gt=data['price'])book_list = Book.objects.filter(book_qy)# 工具id获取最后一本书serializer = self.get_serializer(book_list,many=True)return Response(serializer.data)# datail 为 True 表示路径名格式应该为:books/pk/update_book_price/@action(methods=['put'], detail=True)def update_book_price(self,request,pk):''' 修改某一本书的价格 '''book_object = self.get_object()book_object.price = request.data['price']book_object.save()serializer = self.get_serializer(book_object)return Response(serializer.data)
''' urls.py '''from .book_views import BookModelViewSetfrom rest_framework.routers import DefaultRouterurlpatterns = []router = DefaultRouter()# 创建路由器router.register('book',BookModelViewSet,basename='book')# 注册路由urlpatterns += router.urls# 把生成好的路由拼接到urlpatterns中去

DefaultRouter

rest_framework.routers.DefaultRouter

SimpleRouter

rest_framework.routers.SimpleRouter

注意:

SinmpleRouter 和 DefaultRouter 只有一个区别,DefaultRouter 会多生成一个根路由

其他笔记

序列化器

视图路由

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