How can I validate forms in Django?

How can I validate forms in Django?

In Django, you can validate forms using the built-in form validation methods. You define your form fields in a class that inherits from forms.Form or forms.ModelForm.

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

Sure! You can create a custom validation method by defining a method in your form class. For example:

from django import forms

class MyForm(forms.Form):
    name = forms.CharField(max_length=100)

    def clean_name(self):
        name = self.cleaned_data.get('name')
        if 'badword' in name:
            raise forms.ValidationError('Inappropriate word used!')
        return name

What happens if the validation fails?

If validation fails, Django will raise a ValidationError, and the form will not be saved. Instead, it will return the errors to the user, allowing them to correct their input.