I have a model called Document that has a FileField for uploading files.
class Document(models.Model):
document_id = models.AutoField(primary_key=True)
title = models.CharField('title', max_length=200)
description = models.TextField('description')
storage_file_name = models.FileField('File name',
upload_to=unique_file_path)
computed_sha256 = models.CharField(editable=False, max_length=64)
.....
I am trying to validate the storage_file_name field in the Admin form. The
validation logic is as follows:
If there is another Document with the same computed_sha256, and this is a
new Document, then raise a ValidationError.
The tricky part is the "and this is a new Document".
In the admin.py, I have a ModelForm called DocumentForm.
class DocumentForm(forms.ModelForm):
class Meta:
model = Document
fields = "__all__"
def clean_storage_file_name(self):
cleaned_data = self.cleaned_data
computed_sha256 =
compute_sha256(cleaned_data.get("storage_file_name"))
duplicates =
Document.objects.filter(computed_sha256__exact=computed_sha256)
current_doc_id = cleaned_data.get('document_id')
for d in duplicates:
if (existing_doc_id != d.document_id):
raise forms.ValidationError("The image '%s' is already in
the database" % (cleaned_data.get("storage_file_name")))
return self.cleaned_data['storage_file_name']
The current_doc_id is always None, whether I am uploading a new file or I
am editing a current file already in the database. I can read all the other
document fields, but not the document_id field. If I am updating an
existing document, then the current_document_id should exist and be equal
to the d.document_id (the id of the document found in the search).
I can't figure out why the current_document_id is always None. What am I
missing here?
How else can I block the ValidationError when I am merely updating another
Document field, because that also returns a duplicate image based on the
computed_sha256.
Thanks!
Mark
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