Django 4.1 - CharField that doesn't require max_length (for databases like PostgreSQL)

postgresql_charfield.py

from django.db import models


class CharField(models.CharField):
    """A subclass of django.db.models.CharField that doesn't require max_length."""

    def _check_max_length_attribute(self, **kwargs):
        """Allow max_length=None (the default value) without errors."""
        if self.max_length is None:
            return []
        return super()._check_max_length_attribute(**kwargs)

    def db_type(self, connection):
        """Removes (%(max_length)s) from generated db_type."""
        result = super().db_type(connection)
        if self.max_length is None:
            result = result.split('(')[0]
        return result