Django: изменение значения записи перед ее удалением - PullRequest
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Django: изменение значения записи перед ее удалением

0 голосов
/ 08 октября 2018

Я пытаюсь изменить одно из полей записи перед удалением: 

query_item.txId = txId
try:
    query_item.delete()
except Exception as e:
        print(str(e))

Дело в том, что написанный выше код вызывает исключение:

Произошла ошибка втекущая транзакция.Вы не можете выполнять запросы до конца атомарного блока.

Я пытался поиграть с оператором 

with transaction.atomic():

, но это ничего не изменило.

Более того, следующая комбинация: 

query_item.txId = txId
query_item.save()
try:
    query_item.delete()
except Exception as e:
        print(str(e))

по-прежнему вызывает ту же ошибку

@ edit

во всем проекте, на который указывает только один сигналзаписи, принадлежащие модели query_item: 

pre_delete.connect(create_receipts, sender=itemToPurchase)

@ edit2

Это определенно что-то не так с сигналом pre_delete

Я просто удалил его, и тест прошел гладко ихорошо.

В любом случае, когда я использую вышеприведенный сигнал и удаляю все операторы try-кроме, я получаю следующий журнал ошибок: 

Traceback (most recent call last):
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "User/env/lib/python3.7/site-packages/django/core/handlers/base.py", line 126, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "User/env/lib/python3.7/site-packages/django/core/handlers/base.py", line 124, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/lib/python3.7/contextlib.py", line 74, in inner
    return func(*args, **kwds)
  File "User/env/lib/python3.7/site-packages/django/views/generic/base.py", line 68, in view
    return self.dispatch(request, *args, **kwargs)
  File "User/env/lib/python3.7/site-packages/django/views/generic/base.py", line 88, in dispatch
    return handler(request, *args, **kwargs)
  File "User/profilespaidbybtc/payment_realizer/views.py", line 240, in post
    query_item.delete()
  File "User/env/lib/python3.7/site-packages/django/db/models/base.py", line 880, in delete
    return collector.delete()
  File "User/env/lib/python3.7/site-packages/django/db/models/deletion.py", line 277, in delete
    sender=model, instance=obj, using=self.using
  File "User/env/lib/python3.7/site-packages/django/dispatch/dispatcher.py", line 175, in send
    for receiver in self._live_receivers(sender)
  File "User/env/lib/python3.7/site-packages/django/dispatch/dispatcher.py", line 175, in <listcomp>
    for receiver in self._live_receivers(sender)
  File "User/profilespaidbybtc/receipt/models.py", line 186, in create_receipts
    'token': hash_generator_token.make_token(instance_receiptModel)
  File "User/env/lib/python3.7/site-packages/django/template/loader.py", line 61, in render_to_string
    template = get_template(template_name, using=using)
  File "User/env/lib/python3.7/site-packages/django/template/loader.py", line 15, in get_template
    return engine.get_template(template_name)
  File "User/env/lib/python3.7/site-packages/django/template/backends/django.py", line 34, in get_template
    return Template(self.engine.get_template(template_name), self)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 144, in get_template
    template, origin = self.find_template(template_name)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 124, in find_template
    for loader in self.template_loaders:
  File "User/env/lib/python3.7/site-packages/django/utils/functional.py", line 37, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 98, in template_loaders
    return self.get_template_loaders(self.loaders)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 103, in get_template_loaders
    loader = self.find_template_loader(template_loader)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 116, in find_template_loader
    loader_class = import_string(loader)
  File "User/env/lib/python3.7/site-packages/django/utils/module_loading.py", line 17, in import_string
    module = import_module(module_path)
  File "User/env/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 965, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'app_namespace'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "User/env/lib/python3.7/site-packages/django/utils/deprecation.py", line 91, in __call__
    response = response or self.get_response(request)
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 129, in handle_uncaught_exception
    return callback(request, **param_dict)
  File "User/env/lib/python3.7/site-packages/django/utils/decorators.py", line 142, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "User/env/lib/python3.7/site-packages/django/views/defaults.py", line 69, in server_error
    template = loader.get_template(template_name)
  File "User/env/lib/python3.7/site-packages/django/template/loader.py", line 15, in get_template
    return engine.get_template(template_name)
  File "User/env/lib/python3.7/site-packages/django/template/backends/django.py", line 34, in get_template
    return Template(self.engine.get_template(template_name), self)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 144, in get_template
    template, origin = self.find_template(template_name)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 124, in find_template
    for loader in self.template_loaders:
  File "User/env/lib/python3.7/site-packages/django/utils/functional.py", line 37, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 98, in template_loaders
    return self.get_template_loaders(self.loaders)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 103, in get_template_loaders
    loader = self.find_template_loader(template_loader)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 116, in find_template_loader
    loader_class = import_string(loader)
  File "User/env/lib/python3.7/site-packages/django/utils/module_loading.py", line 17, in import_string
    module = import_module(module_path)
  File "User/env/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 965, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'app_namespace'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "User/env/lib/python3.7/site-packages/django/utils/deprecation.py", line 91, in __call__
    response = response or self.get_response(request)
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 129, in handle_uncaught_exception
    return callback(request, **param_dict)
  File "User/env/lib/python3.7/site-packages/django/utils/decorators.py", line 142, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "User/env/lib/python3.7/site-packages/django/views/defaults.py", line 69, in server_error
    template = loader.get_template(template_name)
  File "User/env/lib/python3.7/site-packages/django/template/loader.py", line 15, in get_template
    return engine.get_template(template_name)
  File "User/env/lib/python3.7/site-packages/django/template/backends/django.py", line 34, in get_template
    return Template(self.engine.get_template(template_name), self)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 144, in get_template
    template, origin = self.find_template(template_name)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 124, in find_template
    for loader in self.template_loaders:
  File "User/env/lib/python3.7/site-packages/django/utils/functional.py", line 37, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 98, in template_loaders
    return self.get_template_loaders(self.loaders)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 103, in get_template_loaders
    loader = self.find_template_loader(template_loader)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 116, in find_template_loader
    loader_class = import_string(loader)
  File "User/env/lib/python3.7/site-packages/django/utils/module_loading.py", line 17, in import_string
    module = import_module(module_path)
  File "User/env/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 965, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'app_namespace'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "User/env/lib/python3.7/site-packages/django/utils/deprecation.py", line 91, in __call__
    response = response or self.get_response(request)
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 129, in handle_uncaught_exception
    return callback(request, **param_dict)
  File "User/env/lib/python3.7/site-packages/django/utils/decorators.py", line 142, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "User/env/lib/python3.7/site-packages/django/views/defaults.py", line 69, in server_error
    template = loader.get_template(template_name)
  File "User/env/lib/python3.7/site-packages/django/template/loader.py", line 15, in get_template
    return engine.get_template(template_name)
  File "User/env/lib/python3.7/site-packages/django/template/backends/django.py", line 34, in get_template
    return Template(self.engine.get_template(template_name), self)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 144, in get_template
    template, origin = self.find_template(template_name)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 124, in find_template
    for loader in self.template_loaders:
  File "User/env/lib/python3.7/site-packages/django/utils/functional.py", line 37, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 98, in template_loaders
    return self.get_template_loaders(self.loaders)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 103, in get_template_loaders
    loader = self.find_template_loader(template_loader)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 116, in find_template_loader
    loader_class = import_string(loader)
  File "User/env/lib/python3.7/site-packages/django/utils/module_loading.py", line 17, in import_string
    module = import_module(module_path)
  File "User/env/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 965, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'app_namespace'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "User/env/lib/python3.7/site-packages/django/utils/deprecation.py", line 91, in __call__
    response = response or self.get_response(request)
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 129, in handle_uncaught_exception
    return callback(request, **param_dict)
  File "User/env/lib/python3.7/site-packages/django/utils/decorators.py", line 142, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "User/env/lib/python3.7/site-packages/django/views/defaults.py", line 69, in server_error
    template = loader.get_template(template_name)
  File "User/env/lib/python3.7/site-packages/django/template/loader.py", line 15, in get_template
    return engine.get_template(template_name)
  File "User/env/lib/python3.7/site-packages/django/template/backends/django.py", line 34, in get_template
    return Template(self.engine.get_template(template_name), self)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 144, in get_template
    template, origin = self.find_template(template_name)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 124, in find_template
    for loader in self.template_loaders:
  File "User/env/lib/python3.7/site-packages/django/utils/functional.py", line 37, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 98, in template_loaders
    return self.get_template_loaders(self.loaders)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 103, in get_template_loaders
    loader = self.find_template_loader(template_loader)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 116, in find_template_loader
    loader_class = import_string(loader)
  File "User/env/lib/python3.7/site-packages/django/utils/module_loading.py", line 17, in import_string
    module = import_module(module_path)
  File "User/env/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 965, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'app_namespace'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "User/env/lib/python3.7/site-packages/django/utils/deprecation.py", line 91, in __call__
    response = response or self.get_response(request)
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 129, in handle_uncaught_exception
    return callback(request, **param_dict)
  File "User/env/lib/python3.7/site-packages/django/utils/decorators.py", line 142, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "User/env/lib/python3.7/site-packages/django/views/defaults.py", line 69, in server_error
    template = loader.get_template(template_name)
  File "User/env/lib/python3.7/site-packages/django/template/loader.py", line 15, in get_template
    return engine.get_template(template_name)
  File "User/env/lib/python3.7/site-packages/django/template/backends/django.py", line 34, in get_template
    return Template(self.engine.get_template(template_name), self)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 144, in get_template
    template, origin = self.find_template(template_name)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 124, in find_template
    for loader in self.template_loaders:
  File "User/env/lib/python3.7/site-packages/django/utils/functional.py", line 37, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 98, in template_loaders
    return self.get_template_loaders(self.loaders)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 103, in get_template_loaders
    loader = self.find_template_loader(template_loader)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 116, in find_template_loader
    loader_class = import_string(loader)
  File "User/env/lib/python3.7/site-packages/django/utils/module_loading.py", line 17, in import_string
    module = import_module(module_path)
  File "User/env/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 965, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'app_namespace'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "User/env/lib/python3.7/site-packages/django/utils/deprecation.py", line 91, in __call__
    response = response or self.get_response(request)
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "User/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 129, in handle_uncaught_exception
    return callback(request, **param_dict)
  File "User/env/lib/python3.7/site-packages/django/utils/decorators.py", line 142, in _wrapped_view
    response = view_func(request, *args, **kwargs)
  File "User/env/lib/python3.7/site-packages/django/views/defaults.py", line 69, in server_error
    template = loader.get_template(template_name)
  File "User/env/lib/python3.7/site-packages/django/template/loader.py", line 15, in get_template
    return engine.get_template(template_name)
  File "User/env/lib/python3.7/site-packages/django/template/backends/django.py", line 34, in get_template
    return Template(self.engine.get_template(template_name), self)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 144, in get_template
    template, origin = self.find_template(template_name)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 124, in find_template
    for loader in self.template_loaders:
  File "User/env/lib/python3.7/site-packages/django/utils/functional.py", line 37, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 98, in template_loaders
    return self.get_template_loaders(self.loaders)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 103, in get_template_loaders
    loader = self.find_template_loader(template_loader)
  File "User/env/lib/python3.7/site-packages/django/template/engine.py", line 116, in find_template_loader
    loader_class = import_string(loader)
  File "User/env/lib/python3.7/site-packages/django/utils/module_loading.py", line 17, in import_string
    module = import_module(module_path)
  File "User/env/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 965, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'app_namespace'

During handling of the above exception, another exception occurred:

1 Ответ

0 голосов
/ 08 октября 2018

Я не могу дать вам решение.Но трассировка показывает, что есть ошибка в функции обработчика сигнала.В частности, эта строка: 

File "User/profilespaidbybtc/receipt/models.py", line 186, in create_receipts
  'token': hash_generator_token.make_token(instance_receiptModel)

Django обрабатывает как pre_delete, post_delete, так и удаление в транзакции атомарной базы данных.Таким образом, если в каком-либо из этих шагов есть ошибка, изменения в базу данных не вносятся.Это предотвращает то, что ваши данные оказываются в подвешенном состоянии, потому что вы что-то удалили, но ошибка помешала какой-либо другой очистке или другому.

Чтобы исправить ошибку, вы должны искать некоторый код, который вызывает эту ошибку импорта. 

ModuleNotFoundError: No module named 'app_namespace'

Это связано с каркасом загрузки шаблонов в Django.Я предполагаю, что в функции обработчика сигнала create_receipts происходит рендеринг шаблона, и django не может загрузить модуль app_namespace, чтобы найти файл шаблона.

app_namespace выглядит как имя-заполнитель.Если вы будете искать в базе кода это имя переменной, вы можете найти источник ошибки.Это может быть сочетание неправильного имени шаблона и несуществующего имени модуля или каталога в конфигурации загрузки шаблона django в settings.py.

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