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- 5342. class UserForm(forms.Form):

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<blockquote><code><a href="http://s-c.me/5343/s">Copy&nbsp;Source</a>&nbsp;|&nbsp;<a href="http://s-c.me/5343/h">Copy&nbsp;HTML</a><ol><li>class UserForm(forms.Form):</li>
<li>&nbsp;&nbsp;&nbsp;&nbsp;username = forms.CharField()</li>
<li>&nbsp;</li>
<li>&nbsp;&nbsp;&nbsp;&nbsp;def clean_username(self):</li>
<li>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;data = self.cleaned_data</li>
<li>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;try:</li>
<li>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;User.objects.get(username = data['username'])</li>
<li>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;except User.DoesNotExist:</li>
<li>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return data['username']</li>
<li>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;raise forms.ValidationError('This&nbsp;username&nbsp;is&nbsp;already&nbsp;taken.') </li>
</ol></code></blockquote>

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Copy Source | Copy HTMLclass UserForm(forms.Form): username = forms.CharField() def clean_username(self): data = self.cleaned_data try: User.objects.get(username = data['username']) except User.DoesNotExist: return data['username'] raise forms.ValidationError('This username is already taken.')

Source Code for Me (s-c.me)

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