Custom validation in Django admin

Question

I have a very simple Django app in order to record the lectures given my colleagues.Since it is quite elementary,I am using the Django admin itself. Here is my models.py:

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Answer 1

You have an indentation issue. Your clean method is indented within the form's Meta class. Move it back one level. Also, ensure that the return statement is indented within the method.

Answer 2

Usually you just want to define a clean() method on the model itself.

https://docs.djangoproject.com/en/2.1/ref/models/instances/#validating-objects

from django.core.exceptions import ValidationError

class Lecture(models.Model):
    topic = models.CharField(max_length=100)
    speaker = models.CharField(max_length=100)
    start_date = models.DateField()
    end_date = models.DateField()

    def clean(self):
        if self.start_date > self.end_date::
            raise ValidationError("Dates are incorrect")

Something like that will work in the django admin without any need to create a form class.

Answer 3

def clean(self): 
   if self.database_name != '111':
      raise ValidationError("You can use only letters ,numbers and 
      underscores.")

This clean method works perfect for me in django admin