Django Django Forms & Validation

Question 1

What class do you subclass to create a Django form?

Accepted Answer

forms.Form

Answer

forms.Form is the base class for creating standard Django forms with manually defined fields, separate from any model.

Question 2

What is a Django ModelForm?

Accepted Answer

A form that automatically generates fields from a Django model

Answer

ModelForm creates form fields based on a model's field definitions, reducing duplication by using the model as the source of truth for field types and validators.

Question 3

Which method checks if a submitted Django form is valid?

Accepted Answer

form.is_valid()

Answer

is_valid() runs all field-level and form-level validation, populates form.cleaned_data if successful, and returns True or False.

Question 4

Where is validated form data stored after calling `form.is_valid()`?

Accepted Answer

form.cleaned_data

Answer

form.cleaned_data is a dictionary populated by is_valid() that contains the validated and type-coerced form field values.

Question 5

How do you define custom validation for a single field in a Django form?

Accepted Answer

Define a method named clean_<fieldname>(self)

Answer

A method named clean_fieldname() is automatically called by is_valid() for that field and can raise ValidationError or return the cleaned value.

Django Practice Test

Django Practice Test

Django Django Forms & Validation