CODEWITHSUNDEEP
pythondjangodjango-modelsdjango-validation
Unos
Unos

Reputation: 1361

Overriding/Disabling the max_length validation of CharField in form.ModelForm

Suppose I have this model defined in models.py:

[ . . . ]
class Robot(models.Model):
    ROBOT_CATEGORIES = (
    [ . . . ]
    )   
    name = models.CharField(max_length=30)
    version = models.ForeignKey('Version')
    category = models.CharField(max_length=10, choices=ROBOT_CATEGORIES)
    comments = models.CharField(max_length=2000, blank=True)

    def __unicode__(self):
        return "ROBOT %s [%s]" % (self.name, self.version)
    class Meta:
        unique_together = ('name', 'version',)

I want to add Admin functionality to this model. User may enter a comma-separated-list of different Robot names, and save_model takes care of saving them as different objects. For this, I want to do all validation myself. So here is the Admin Code:

class RobotForm(forms.ModelForm):
    name = forms.CharField()
    comments = forms.CharField(widget=forms.Textarea, required=False)

    def clean_name(self):
        # custom validation here
        [ . . . ]
        return data

    def clean(self):
        cleaned_data = super(RobotForm, self).clean()
        # custom validation here
        [ . . . ]
        return cleaned_data

    class Meta:
        model = Robot

class RobotAdmin(admin.ModelAdmin):
    form = RobotForm
    list_display = ('name','version','category','comments')

    def save_model(self, request, obj, form, change):
        # custom save method
        obj.save()

admin.site.register(Robot, RobotAdmin);

Everything works fine, except for the max_length limit I set in the model for Robot.name. In the 'Add' form, if the list's length in the 'Name' field exceeds 30 chars, it flashes an error. I validate each individual name's length in the clean_name method, and want to disable the max_length validation in the form field. How do I do this?

Upvotes: 1

Views: 2007

Answers (1)

Kugel
Kugel

Reputation: 19814

In your overridden clean method remove the errors from the cleaned_data like here:

Override data validation on one django form element

Upvotes: 1

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