Re: custom file validation

Two things going on here:

1) Validation that involves checking multiple fields should be done in
the form's clean() method rather than its clean_FIELDNAME method. Not
all fields are guaranteed to have been added to cleaned_data until you
reach the clean() method.

2) Try using self.cleaned_data.get('canvas_height') and
self.cleaned_data.get('file') instead of directly referencing the
dictionary indices. get() will return None if the key is not found
(or if the value is None), whereas accessing the index will throw a
KeyError if the key is not found -- which you then need to catch if
you don't want to interrupt script execution.

On Sep 3, 10:52 am, deecodameeko <deecodame...@gmail.com> wrote:
> Hi,
>
> I have a file in a form. The file is optional but if the file is not
> None, then some other form fields are required as well.  For example
> the following code checks one of the fields that's required when the
> file fields isn't empty:
>
> file            = forms.FileField(required=False)
>
> def clean_canvas_height(self):
>
>             canvas_height = self.cleaned_data['canvas_height']
>             file = self.cleaned_data['file']
>             if file is not None and canvas_height is None:
>                 raise forms.ValidationError('You must specify a canvas
> height')
>             return canvas_height
>
> this produces a KeyError which I'm gathering I can't access the file
> info this way. My question is how can I go about writting a custom
> validation against a file field.
>
> Cheers!
>
> D

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