How can I implement custom validation in Django formsets?

How can I implement custom validation in Django formsets?

You can implement custom validation in Django formsets by overriding the clean method of the formset class.

Can you show me an example of how to do that?

Sure! Here's a simple example:

from django import forms
from django.forms import formset_factory

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

class MyFormSet(forms.BaseFormSet):
    def clean(self):
        super().clean()
        names = [form.cleaned_data['name'] for form in self.forms if form.cleaned_data]
        if len(names) != len(set(names)):
            raise forms.ValidationError('Names must be unique.')

MyFormSet = formset_factory(MyForm, formset=MyFormSet)

What if I want to add more complex validation rules?

You can add more complex validation rules by implementing additional checks in the clean method. Just ensure to raise ValidationError for any invalid conditions.