How can I validate Django model forms effectively?

How can I validate Django model forms effectively?

You can validate Django model forms by using built-in validators, custom validation methods, and the clean() method.

Can you give me an example of a custom validation method?

Sure! You can create a custom validation method in your form class like this:

from django import forms

class MyForm(forms.ModelForm):
    class Meta:
        model = MyModel
        fields = ['my_field']

    def clean_my_field(self):
        data = self.cleaned_data['my_field']
        if not data.is_valid():
            raise forms.ValidationError('Invalid data!')
        return data

What are some built-in validators I can use?

Django provides several built-in validators like MaxLengthValidator, MinLengthValidator, EmailValidator, and RegexValidator. You can use them in your model fields.