I wrote a custom validator, which will raise ValidationError if given field value is negative.
def validate_positive(value):
if value < 0:
raise ValidationError(
_('%(value) is negative number'),
params = {'value': value}
)
i added this to my model field via the field’s validators argument
class Book(models.Model):
user = models.ForeignKey(User,on_delete=models.CASCADE)
title = models.CharField(max_length=50)
price = models.IntegerField(default=0,validators=[validate_positive])
quantity = models.IntegerField(default=0,validators=[validate_positive])
But while creating object it's not raising any error if price is less than zero.
I don't know where i am doing wrong and i am new to django.
I am using Django 1.9.
Please help me .
Validators are used for forms, not for creating an object. If you're creating an object outside of a form then you need to provide an alternative way to validate input.
The easiest way to do this is to call the model's full_clean method before saving as shown in the docs
from django.core.exceptions import ValidationError
try:
article.full_clean()
except ValidationError as e:
# Do something based on the errors contained in e.message_dict.
# Display them to a user, or handle them programmatically.
pass
This is similar to what would happen from a form, and would call any validators on your model fields.
Collected from the Internet
Please contact [email protected] to delete if infringement.
Comments