文件未上传 django drf答案

【问题标题】：File not uploading django drf文件未上传 django drf
【发布时间】：2020-01-04 10:28:02
【问题描述】：

我正在尝试使用 drf 从反应前端上传图像这是我得到的错误：

ValueError: Cannot assign "1": "ProjectImage.category" must be a "ProjectCategory" instance.

models.py：

class ProjectCategory(MPTTModel):
     name = models.CharField(max_length = 100)
     slug = models.SlugField()
     parent = TreeForeignKey('self',blank=True, null=True, related_name='children', on_delete=models.CASCADE, db_index = True)


class MPTTMeta:
    verbose_name_plural = "Projectcategories"
    order_insertion_by = ['name']

    def __str__(self):  
        full_path = [self.name]
        k = self.parent
        while k is not None:
             full_path.append(k.name)
             k = k.parent
        return ' -> '.join(full_path[::-1])

class ProjectImage(models.Model):
      title = models.CharField(max_length = 100)
      image = models.ImageField(upload_to = 'media' , default = 'home/tboss/Desktop/image/logo.png')
      category = models.ForeignKey('ProjectCategory', null=True, blank=True, on_delete=models.CASCADE,)
      description = models.TextField(max_length=1000)

      def __str__(self):
          return self.title

views.py：

class ProjectImageUploadView(APIView):
      authentication_classes = []
      permission_classes = []
     def post(self, request,category):
         file = request.data['file']
         data={
            'image':file,
            'category':category
         }

    ProjectImage.objects.create(**data)
    return JsonResponse(json.dumps({'message': "Uploaded"}), status=200, safe=False)

    def __str__(self):
        return self.title

urls.py:

path('projectuploadimage/<int:category>/', views.ProjectImageUploadView.as_view()),

我想在类别中上传多张图片...................................... ..........

【问题讨论】：

标签： django python-3.x django-rest-framework

【解决方案1】：

您应该将category_id 传递给ProjectImage 模型，因为它是一个整数：

class ProjectImageUploadView(APIView):
     authentication_classes = []
     permission_classes = []
     def post(self, request,category):
         file = request.data['file']
         data={
            'image':file,
            'category_id':category
         }

    ProjectImage.objects.create(**data)
    return JsonResponse(json.dumps({'message': "Uploaded"}), status=200, safe=False)

    def __str__(self):
        return self.title

或者，您可以发送关联的类别：

class ProjectImageUploadView(APIView):
     authentication_classes = []
     permission_classes = []
     def post(self, request,category):
         file = request.data['file']
         data={
            'image':file,
            'category':ProjectCategory.objects.get(pk=category)
         }

    ProjectImage.objects.create(**data)
    return JsonResponse(json.dumps({'message': "Uploaded"}), status=200, safe=False)

    def __str__(self):
        return self.title

【讨论】：