“getattr（）：对于带有ImageField的模型，管理面板中的属性名必须为string”错误

Question

我设置了以下模型：

class UserProfile(models.Model):
    "Additional attributes for users."
    url = models.URLField()
    location = models.CharField(max_length=100)
    user = models.ForeignKey(User, unique=True)
    avatar = models.ImageField(upload_to='/home/something/www/avatars', height_field=80, width_field=80)

    def __unicode__(self):
        return "Profile of " + self.user.username

它应该存储有关用户的附加信息，例如化身。

不幸的是，当我试图通过管理面板上传图像时，它会给我一个错误，比如：

getattr(): attribute name must be string

当我从模型中删除该字段时，不会生成该字段，请执行db reset并重新加载服务器。我想原因是这个特殊的领域，只是不知道如何。

这是我的回溯：

File "/usr/lib/pymodules/python2.6/django/core/handlers/base.py" in get_response
  92.                 response = callback(request, *callback_args, **callback_kwargs)
File "/usr/lib/pymodules/python2.6/django/contrib/admin/options.py" in wrapper
  226.                 return self.admin_site.admin_view(view)(*args, **kwargs)
File "/usr/lib/pymodules/python2.6/django/views/decorators/cache.py" in _wrapped_view_func
  44.         response = view_func(request, *args, **kwargs)
File "/usr/lib/pymodules/python2.6/django/contrib/admin/sites.py" in inner
  186.             return view(request, *args, **kwargs)
File "/usr/lib/pymodules/python2.6/django/db/transaction.py" in _commit_on_success
  240.                 res = func(*args, **kw)
File "/usr/lib/pymodules/python2.6/django/contrib/admin/options.py" in add_view
  718.                 new_object = self.save_form(request, form, change=False)
File "/usr/lib/pymodules/python2.6/django/contrib/admin/options.py" in save_form
  551.         return form.save(commit=False)
File "/usr/lib/pymodules/python2.6/django/forms/models.py" in save
  407.                              fail_message, commit, exclude=self._meta.exclude)
File "/usr/lib/pymodules/python2.6/django/forms/models.py" in save_instance
  65.         f.save_form_data(instance, cleaned_data[f.name])
File "/usr/lib/pymodules/python2.6/django/db/models/fields/files.py" in save_form_data
  283.             setattr(instance, self.name, data)
File "/usr/lib/pymodules/python2.6/django/db/models/fields/files.py" in __set__
  316.             self.field.update_dimension_fields(instance, force=True)
File "/usr/lib/pymodules/python2.6/django/db/models/fields/files.py" in update_dimension_fields
  368.             (self.width_field and not getattr(instance, self.width_field))

Exception Type: TypeError at /admin/proj/userprofile/add/
Exception Value: getattr(): attribute name must be string

Answer 1

您的问题是height_field=80和width_field=80它们不应该包含您需要的高度和宽度，而应该包含模型中可以保存高度和宽度值的字段的名称。

正如Django文档中对ImagedField的解释，这些是模型上的属性，在保存模型时将为您填充这些属性。如果希望为您填充此信息，可以在其中存储此信息的create model属性，否则只需删除这些属性，它们是可选的。