Using Your Django Model’s max_length in Your ModelForm

Let’s say you have a field defined as the following in your model:

	class User(models.Model):
	first_name = models.CharField(max_length=40, null=True)

view raw

models.py

hosted with ❤ by GitHub

You can then use the max_length in your ModelForm like this:

	class RegisterForm(forms.ModelForm):
	first_name = forms.CharField(max_length=User._meta.get_field('first_name').max_length)

view raw

forms.py

hosted with ❤ by GitHub