drf mixins的五大类

ListModelMixin

源码

class ListModelMixin:
    """
    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)

view

class BlogView(ListModelMixin,  GenericViewSet):
    queryset = models.Blog.objects.order_by('-id').all()
    serializer_class = BlogModelSerializer
    pagination_class = MyPageNumberPagination

作用

代替查询所有列表的view操作

RetrieveModelMixin

源码

class RetrieveModelMixin:
    """
    Retrieve a model instance.
    """
    def retrieve(self, request, *args, **kwargs):
        instance = self.get_object()
        serializer = self.get_serializer(instance)
        return Response(serializer.data)

view

class BlogView( RetrieveModelMixin, GenericViewSet):
    queryset = models.Blog.objects.order_by('-id').all()
    serializer_class = BlogModelSerializer
    pagination_class = MyPageNumberPagination

作用

代替查询单个数据的view操作

CreateModelMixin

源码

class CreateModelMixin:
    """
    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 {}

view

class RegisterView(CreateModelMixin, GenericViewSet):

    queryset = models.UserInfo.objects.all()
    serializer_class = RegisterModelSerializer
    pagination_class = PageNumberPagination
    # 重写perform_create
    def perform_create(self, serializer):
        serializer.validated_data.pop("confirm_password")
        serializer.save()

作用

代替创建单个数据的view操作

UpdateModelMixin

源码

class UpdateModelMixin:
    """
    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)

view

class RegisterView(UpdateModelMixin, GenericViewSet):

    queryset = models.UserInfo.objects.all()
    serializer_class = RegisterModelSerializer
    pagination_class = PageNumberPagination

路由

# 'put': 'update', 全量更新
# 'patch': 'partial_update' 部分更新
urlpatterns = [
    path('register/<int:pk>/',
         commonViews.RegisterView.as_view({'get': 'retrieve', 'put': 'update', 'patch': 'partial_update'}),
         name='register'),
]

作用

代替更新单个数据的view操作

结果

UpdateModelMixin

源码

class DestroyModelMixin:
    """
    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()

view

class RegisterView( GenericViewSet,DestroyModelMixin):
    queryset = models.UserInfo.objects.all()
    serializer_class = RegisterModelSerializer
    pagination_class = PageNumberPagination
    #自定义改状态删除
    def perform_destroy(self, instance):
        intance.status = 1
        instance.save()

路由

    path('register/<int:pk>/',
         commonViews.RegisterView.as_view( {'delete': 'destroy'}),name='register'),

作用

代替删除单个数据的view操作

结果