make case-insensitive tags with django-taggit

Question

I added tags = TaggableManager(blank=True) to my models, but I want my tags to be case-insensitive. I saw some snippets of work arounds for this and wanted to ask if there is an easy way to do it? If I have to override some methods from the TaggableManager, please advise how can I do that?

Thanks in advance, Arshavski Alexander.

Answer 1

I have used this snippet for a similar issue. A copy of the code (reprinted for posterity):

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
# now...
>>> tag = Tag(name='test')
>>> tag.save()
>>> Tag.objects.get(name='TEST')
<Tag: test>

Basically, you override the initial queryset so that all querysets take case insensitivity into account.