Django snippets: Username form field

class UserField(forms.CharField): 
    class widget(forms.widgets.TextInput): 
        def render(self, name, value, attrs=None): 
            if isinstance(value, int): 
                value = unicode(User.objects.get(pk=value)) 
            return super(UserField.widget, self).render(name, value, attrs) 
        
    def clean(self, value): 
        value = super(UserField, self).clean(value) 
        if not value: 
            return None 
        try: 
            return User.objects.get(username=value) 
        except User.DoesNotExist: 
            raise forms.ValidationError(u'invalid user name')

Use a UserField if you want to replace the usual select menu with a simple input field that only accepts valid user names. Should be easy to generalize for other models by passing a query set and the attribute name that represents the instance.

Example:

class Book(models.Model):
    owner = models.ForeignKey(User)

class BookForm(forms.ModelForm):
    owner = UserField()
    class Meta:
        model = Book

Author:: sma
Posted:: November 16, 2008
Language:: Python
Tags:: field form textual user username
Score:: 1 (after 1 rating)

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Username form field

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