I've created a dynamic form to allow users to upload images, and I'm
trying to validate the form. - it displays fine, but when I validate
and return a response, I get either a Key Error at the line (data =
self.cleaned_data[dataName] ) in _clean_photo or I get a render error
in my template at {{ image_form.as_table }} - I'm not too sure why
sometimes I get either of the errors.
In my view that gets posted to, i have:
#images_submitted is a list of the names of the submitted image
fields
listingImages = make_image_form(images_submitted)
image_form = listingImages(request.POST, request.FILES)
The code calls into the make_image_form view to create the form:
def _clean_photo(self, dataName):
data = self.cleaned_data[dataName]
if data != None:
if data.size > max_photo_size:
raise forms.ValidationError("The maximum image size
allowed is 500KB")
elif data.size == 0:
raise forms.ValidationError("The image given is
empty.")
return data
def make_image_form(image_fields):
''' Takes a list of image_fields to generate image fields '''
images = SortedDict() #a django sortedDict
#create the ImageFields for the form
for image_name in image_fields:
images[image_name] = forms.ImageField(required=False)
new_form = type('ListingImagesForm2', (forms.BaseForm,),
{'base_fields' : images})
#now we add the validation methods to the class
for image_name in image_fields:
setattr(new_form, 'clean_' + image_name, lambda self:
self._clean_photo(image_name))
#Add the _clean_photo method to the class
setattr(new_form, '_clean_photo', _clean_photo)
return new_form
The _clean_photo method only gets called once - for the first photo.
The ListingImagesForm2 class gets created fine, and the clean_photo_1,
2, 3 methods get created fine as well.
I'm not too sure what's happening with the errors, but I think that it
must have something to do with how I'm validating. When _clean_photo
was called, self.cleaned_data had the image info for the first image
only, when 2 or 3 images were posted.
I hope I've provided enough information for help, any ideas as to what
might be wrong will be highly appreciated :)
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