CODE EXAMPLE FOR PYTHON

custom validation in django models

from django.db import models
# importing validationerror
from django.core.exceptions import ValidationError
 
# creating a validator function
def validate_geeks_mail(value):
    if "@gmail.com" in value:
        return value
    else:
        raise ValidationError("This field accepts mail id of google only")
 
 
# Create your models here.
class GeeksModel(models.Model):
    geeks_mail = models.CharField(
                         max_length = 200,
                         validators =[validate_geeks_mail]
                         )