对于具有ImageField的模型,'getattr():属性名称必须是管理面板中的字符串'错误

Question

我有以下模型设置:

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

它应该存储关于用户的附加信息,例如化身.

不幸的是,当我尝试通过管理面板上传图片时,它会给我一个错误,例如:

getattr(): attribute name must be string

当我从模型中删除该字段时,不生成哪个,执行db重置并重新加载服务器.我想原因是这个特殊的领域,只是不确定如何.

这是我的追溯:

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

你的问题是height_field=80和width_field=80这些不应该包含的高度和宽度您需要,但你的模型字段可以有高度和宽度值保存在其中的相当的名字.

正如ImagedField的Django文档中所解释的那样,这些是模型上的属性,将在保存模型时为您填充.如果您希望为您填充此信息,则可以存储此信息的创建模型属性,否则只需删除这些属性,它们是可选的.

Answer 2

问题可能是这样的:

height_field=80, width_field=80

height_field并且width_field,如果您使用它们,则应该是模型中包含高度和宽度信息的字段的名称.解决这个问题它应该工作.