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POWhy does Django throw a KeyError on this form validation?
 

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  1. POWhy does Django throw a KeyError on this form validation?
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    <p>Here's the code: </p> <pre><code>... class Meta: model = Card def clean_video_url(self): video_url = self.cleaned_data['video_url'] if video_url != '' and len(video_url) != YOUTUBE_VIDEO_URL_LENGTH: pos = string.find(video_url, YOUTUBE_VIDEO_URL_IDENTIFIER) identifier_length = len(YOUTUBE_VIDEO_URL_IDENTIFIER) if pos == -1: raise forms.ValidationError(_('youtube-url-not-valid')) video_url = video_url[pos+identifier_length:pos+identifier_length+YOUTUBE_VIDEO_URL_LENGTH] return video_url ... def clean(self): video_url = self.cleaned_data['video_url'] field1 = self.cleaned_data['field1'] if video_url == '' and field1 == '': raise forms.ValidationError(_('must-fill-video-url-or-front')) return self.cleaned_data </code></pre> <p>The most disturbing thing is that it works (submits and persists in the database) in almost all situations. It doesn't work when I write dummy text like 'aeuchah' in the <strong>video_url field</strong>, but instead it throws:</p> <pre><code>Exception Type: KeyError Exception Value: 'video_url' </code></pre> <p>I re-read my clean_video_url method and went to see what the variables were with a debug tool like pdb.set_trace, but I can't find the problem. </p> <p><strong>UPDATE</strong>: <strong>As Marius Grigaitis and Davide R. said, the clean method is called after all the individual field methods are done. clean_video_url raised a ValidationError and returned nothing, so the clean method found nothing to work with and raised a KeyError.</strong></p>
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    1. USuser1011444
    1. USuser1011444
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    1. COCan you show the full traceback?
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    2. COI answered to this exact same question earlier today: http://stackoverflow.com/questions/15382914/
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      1. USDavide R.
    3. COYou were right, that was indeed the problem. I understand how form validation works better now. Thanks.
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