python - How to use validation to make a clickable, pseudo-readonly FileField in the admin? -

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i'm trying have filefield clickable in admin readonly. there's open ticket issue, need workaround now. i'm trying write validator admin class i'm running exception when run it. have:

class modelwithattachment(models.model):     attachment = filefield(upload_to=somewhere, blank=true)  class modelwithattachmentadminform(forms.modelform):     class meta:         model = modelwithattachment      def clean_attachment(self):         attachment = self.cleaned_data['attachment']         return self.cleaned_data['attachment']  class modelwithattachmentadmin(admin.modeladmin):     form = modelwithattachmentadminform

currently assertionerror no exception supplied @ line attachment = self.cleaned_data['attachment']. if replace line cleaned_data = self.cleaned_data, same assertionerror. far understand it, self.cleaned_data supposed have been created earlier in validation process, don't understand why doesn't seem exist.

secondly, goal whole scheme check value of attachment being submitted through admin against value holds, , reject (raise validationerror) if 2 differ - making attachment 'readonly' while allowing clicked in admin. feasible goal? there better/simpler way accomplish this?

i figured out. approach correct, clean_attachment being defined as: 

def clean_attachment(self):      if 'attachment' in self.changed_data:          raise forms.validationerror('no!')       return self.cleaned_data['attachment']

the problem old .pyc file getting reused incorrectly. once deleted that, fine. hope helps else out.


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