Unique model field in Django and case sensitivity (postgres)

Question

Consider the following situation: -

Suppose my app allows users to create the states / provinces in their country. Just for clarity, we are considering only ASCII ch

Answer 1

Alternatively you can change the default Query Set Manager to do case insensitive look-ups on the field. In trying to solve a similar problem I came across:

http://djangosnippets.org/snippets/305/

Code pasted here for convenience:

from django.db.models import Manager
from django.db.models.query import QuerySet

class CaseInsensitiveQuerySet(QuerySet):
    def _filter_or_exclude(self, mapper, *args, **kwargs):
        # 'name' is a field in your Model whose lookups you want case-insensitive by default
        if 'name' in kwargs:
            kwargs['name__iexact'] = kwargs['name']
            del kwargs['name']
        return super(CaseInsensitiveQuerySet, self)._filter_or_exclude(mapper, *args, **kwargs)

# custom manager that overrides the initial query set
class TagManager(Manager):
    def get_query_set(self):
        return CaseInsensitiveQuerySet(self.model)

# and the model itself
class Tag(models.Model):
    name = models.CharField(maxlength=50, unique=True, db_index=True)

    objects = TagManager()

    def __str__(self):
        return self.name