Custom Validation with clean methods
Add field- and form-level validation rules.
Beyond Built-in Rules
Model fields give you basic checks, but real apps need custom rules. Django runs your own clean methods to enforce exactly the logic you want. 🧹
Field-Level clean
To validate one field, add a method named clean_fieldname. Django calls it automatically during validation for that single field.
def clean_title(self):
title = self.cleaned_data["title"]
return titleAll lessons in this course
- Declaring a ModelForm and Meta.fields
- form.save() and commit=False
- Custom Validation with clean methods
- Widgets, Labels, and Help Text