使用Image.copy递归deepcopy的

  • Z时代
  • 2024-01-10
  • 分类：问答

我有这个模型复制构造器basemodel：使用Image.copy递归deepcopy的

class BaseModel(models.Model): 
    def __init__(self, *args, **kwargs): 
     super().__init__(*args, **kwargs) 
     self.original = copy.deepcopy(self

我的问题是，一些车型有ImageField的，当我尝试复制，我得到AttributeError的。我发现这个错误的解决方案here，说“使用image.copy（），而不是copy.deepcopy（）。

我可以实现image.copy（）在递归deepcopy当字段是图像？

非常感谢

编辑：这是跟踪：

Traceback: 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/site-packages/PIL/ImageFile.py" in load 
139. read = self.load_read 
During handling of the above exception ('JpegImageFile' object has no attribute 'load_read'), another exception occurred: 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/site-packages/django/core/handlers/exception.py" in inner 
39. response = get_response(request) 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/site-packages/django/core/handlers/base.py" in _get_response 
187. response = self.process_exception_by_middleware(e, request) 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/site-packages/django/core/handlers/base.py" in _get_response 
185. response = wrapped_callback(request, *callback_args, **callback_kwargs) 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/site-packages/django/views/decorators/csrf.py" in wrapped_view 
58. return view_func(*args, **kwargs) 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/site-packages/django/views/generic/base.py" in view 
68. return self.dispatch(request, *args, **kwargs) 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/site-packages/rest_framework/views.py" in dispatch 
477. response = self.handle_exception(exc) 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/site-packages/rest_framework/views.py" in handle_exception 
437. self.raise_uncaught_exception(exc) 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/site-packages/rest_framework/views.py" in dispatch 
474. response = handler(request, *args, **kwargs) 
File "/home/imontilla/PycharmProjects/api/apps/chats/api.py" in put 
107. return self.response_or_errors(serializer, respond_with=serializers.ChatMessageOutputSerializer) 
File "/home/imontilla/PycharmProjects/api/apps/core/generics.py" in response_or_errors 
31. instance = serializer.save(**kwargs) 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/site-packages/rest_framework/serializers.py" in save 
214. self.instance = self.create(validated_data) 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/site-packages/rest_framework/serializers.py" in create 
902. instance = ModelClass.objects.create(**validated_data) 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/site-packages/django/db/models/manager.py" in manager_method 
85. return getattr(self.get_queryset(), name)(*args, **kwargs) 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/site-packages/django/db/models/query.py" in create 
397. obj = self.model(**kwargs) 
File "/home/imontilla/PycharmProjects/api/apps/core/models.py" in __init__ 
22. self.original_instance = copy.deepcopy(self) 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/copy.py" in deepcopy 
182. y = _reconstruct(x, rv, 1, memo) 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/copy.py" in _reconstruct 
297. state = deepcopy(state, memo) 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/copy.py" in deepcopy 
155. y = copier(x, memo) 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/copy.py" in _deepcopy_dict 
243. y[deepcopy(key, memo)] = deepcopy(value, memo) 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/copy.py" in deepcopy 
182. y = _reconstruct(x, rv, 1, memo) 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/copy.py" in _reconstruct 
297. state = deepcopy(state, memo) 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/copy.py" in deepcopy 
155. y = copier(x, memo) 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/copy.py" in _deepcopy_dict 
243. y[deepcopy(key, memo)] = deepcopy(value, memo) 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/copy.py" in deepcopy 
174. rv = reductor(4) 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/site-packages/PIL/Image.py" in __getstate__ 
639. self.getpalette(), 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/site-packages/PIL/Image.py" in getpalette 
1196. self.load() 
File "/home/imontilla/.virtualenvs/petycash-django/lib/python3.5/site-packages/PIL/ImageFile.py" in load 
143. read = self.fp.read 
Exception Type: AttributeError at /chats/6fbd9f3e87f945b99969b2c53e35eb66/messages/image/ 
Exception Value: 'NoneType' object has no attribute 'read'

回答：

我认为最好的方法是一种方法copy添加到您的类中的这个方法，你可以控制的方式复制具有不同类型的对象。

class BaseModel(models.Model): 
    def __init__(self, *args, **kwargs): 
     super().__init__(*args, **kwargs) 
     self.original = self.copy() 
    def copy(self): 
     clone = copy.copy(self) # to copy __dict__ only 
     for key, value in clone.__dict__.items(): 
      if isinstance(value, BaseModel): 
       clone.__dict__[key] = value.copy() # recoursively 
      elif isinstance(value, Image): 
       clone.__dict__[key] = value.copy() 
      else: 
       clone.__dict__[key] = copy.deepcopy(value) 
     return clone

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