To make Django Model Field Case-Insensitive you don’t need to hack the ModelManager, Middleware or View, just follow the simple steps below:

1. Install my package called "Django Case-Insensitive Field" from pypi.org using the command below:

pip install django_case_insensitive_field

1. Extend CaseInsensitiveFieldMixin

I love to organize my code, so I have created a file named fields.py file in my app directory. The content of the file is given below:

from django.db.models import CharField

from django_case_insensitive_field import CaseInsensitiveFieldMixin

class CaseInsensitiveCharField(CaseInsensitiveFieldMixin, CharField):
    """[summary]
    Makes django CharField case insensitive \n
    Extends both the `CaseInsensitiveMixin` and  CharField \n
    Then you can import 
    """

    def __init__(self, *args, **kwargs):

        super(CaseInsensitiveMixin, self).__init__(*args, **kwargs)

1. Use the CaseInsensitiveCharField in your models.py file:

from .fields import CaseInsensitiveCharField

class UserModel(models.Model):
    username = CaseInsensitiveCharField(max_length=16, unique=True)

user1 = UserModel(username='user1')

user1.save()  # will go through

user2 = UserModel(username='User1')

user2.save() # will not go through

That’s all — the simplest way to make Django Model Field case-insensitive. I hope that in the future Django will include this pacakage natively.