我正在尝试在管理面板中为imageField进行自定义验证，但是我收到以下错误。在事件模型类中有一个名为banner_image的nog字段，但当我将field =（＆＃39; banner_image＆＃39;，）更改为其他内容时，我得到的是＃34;为事件＆＃34;为EventBanner指定。我发现用于进行自定义验证的大多数解决方案都适用于旧版本的Django。
django.core.exceptions.FieldError: Unknown field(s) (banner_image) specified for Event. Check fields/fieldsets/exclude attributes of class EventAdmin.
app admin.py：
class BannerImageForm(forms.ModelForm):
class Meta:
model = EventBanner
fields = ['banner_image',]
def clean_banner_image(self):
banner_image = self.cleaned_data['banner_image']
if not banner_image:
raise forms.ValidationError("No image!")
else:
w, h = get_image_dimensions(banner_image)
if w != 1200:
raise forms.ValidationError("The image is %i pixel wide. It's supposed to be 1200px" % w)
if h != 200:
raise forms.ValidationError("The image is %i pixel high. It's supposed to be 200px" % h)
return banner_image
class EventAdmin(admin.ModelAdmin):
form = BannerImageForm
list_display = ('event_name', 'event_start_date')
formfield_overrides={
models.TextField:{'widget':Textarea(attrs={'rows':15, 'cols':80})}
}
admin.site.register(Event, EventAdmin)
app models.py:
class EventBanner(models.Model):
event = models.OneToOneField(Event, unique=True)
banner_image = models.ImageField(upload_to=get_image_path, blank=True, null=True)
def clean(self):
validate_only_one_instance(self)
回溯：
Environment:
Request Method: GET
Request URL: http://localhost:8000/admin/events/event/1/change/
Django Version: 1.10.4
Python Version: 3.5.2
Installed Applications:
['django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'organizations.apps.OrganizationsConfig',
'news.apps.NewsConfig',
'events.apps.EventsConfig',
'bootstrap3',
'django_forms_bootstrap',
'registration']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
'django.contrib.auth.middleware.SessionAuthenticationMiddleware']
Traceback:
File "/home/dave/Projecten/Web/Django/venv/lib/python3.5/site-packages/django/contrib/admin/options.py" in get_form
642. return modelform_factory(self.model, **defaults)
File "/home/dave/Projecten/Web/Django/venv/lib/python3.5/site-packages/django/forms/models.py" in modelform_factory
548. return type(form)(class_name, (form,), form_class_attrs)
File "/home/dave/Projecten/Web/Django/venv/lib/python3.5/site-packages/django/forms/models.py" in __new__
257. raise FieldError(message)
During handling of the above exception (Unknown field(s) (banner_image) specified for Event), another exception occurred:
File "/home/dave/Projecten/Web/Django/venv/lib/python3.5/site-packages/django/core/handlers/exception.py" in inner
39. response = get_response(request)
File "/home/dave/Projecten/Web/Django/venv/lib/python3.5/site-packages/django/core/handlers/base.py" in _get_response
187. response = self.process_exception_by_middleware(e, request)
File "/home/dave/Projecten/Web/Django/venv/lib/python3.5/site-packages/django/core/handlers/base.py" in _get_response
185. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/dave/Projecten/Web/Django/venv/lib/python3.5/site-packages/django/contrib/admin/options.py" in wrapper
544. return self.admin_site.admin_view(view)(*args, **kwargs)
File "/home/dave/Projecten/Web/Django/venv/lib/python3.5/site-packages/django/utils/decorators.py" in _wrapped_view
149. response = view_func(request, *args, **kwargs)
File "/home/dave/Projecten/Web/Django/venv/lib/python3.5/site-packages/django/views/decorators/cache.py" in _wrapped_view_func
57. response = view_func(request, *args, **kwargs)
File "/home/dave/Projecten/Web/Django/venv/lib/python3.5/site-packages/django/contrib/admin/sites.py" in inner
211. return view(request, *args, **kwargs)
File "/home/dave/Projecten/Web/Django/venv/lib/python3.5/site-packages/django/contrib/admin/options.py" in change_view
1512. return self.changeform_view(request, object_id, form_url, extra_context)
File "/home/dave/Projecten/Web/Django/venv/lib/python3.5/site-packages/django/utils/decorators.py" in _wrapper
67. return bound_func(*args, **kwargs)
File "/home/dave/Projecten/Web/Django/venv/lib/python3.5/site-packages/django/utils/decorators.py" in _wrapped_view
149. response = view_func(request, *args, **kwargs)
File "/home/dave/Projecten/Web/Django/venv/lib/python3.5/site-packages/django/utils/decorators.py" in bound_func
63. return func.__get__(self, type(self))(*args2, **kwargs2)
File "/usr/lib/python3.5/contextlib.py" in inner
30. return func(*args, **kwds)
File "/home/dave/Projecten/Web/Django/venv/lib/python3.5/site-packages/django/contrib/admin/options.py" in changeform_view
1438. ModelForm = self.get_form(request, obj)
File "/home/dave/Projecten/Web/Django/venv/lib/python3.5/site-packages/django/contrib/admin/options.py" in get_form
608. fields = flatten_fieldsets(self.get_fieldsets(request, obj))
File "/home/dave/Projecten/Web/Django/venv/lib/python3.5/site-packages/django/contrib/admin/options.py" in get_fieldsets
298. return [(None, {'fields': self.get_fields(request, obj)})]
File "/home/dave/Projecten/Web/Django/venv/lib/python3.5/site-packages/django/contrib/admin/options.py" in get_fields
597. form = self.get_form(request, obj, fields=None)
File "/home/dave/Projecten/Web/Django/venv/lib/python3.5/site-packages/django/contrib/admin/options.py" in get_form
646. % (e, self.__class__.__name__)
Exception Type: FieldError at /admin/events/event/1/change/
Exception Value: Unknown field(s) (banner_image) specified for Event. Check fields/fieldsets/exclude attributes of class EventAdmin.
答案 0 :(得分：1)
EventAdmin的表单必须使用Event模型。您收到错误是因为BannerImageForm表单使用EventBanner模型。
创建一个EventBannerAdmin，然后让您的代码使用它。然后，您可以将其更改为inline，并在EventAdmin中加入内联。