python - Django 'bool' 对象在模型保存时不可迭代

Question

我正在尝试更新我的模型，因此当通过管理员检查 BooleanField 时，它会更新所有其他行以重置为 False (0)。但是当我继续这样做时，它只会返回以下 TypeError: 'bool' object is not iterable

这是我的模型:

class Contact(models.Model):
    name            = models.CharField(max_length=255)
    telephone       = models.CharField(max_length=255,blank=True)
    email           = models.CharField(max_length=255,blank=True)
    primary_contact = models.BooleanField('Primary Contact')

    def __unicode__(self):
        return self.name

    def make_primary(self):
        Contact.objects.filter(id!=self.id).update(primary_contact=False)

    def save(self, *args, **kwargs):
        if (self.primary_contact == True):
            self.make_primary()
        super(Contact, self).save(*args, **kwargs)

我正在尝试使用名为 make_primary() 的自定义方法在 save() 期间更新我的行。感觉就像我需要做的事情非常简单明了。我是 Django 的新手，所以它有点学习曲线。

如有任何帮助和建议，我们将不胜感激。

谢谢:)

编辑:

根据这里的要求，下面是我的回溯/错误。此外，我更新了我的代码以使用 exclude 代替，并且错误已更改为:'long' object is not iterable

Environment:


Request Method: POST
Request URL: http://localhost:8000/admin/contact/contact/1/

Django Version: 1.8.2
Python Version: 2.7.6
Installed Applications:
('grappelli',
 'django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'tinymce',
 'adminsortable',
 'taggit',
 'contact')
Installed Middleware:
('django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'django.middleware.security.SecurityMiddleware')


Traceback:
File "/Library/Python/2.7/site-packages/django/core/handlers/base.py" in get_response
  132.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Library/Python/2.7/site-packages/django/contrib/admin/options.py" in wrapper
  616.                 return self.admin_site.admin_view(view)(*args, **kwargs)
File "/Library/Python/2.7/site-packages/django/utils/decorators.py" in _wrapped_view
  110.                     response = view_func(request, *args, **kwargs)
File "/Library/Python/2.7/site-packages/django/views/decorators/cache.py" in _wrapped_view_func
  57.         response = view_func(request, *args, **kwargs)
File "/Library/Python/2.7/site-packages/django/contrib/admin/sites.py" in inner
  233.             return view(request, *args, **kwargs)
File "/Library/Python/2.7/site-packages/adminsortable/admin.py" in change_view
  231.             form_url='', extra_context=extra_context)
File "/Library/Python/2.7/site-packages/django/contrib/admin/options.py" in change_view
  1519.         return self.changeform_view(request, object_id, form_url, extra_context)
File "/Library/Python/2.7/site-packages/django/utils/decorators.py" in _wrapper
  34.             return bound_func(*args, **kwargs)
File "/Library/Python/2.7/site-packages/django/utils/decorators.py" in _wrapped_view
  110.                     response = view_func(request, *args, **kwargs)
File "/Library/Python/2.7/site-packages/django/utils/decorators.py" in bound_func
  30.                 return func.__get__(self, type(self))(*args2, **kwargs2)
File "/Library/Python/2.7/site-packages/django/utils/decorators.py" in inner
  145.                     return func(*args, **kwargs)
File "/Library/Python/2.7/site-packages/django/contrib/admin/options.py" in changeform_view
  1467.                 self.save_model(request, new_object, form, not add)
File "/Library/Python/2.7/site-packages/django/contrib/admin/options.py" in save_model
  1078.         obj.save()
File "/Users/[hidden]/Sites/[hidden]/contact/models.py" in save
  37.           self.make_primary()
File "/Users/[hidden]/Sites/[hidden]/contact/models.py" in make_primary
  28.       for oc in other_contacts:

Exception Type: TypeError at /admin/contact/contact/1/
Exception Value: 'long' object is not iterable

Answer 1

此行无效:

MyModel.objects.filter(id!=self.id)

当您执行 id!=self.id 时，表达式的计算结果为 False，因此它与执行 filter(False) 相同.这是您的回溯消息中“不可迭代”的 bool 对象，它实际上与您的 BooleanField 没有任何关系。

当您执行 filter(id=self.id) 时，您将关键字参数传递给 filter 方法。 Django 没有办法将不等于作为过滤器中的关键字参数。您可以使用 exclude()相反。

MyModel.objects.exclude(id=self.id)