CODEWITHSUNDEEP
djangovalidationdjango-models
guettli
guettli

Reputation: 27139

Django: Validation at model (not forms) level?

I want this to fail:

MyModelWithSlug.objects.create(name='Foo', slug='abc . ü')

The string abc . ü is not a valid slug in django.

How to make above line fail?

Upvotes: 2

Views: 4148

Answers (1)

SomeTypeFoo
SomeTypeFoo

Reputation: 905

Read Alasdair's comment on OP

Django provides a hook called CLEAN to add custom validation but beware Django doesn't call it automatically on either save or create. So you have to override save() on model as well.(Thanks to @alasdair for correcting me.)

So the model becomes:

class MyModelWithSlug(models.Model):
    name = models.CharField(max_length=200, default="")
    slug = models.CharField(max_length=200, null=True, blank=True)

    def clean(self):
        # will raise an Validation Error even if unicode is present. refer validate_unicode_slug
        self.slug = validators.validate_slug(self.slug)

    def save(self):
        self.full_clean() # calls self.clean() as well cleans other fields
         return super(MyModelWithSlug, self).save(*args, **kwargs)

Or Even better:

class MyModelWithSlug(models.Model):
    name = models.CharField(max_length=200, default="")
    slug = models.SlugField(max_length=200, null=True, blank=True)

VALIDATE SLUG LINK

SLUG FIELD LINK

Upvotes: 4

Related Questions