> Hi,

> Is it possible to apply validation on particular field within
> models.py?.

> I have the below model defined, the form is dynamically managed by
> Django Admin

> class CategoryMapping(models.Model):
>      categoryid   = models.AutoField(primary_key=True,)
>      categorytype = models.CharField( max_length = 250, unique =
> True,)
>      displayname  = models.CharField( max_length = 250, blank =
> False,)
>      description  = models.TextField( blank = True,)
>      def __str__(self):
>          return self.categorytype
>      class Meta:
>           db_table = 'category_mapping'

> Here I want to apply a validation for the field 'categorytype' in
> models.py itself without calling forms.py

> eg:

>  def clean_categorytype(self):
>        if self.cleaned_data.get('categorytype', 'test'):
>          raise forms.ValidationError(u'Please enter valid category
> type')
>        else:
>          return self.cleaned_data.get('categorytype')

> is it possible?