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)

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models.py
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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)

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

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