Could anyone explain to me similarities and differences of Django’s
Forms created from
forms.Form are manually configured by you. You’re better off using these for forms that do not directly interact with models. For example a contact form, or a newsletter subscription form, where you might not necessarily be interacting with the database.
Where as a form created from
forms.ModelForm will be automatically created and then can later be tweaked by you. The best examples really are from the superb documentation provided on the Django website.
Documentation: Form objects
Example of a normal form created with
from django import forms class ContactForm(forms.Form): subject = forms.CharField(max_length=100) message = forms.CharField() sender = forms.EmailField() cc_myself = forms.BooleanField(required=False)
Documentation: Creating forms from models
Straight from the docs:
If your form is going to be used to
directly add or edit a Django model,
you can use a
duplicating your model description.
Example of a model form created with
from django.forms import ModelForm from . import models # Create the form class. class ArticleForm(ModelForm): class Meta: model = models.Article
This form automatically has all the same field types as the
Article model it was created from.
The similarities are that they both generate sets of form inputs using widgets, and both validate data sent by the browser. The differences are that ModelForm gets its field definition from a specified model class, and also has methods that deal with saving of the underlying model to the database.
Here’s how I’m extending the builtin UserCreationForm myapp/forms.py:
from django import forms from django.contrib.auth.forms import UserCreationForm class RegisterForm(UserCreationForm): first_name = forms.CharField(max_length=30) last_name = forms.CharField(max_length=30) email = forms.CharField(max_length=75) class Meta(UserCreationForm.Meta): fields = ('username','first_name','last_name', 'email')