在简单分析mixins之前，我们先来简单看下如何使用？
url配置如下：
url(r"books/$",views.BookView.as_view()), url(r"bookdetail/(?P<pk>\d+)/$",views.BookViewDetail.as_view()),model类解析，用来校验请求参数的
class BookSerializers(serializers.ModelSerializer): class Meta: model=Book fields="__all__"视图类 BookView是对book表的所有记录查询、增加某些数据记录 BookViewDetail是对book表单条数据的查询、修改、删除
from rest_framework import mixins from rest_framework import generics class BookView(mixins.ListModelMixin, mixins.CreateModelMixin, generics.GenericAPIView): queryset = Book.objects.all() serializer_class = BookSerializers def get(self, request, *args, **kwargs): return self.list(request, *args, **kwargs) def post(self, request, *args, **kwargs): return self.create(request, *args, **kwargs) class BookViewDetail( mixins.RetrieveModelMixin, mixins.DestroyModelMixin, mixins.UpdateModelMixin, generics.GenericAPIView ): queryset = Book.objects.all() serializer_class = BookSerializers def get(self,request, *args, **kwargs): return self.retrieve(request, *args, **kwargs) def delete(self,request, *args, **kwargs): return self.destroy(request, *args, **kwargs) def put(self,request, *args, **kwargs): return self.update(request, *args, **kwargs)我这里就不去测试了，直接简单分析源码，如果看测试结果可以去APIView、mixins、generics、HyperlinkedIdentityField了解
BookView类多重继承了mixins.ListModelMixin、 mixins.CreateModelMixin、generics.GenericAPIView，用来进行验证request请求，从而对book表的数据集合的查看、添加数据操作
BookViewDetail类，多重继承了mixins.RetrieveModelMixin、mixins.DestroyModelMixin、mixins.UpdateModelMixin,、 generics.GenericAPIView 用来进行验证request请求，从而对book表进行单条数据查看、修改、删除操作
我们先看mixins模块，该模块有如下几个类
class CreateModelMixin(object):增加 class ListModelMixin(object):展示数据列表 class RetrieveModelMixin(object):展示单条数据 class UpdateModelMixin(object):更新单条数据 class DestroyModelMixin(object):删除单条数据在分析源码前，我们先来了解多重继承的一个知识点
class A: def a(self): print("A") self.b() class B: def b(self): print("B") class D(A,B): pass d = D() d.a()会输出AB 类D多重继承AB,类D实例对象d.a()时候，如果在类A中找不到b()方法，它就会在多重继承的AB类中，横向寻找b方法，结果在类B中找到，然后输出
我在APIView源码分析，分析了APIView的大概执行流程，我们先看下多重继承类中的generics.GenericAPIView，看看它跟APIView有何关联？点开源码，原来GenericAPIView类是APIView的子类，继而扩充了一些其他的方法，我举出如下几个方法
get_queryset:提供方法，用来获取request请求封装完毕的结果集 get_object：获取单条数据 get_serializer:获取序列化后的数据 get_serializer_class：获取需要序列化的model类 get_serializer_context：获取序列化的数据，定义了某种格式的字典 paginator：分页器在BookView中依然按着APIView的执行流程，通过请求方式，诸如get\post等，当request发起请求时，调用dispatch然后执行某个get\post，我们自己定义好的入口类方法，
我们就以http://127.0.0.1:8000/books/(get方法)来举例，会执行如下代码：
def get(self, request, *args, **kwargs): return self.list(request, *args, **kwargs)该方法直接返回了self.list(request, *args, **kwargs)， 它会理所应当的去多重继承的父类中，去找寻方法，然后执行，跟踪代码会进入到ListModelMixin类
class ListModelMixin(object): """ List a queryset. """ def list(self, request, *args, **kwargs): queryset = self.filter_queryset(self.get_queryset()) page = self.paginate_queryset(queryset) if page is not None: serializer = self.get_serializer(page, many=True) return self.get_paginated_response(serializer.data) serializer = self.get_serializer(queryset, many=True) return Response(serializer.data)ListModelMixin类list方法是获取了queryset = self.filter_queryset(self.get_queryset())，这个queryset是在GenericAPIView类中，我前面列举了一些该类的方法， 然后在判断是否分页，最后获取self.get_serializer(queryset, many=True)序列化类，最后将序列化后的结果serializer.data作为返回return Response(serializer.data)返回即可
以上就是http://127.0.0.1:8000/books/(get方法)查询所有的记录
对应BookView里面的post方法代码如下，流程大同小异 http://127.0.0.1:8000/books/(post方法）添加记录
def post(self, request, *args, **kwargs): return self.create(request, *args, **kwargs)跟进如下代码：
class CreateModelMixin(object): """ Create a model instance. """ def create(self, request, *args, **kwargs): serializer = self.get_serializer(data=request.data) serializer.is_valid(raise_exception=True) self.perform_create(serializer) headers = self.get_success_headers(serializer.data) return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers) def perform_create(self, serializer): serializer.save() def get_success_headers(self, data): try: return {'Location': str(data[api_settings.URL_FIELD_NAME])} except (TypeError, KeyError): return {}依然是从GenericAPIView多重继承类中获取序列化器，然后进行校验request请求的json数据或者form数据，然后进行serializer.save() 用户Token验证，并且通过return {'Location': str(data[api_settings.URL_FIELD_NAME])}保存一个临时头部数据，最后 将序列化的数据，响应状态码（201 Created:请求已经被实现）、头部一并返回即可
return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)以上就是http://127.0.0.1:8000/books/(post方法)添加操作
接下来简单看下单条数据的获取、更新、删除，先把视图代码贴出来
class BookViewDetail( mixins.RetrieveModelMixin, mixins.DestroyModelMixin, mixins.UpdateModelMixin, generics.GenericAPIView ): queryset = Book.objects.all() serializer_class = BookSerializers def get(self,request, *args, **kwargs): ret = self.get_object() print("ret~~~~~~~~~", ret) return self.retrieve(request, *args, **kwargs) def delete(self,request, *args, **kwargs): return self.destroy(request, *args, **kwargs) def put(self,request, *args, **kwargs): return self.update(request, *args, **kwargs)执行流程也是大同小异 获取单条数据时候，http://127.0.0.1:8000/bookdetail/7（get请求） 执行get方法也是从GenericAPIView多重继承类中获取get_object，然后进行序列化，最后 return Response(serializer.data)返回即可
class RetrieveModelMixin(object): """ Retrieve a model instance. """ def retrieve(self, request, *args, **kwargs): instance = self.get_object() serializer = self.get_serializer(instance) return Response(serializer.data)接下来看下更新操作http://127.0.0.1:8000/bookdetail/7（put请求）
def put(self,request, *args, **kwargs): return self.update(request, *args, **kwargs) class UpdateModelMixin(object): """ Update a model instance. """ def update(self, request, *args, **kwargs): partial = kwargs.pop('partial', False) instance = self.get_object() serializer = self.get_serializer(instance, data=request.data, partial=partial) serializer.is_valid(raise_exception=True) self.perform_update(serializer) if getattr(instance, '_prefetched_objects_cache', None): # If 'prefetch_related' has been applied to a queryset, we need to # forcibly invalidate the prefetch cache on the instance. instance._prefetched_objects_cache = {} return Response(serializer.data) def perform_update(self, serializer): serializer.save() def partial_update(self, request, *args, **kwargs): kwargs['partial'] = True return self.update(request, *args, **kwargs)意思通过instance = self.get_object()获取要修改的数据，然后get_serializer拿到序列化器、进行请求数据合法校验、然后通过Token进行用户验证、然后将更新好的数据返回return Response(serializer.data)
接下来看下删除操作http://127.0.0.1:8000/bookdetail/7（delete删除请求）
def delete(self,request, *args, **kwargs): return self.destroy(request, *args, **kwargs) class DestroyModelMixin(object): """ Destroy a model instance. """ def destroy(self, request, *args, **kwargs): instance = self.get_object() self.perform_destroy(instance) return Response(status=status.HTTP_204_NO_CONTENT) def perform_destroy(self, instance): instance.delete()通过pk(或者其他标识)获取要删除的数据，然后instance.delete()删除，最后返回return Response(status=status.HTTP_204_NO_CONTENT) HTTP 204(no content)表示响应执行成功,但没有数据返回,浏览器不用刷新
以上就是mixins模块源码分析
我们还可以利用如下更简单的方式
from rest_framework import generics class BookView(generics.ListCreateAPIView): queryset = Book.objects.all() serializer_class = BookSerializers class BookViewDetail(generics.RetrieveUpdateDestroyAPIView): queryset = Book.objects.all() serializer_class = BookSerializers我们就看BookView即可原来继承如下的类，进行了再次的封装，代码更精简
class ListCreateAPIView(mixins.ListModelMixin, mixins.CreateModelMixin, GenericAPIView): """ Concrete view for listing a queryset or creating a model instance. """ def get(self, request, *args, **kwargs): return self.list(request, *args, **kwargs) def post(self, request, *args, **kwargs): return self.create(request, *args, **kwargs)