我的html页面中有一个表单,提示用户将文件或图像上传到服务器。我希望能够上传以太网文件或图像。让我们说如果用户选择文件,图像应该为空,反之亦然。现在我只能上传它们,没有错误。但如果我选择仅上传其中一个(让我们说我选择图片),我会收到错误:
"Key 'attachment' not found in <MultiValueDict: {u'image': [<InMemoryUploadedFile: police.jpg (image/jpeg)>]}>"
#Description of the file
class FileDescription(models.Model):
TYPE_CHOICES = (
('homework', 'Homework'),
('class', 'Class Papers'),
('random', 'Random Papers')
)
subject = models.ForeignKey('Subjects', null=True, blank=True)
subject_name = models.CharField(max_length=100, unique=False)
category = models.CharField(max_length=100, unique=False, blank=True, null=True)
file_type = models.CharField(max_length=100, choices=TYPE_CHOICES, unique=False)
file_uploaded_by = models.CharField(max_length=100, unique=False)
file_name = models.CharField(max_length=100, unique=False)
file_description = models.TextField(unique=False, blank=True, null=True)
file_creation_time = models.DateTimeField(editable=False)
file_modified_time = models.DateTimeField()
attachment = models.FileField(upload_to='files', blank=True, null=True, max_length=255)
image = models.ImageField(upload_to='files', blank=True, null=True, max_length=255)
def __unicode__(self):
return u'%s' % (self.file_name)
def get_fields(self):
return [(field, field.value_to_string(self)) for field in FileDescription._meta.fields]
def filename(self):
return os.path.basename(self.image.name)
def category_update(self):
category = self.file_name
return category
def save(self, *args, **kwargs):
if self.category is None:
self.category = FileDescription.category_update(self)
for field in self._meta.fields:
if field.name == 'image' or field.name == 'attachment':
field.upload_to = 'files/%s/%s/' % (self.file_uploaded_by, self.file_type)
if not self.id:
self.file_creation_time = datetime.now()
self.file_modified_time = datetime.now()
super(FileDescription, self).save(*args, **kwargs)
class ContentForm(forms.ModelForm):
file_name =forms.CharField(max_length=255, widget=forms.TextInput(attrs={'size':20}))
file_description = forms.CharField(widget=forms.Textarea(attrs={'rows':4, 'cols':25}))
class Meta:
model = FileDescription
exclude = ('subject',
'subject_name',
'file_uploaded_by',
'file_creation_time',
'file_modified_time',
'vote')
def clean_file_name(self):
name = self.cleaned_data['file_name']
# check the length of the file name
if len(name) < 2:
raise forms.ValidationError('File name is too short')
# check if file with same name is already exists
if FileDescription.objects.filter(file_name = name).exists():
raise forms.ValidationError('File with this name already exists')
else:
return name
if request.method == "POST":
if "upload-b" in request.POST:
form = ContentForm(request.POST, request.FILES, instance=subject_id)
if form.is_valid(): # need to add some clean functions
# handle_uploaded_file(request.FILES['attachment'],
# request.user.username,
# request.POST['file_type'])
form.save()
up_f = FileDescription.objects.get_or_create(
subject=subject_id,
subject_name=subject_name,
category = request.POST['category'],
file_type=request.POST['file_type'],
file_uploaded_by = username,
file_name=form.cleaned_data['file_name'],
file_description=request.POST['file_description'],
image = request.FILES['image'],
attachment = request.FILES['attachment'],
)
return HttpResponseRedirect(".")
答案 0 :(得分:2)
假设用户选择文件,图像应该为空,反之亦然。
你可以:
制作SQL约束,
如果文件或图片为空,则覆盖model.save()
失败,
定义ContentForm.clean()
如果文件或图片为空,则引发ValidationError
,请参阅Cleaning and validating fields that depend on each other。
另外要注意up_f将是一个元组:
up_f = FileDescription.objects.get_or_create(
答案 1 :(得分:0)
我遇到了同样的问题。由于某种原因,键值dict只需要一个键值对。像这样保存附件
附件= form.data [ '附着']
而不是
附件= request.FILES [ '附着']
它应该运行,但好奇它是否会保存为文件 我知道这个问题已经过时但是在同样的问题上遇到了困难
答案 2 :(得分:0)
创建单选按钮,供用户选择他/她想要上传的内容,并在模型中仅使用一个FileField属性。您可以将其他字段转换为BooleanField或CharField以指示用户选择的内容。