1

我已经在我的 Django 模型上放置了一个 ImageField，并且可以使用预先存在的配置文件（图像上传），但是我无法从管理面板中删除图像，也无法创建新用户。
抛出的错误是：

/admin/custom_user/customuser/1/ 处
的 ValueError 'avatar' 属性没有与之关联的文件。
请求方法：POST
请求 URL： http://localhost:8000/admin/custom_user/customuser/1/
Django 版本：1.8
异常类型：ValueError
异常值：'avatar' 属性没有与之关联的文件。
异常位置：/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/db/models/fields/files.py 在 _require_file，第 46 行
Python 可执行文件：/home/ stefano/projects/blog-project/blogprojectenv/bin/python
Python 版本：2.7.6
Python 路径：
['/home/stefano/projects/blog-project',
'/home/stefano/projects/blog-project/blogprojectenv/lib/python2.7',
'/home/stefano/projects/blog-project/blogprojectenv/lib/python2.7/plat-x86_64-linux-gnu',
'/home/stefano/projects/blog-project/blogprojectenv/lib/python2.7/lib-tk',
'/home/stefano/projects/blog-project/blogprojectenv/lib/python2.7/lib-old',
'/home/stefano/projects/blog-project/blogprojectenv/lib/python2.7/lib-dynload',
'/usr/lib/python2.7',
'/usr/lib/python2.7/plat-x86_64- linux-gnu',
'/usr/lib/python2.7/lib-tk',
'/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages'] 服务器时间： 2016 年 3 月 24 日星期四 13:12:38 +0000

这是模型

class CustomUser(AbstractBaseUser, PermissionsMixin):
    first_name   = models.CharField(max_length=254, blank=True)
    second_name  = models.CharField(max_length=254, blank=True)
    email        = models.EmailField(blank=True, unique=True)
    date_joined  = models.DateTimeField(_('date joined'), default=datetime.now())
    avatar       = models.ImageField('profile picture', upload_to='images/avatars/', null=True, blank=True)
    is_active    = models.BooleanField(default=True)
    is_admin     = models.BooleanField(default=False)
    is_staff     = models.BooleanField(default=False)

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = ['first_name', 'second_name']

    objects = CustomUserManager()

    class Meta:
        verbose_name = _('user')
        verbose_name_plural = _('users')

    def save(self, *args, **kwargs):
        pil_image_obj = Image.open(self.avatar)
        new_image = resizeimage.resize_width(pil_image_obj, 300)

        new_image_io = BytesIO()
        new_image.save(new_image_io, format='JPEG')

        temp_name = self.avatar.name
        self.avatar.delete(save=False)

        self.avatar.save(
            temp_name,
            content=ContentFile(new_image_io.getvalue()),
            save=False
        )

        super(CustomUser, self).save(*args, **kwargs)

我试图将 null=True 和 blank=True 放在模型上，但错误仍然存​​在。我试图将 required=False 放在forms.py中的“ init ”方法上

class CustomUserChangeForm(forms.ModelForm):
    email = forms.EmailField(label='', required=True, widget = forms.TextInput(
        attrs = {
            'placeholder': 'E-Mail',
            'class': 'form-control'
        }
    ))

    first_name = forms.CharField(label='', required=True, widget=forms.TextInput(
        attrs = {
            'placeholder': 'First name',
            'class': 'form-control'
        }
    ))

    second_name = forms.CharField(label='', required=True, widget=forms.TextInput(
        attrs = {
            'placeholder': 'Second name',
            'class': 'form-control'
        }
    ))

    avatar = forms.ImageField(label='', required=False, widget=forms.FileInput(
        attrs = {
            'class': 'form-control',
            'label': 'Profile pic'
        }
    ))

    class Meta:
        model = CustomUser
        fields = ('email', 'first_name', 'second_name', 'avatar')

    def __init__(self, *args, **kwargs):
        self.user = kwargs.pop('user', None)
        super(CustomUserChangeForm, self).__init__(*args, **kwargs)
        self.fields['avatar'].required = False

    def clean_email_address(self):
        email = self.cleaned_data.get('email')
        if self.user and self.user.email == email:
            return email
        if CustomUser.objects.filter(email=email).count():
            raise forms.ValidationError(u'That email address already exists.')
        return email

    def save(self, commit=True):
        user = super(CustomUserChangeForm, self).save(commit=False)
        user.email = self.cleaned_data['email']

        if commit:
            user.save()

        return user

还在那里。

可以做什么？

编辑：这是完整的追溯

Environment:


Request Method: POST
Request URL: http://localhost:8000/admin/custom_user/customuser/1/

Django Version: 1.8
Python Version: 2.7.6
Installed Applications:
('django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'blog',
 'custom_user',
 'django_markdown',
 'parsley')
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 "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  132.                     response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/contrib/admin/options.py" in wrapper
  616.                 return self.admin_site.admin_view(view)(*args, **kwargs)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapped_view
  110.                     response = view_func(request, *args, **kwargs)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/views/decorators/cache.py" in _wrapped_view_func
  57.         response = view_func(request, *args, **kwargs)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/contrib/admin/sites.py" in inner
  233.             return view(request, *args, **kwargs)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/contrib/admin/options.py" in change_view
  1519.         return self.changeform_view(request, object_id, form_url, extra_context)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapper
  34.             return bound_func(*args, **kwargs)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/utils/decorators.py" in _wrapped_view
  110.                     response = view_func(request, *args, **kwargs)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/utils/decorators.py" in bound_func
  30.                 return func.__get__(self, type(self))(*args2, **kwargs2)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/utils/decorators.py" in inner
  145.                     return func(*args, **kwargs)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/contrib/admin/options.py" in changeform_view
  1467.                 self.save_model(request, new_object, form, not add)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/contrib/admin/options.py" in save_model
  1078.         obj.save()
File "/home/stefano/projects/blog-project/custom_user/models.py" in save
  66.       pil_image_obj = Image.open(self.avatar)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/PIL/Image.py" in open
  2261.         fp.seek(0)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/core/files/utils.py" in <lambda>
  20.     seek = property(lambda self: self.file.seek)
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/db/models/fields/files.py" in _get_file
  49.         self._require_file()
File "/home/stefano/projects/blog-project/blogprojectenv/local/lib/python2.7/site-packages/django/db/models/fields/files.py" in _require_file
  46.             raise ValueError("The '%s' attribute has no file associated with it." % self.field.name)

Exception Type: ValueError at /admin/custom_user/customuser/1/
Exception Value: The 'avatar' attribute has no file associated with it.
4

2 回答 2

1

我认为self.avatar在打开头像图像之前询问是否可以工作的条件是因为如果没有头像就没有理由删除它，从我的角度来看。像这样的东西：

def save(self, *args, **kwargs):
    if self.avatar:
        pil_image_obj = Image.open(self.avatar)
        new_image = resizeimage.resize_width(pil_image_obj, 300)

        new_image_io = BytesIO()
        new_image.save(new_image_io, format='JPEG')

        temp_name = self.avatar.name
        self.avatar.delete(save=False)

        self.avatar.save(
            temp_name,
            content=ContentFile(new_image_io.getvalue()),
            save=False
        )

    super(CustomUser, self).save(*args, **kwargs)

我希望这可以帮助您找到解决方案。谢谢 ：）

于 2016-03-24T14:31:18.240 回答
0

创建实例时，磁盘上没有存储头像文件。所以你尝试打开不存在的文件。

我看到你想在这里删除更新后的旧文件？

所以你不需要重写save方法。你应该做的是使用pre_save,post_save和post_delete方法。

在pre_save您存储当前头像时，在更新后post_save您应该使用旧实例检查新实例的文件路径。如果它不同，则将其删除os.remove

post_delete只需删除文件。

信号

于 2016-03-24T14:36:14.820 回答