ValueError: Field 'id' expected a number but got 'deleted "" ' - Django Generic DeleteView

Question

我一直在尝试删除这个模型对象，但我一直收到这个错误：

Field 'id' expected a number but got 'deleted template'

我尝试从管理员端删除该对象（认为这是我的观点的问题）但错误仍然存在。

型号


class TransactionalTemplate(models.Model):
    name = models.CharField(_('name'), max_length=30)
    role = models.ForeignKey(Group, on_delete=models.CASCADE, verbose_name=_('role'))
    content = models.TextField(_('body'))
    category= models.CharField(_('category'), max_length=10, choices=CATEGORIES)

    def __str__(self):
        return self.name

    def get_absolute_url(self):
        return reverse('mail_and_sms:template_list')

    def get_role(self):
        return self.role

观看次数


class TemplateDeleteView(DeleteView):
    model = TransactionalTemplate
    template_name = 'template_confirm_delete.html'
    success_message = _('was sucessfully deleted')


    def delete(self, request, *args, **kwargs):
        messages.success(request, f'{self.get_object()} {self.success_message}')
        self.get_object().delete()
        return redirect('mail_and_sms:template_list')

编辑

下面是回溯

回溯：


Traceback (most recent call last):
  File "/home/abdoul/Desktop/DevWork/c_env/lib/python3.7/site-packages/django/db/models/fields/__init__.py", line 1772, in get_prep_value
    return int(value)

The above exception (invalid literal for int() with base 10: 'deleted template') was the direct cause of the following exception:
  File "/home/abdoul/Desktop/DevWork/c_env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/home/abdoul/Desktop/DevWork/c_env/lib/python3.7/site-packages/django/core/handlers/base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/abdoul/Desktop/DevWork/c_env/lib/python3.7/site-packages/django/core/handlers/base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/abdoul/Desktop/DevWork/c_env/lib/python3.7/site-packages/django/views/generic/base.py", line 71, in view
    return self.dispatch(request, *args, **kwargs)
  File "/home/abdoul/Desktop/DevWork/c_env/lib/python3.7/site-packages/django/utils/decorators.py", line 43, in _wrapper
    return bound_method(*args, **kwargs)
  File "/home/abdoul/Desktop/DevWork/c_env/lib/python3.7/site-packages/django/contrib/auth/decorators.py", line 21, in _wrapped_view
    return view_func(request, *args, **kwargs)
  File "/home/abdoul/Desktop/DevWork/c/mail_and_sms/views.py", line 75, in dispatch
    return super(TemplateDeleteView, self).dispatch(request, *args, **kwargs)
  File "/home/abdoul/Desktop/DevWork/c_env/lib/python3.7/site-packages/django/views/generic/base.py", line 97, in dispatch
    return handler(request, *args, **kwargs)
  File "/home/abdoul/Desktop/DevWork/c_env/lib/python3.7/site-packages/django/views/generic/edit.py", line 218, in post
    return self.delete(request, *args, **kwargs)
  File "/home/abdoul/Desktop/DevWork/c/mail_and_sms/views.py", line 67, in delete
    self.get_object().delete()
  File "/home/abdoul/Desktop/DevWork/c_env/lib/python3.7/site-packages/django/db/models/base.py", line 938, in delete
    return collector.delete()
  File "/home/abdoul/Desktop/DevWork/c_env/lib/python3.7/site-packages/django/db/models/deletion.py", line 322, in delete
    {field.name: value}, self.using)
  File "/home/abdoul/Desktop/DevWork/c_env/lib/python3.7/site-packages/django/db/models/sql/subqueries.py", line 107, in update_batch
    self.get_compiler(using).execute_sql(NO_RESULTS)
  File "/home/abdoul/Desktop/DevWork/c_env/lib/python3.7/site-packages/django/db/models/sql/compiler.py", line 1492, in execute_sql
    cursor = super().execute_sql(result_type)
  File "/home/abdoul/Desktop/DevWork/c_env/lib/python3.7/site-packages/django/db/models/sql/compiler.py", line 1131, in execute_sql
    sql, params = self.as_sql()
  File "/home/abdoul/Desktop/DevWork/c_env/lib/python3.7/site-packages/django/db/models/sql/compiler.py", line 1458, in as_sql
    val = field.get_db_prep_save(val, connection=self.connection)
  File "/home/abdoul/Desktop/DevWork/c_env/lib/python3.7/site-packages/django/db/models/fields/related.py", line 939, in get_db_prep_save
    return self.target_field.get_db_prep_save(value, connection=connection)
  File "/home/abdoul/Desktop/DevWork/c_env/lib/python3.7/site-packages/django/db/models/fields/__init__.py", line 821, in get_db_prep_save
    return self.get_db_prep_value(value, connection=connection, prepared=False)
  File "/home/abdoul/Desktop/DevWork/c_env/lib/python3.7/site-packages/django/db/models/fields/__init__.py", line 2365, in get_db_prep_value
    value = self.get_prep_value(value)
  File "/home/abdoul/Desktop/DevWork/c_env/lib/python3.7/site-packages/django/db/models/fields/__init__.py", line 1776, in get_prep_value
    ) from e

Exception Type: ValueError at /app/mailandsms/template/delete/9/
Exception Value: Field 'id' expected a number but got 'deleted template'.

感谢任何帮助。

谢谢。

Answer 1

我设法了解问题出在哪里。

有一个 ForeignKey 指向带有 on_delete=models.SET_DEFAULT 和 default='deleted template' 的 TransactionalTemplate 模型。它被定义如下：

class Outbox(models.Model):
    template = models.ForeignKey(TransactionalTemplate, 
               on_delete=models.SET_DEFAULT, default='deleted template', verbose_name=_('template')) ---- > here
    recipients = models.ManyToManyField(settings.AUTH_USER_MODEL, verbose_name=_('recipients'))
    timestamp = models.DateTimeField(auto_now_add=True)
    subject = models.CharField(_('subject'), max_length=255)
    message = models.TextField(_('message'))

删除与 Inbox 模型中另一个对象相关的 TransactionalTemplate 对象时，django 会尝试通过将其值设置为 [=17= 的值来维护相关对象]，它期望数字 (int) 是默认值，但它所能找到的只是字符串 'deleted template'，因此引发 ValueError.

所以我为消除错误所做的一切是：

将on_delete=models.SET_NULL更改为on_delete=models.CASCADE
移除default='deleted template'
./manage.py makemigrations 和 migrate
最后编辑迁移文件以将初始默认值更改为数字

Answer 2

已解决 根据您的错误：

Exception Value: Field 'id' expected a number but got 'deleted template'.

您必须在视图中为 id 参数发送数字，但您发送了错误的字符串值 "deleted template"

更改您的输入值。并 再次测试。

ValueError: Field 'id' expected a number but got 'deleted "" ' - Django Generic DeleteView

ValueError: Field 'id' expected a number but got 'deleted "" ' - Django Generic DeleteView

django

django-generic-views