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  • GenericAPIView类与几个扩展类的综合使用

    • 五个扩展类

    扩展类作用封装的方法状态码(成功,失败)
    ListModelMixin 查询多条数据 list 200
    CreateModelMixin 新增一条数据 create 201,400
    RetrieveModelMixin 查询一条数据 retrieve 200,404
    UpdateModelMixin 更新一条数据 update,partial_update 200,400
    DestroyModelMixin 删除一条数据 destroy 204,404

    这五个扩展类需要搭配GenericAPIView (或者GenericViewSet)一起使用:五个扩展类的需要调用GenericAPIView提供的序列化器与数据库查询的方法。

    • 使用方法

    class DepartmentListAPIView(ListModelMixin,CreateModelMixin,GenericAPIView):
    
        queryset = Department.objects.all()
        serializer_class = DepartmentSerializer
    
        def get(self,request):
            """查询多条数据"""
            return self.list(request)
    
        def post(self,request):
            """新增一条数据"""
            return self.create(request)
    
    class DepartmentDetailAPIView(RetrieveModelMixin,UpdateModelMixin,DestroyModelMixin,GenericAPIView):
    
        queryset = Department.objects.all()
        serializer_class = DepartmentSerializer
    
        def get(self,request,pk):
            """查询一条数据"""
            return self.retrieve(request,pk)
    
        def post(self,request,pk):
            """修改部门"""
            return self.update(request,pk)
    
        def delete(self,request,pk):
            """删除一个部门"""
            return self.destroy(request,pk)
    • 五个扩展类的源代码

    """
    Basic building blocks for generic class based views.
    
    We don't bind behaviour to http method handlers yet,
    which allows mixin classes to be composed in interesting ways.
    """
    from __future__ import unicode_literals
    
    from rest_framework import status
    from rest_framework.response import Response
    from rest_framework.settings import api_settings
    
    
    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 {}
    
    
    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)
    
    
    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)
    
    
    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)
    
    
    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()
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  • 原文地址:https://www.cnblogs.com/chichung/p/9941416.html
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