On 6/08/2023 9:17 pm, Chetan Ganji wrote: Thanks Chetan
I have seen that 'icu' and 'und-whatever...' in various places on the web - so it seems to be spreading - but I haven't had the brainspace to understand it yet.
I'll try an experiment with provider='C' and locale='C' because that is how most of my databases are already established. If that passes my tests I might move on to other things.
From what I can see, PostgreSQL are likely to deprecate citext as inelegant. That would be why Django has deprecated it.
Thanks again. Mike
Check this out. https://gist.github.com/hleroy/2f3c6b00f284180da10ed9d20bf9240a# According to Django documentation, it’s preferable to use non-deterministic collations# instead of the citext extension for Postgres > 12. # Example migation to create the case insensitive collation class Migration(migrations.Migration): operations = [ CreateCollation( 'case_insensitive', provider='icu', locale='und-u-ks-level2', deterministic=False ) ]# Example model using the new db_collation parameter introduced with Django 3.2class Tag(models.Model): name = models.CharField(max_length=50, db_collation='case_insensitive') class Meta: ordering = ['name'] def __str__(self): return self.name Regards, Chetan Ganji +91-900-483-4183 ganji.che...@gmail.com http://ryucoder.inOn Sun, Aug 6, 2023 at 12:32 PM Mike Dewhirst <mi...@dewhirst.com.au> wrote:On 5/08/2023 7:58 pm, Chetan Ganji wrote:Hi Mike RE: The primary use case is to establish case-insensitivity when checking names - including usernames, company names and abbreviations/acronyms. I dont know anything about db_collation.Me neitherBelow 4 lookups should solve most common scenarios.Actually that was how I did it originally. I switched to using the PostgreSQL CI field because it is all done in the database - much faster - and my code is much reduced and therefore fewer possibilities for bugs etc. Judging from the Django release notes and the PostgreSQL docs there should be a straightforward answer to my question. Researching the correct answer is complex enough to make me ask here first. Cheers Mikehttps://docs.djangoproject.com/en/4.2/ref/models/querysets/#field-lookups Regards, Chetan Ganji +91-900-483-4183 ganji.che...@gmail.com http://ryucoder.in On Sat, Aug 5, 2023 at 1:35 PM Mike Dewhirst <mi...@dewhirst.com.au> wrote: The following warning triggered a bit of research which looks like a significant amount of study will be required to find the collation needed ... django.contrib.postgres.fields.CICharField is deprecated. Support for it (except in historical migrations) will be removed in Django 5.1. HINT: Use CharField(db_collation="…") with a case-insensitive non-deterministic collation instead. Does anyone have experience they would like to share? What replaces that ellipsis? The primary use case is to establish case-insensitivity when checking names - including usernames, company names and abbreviations/acronyms. Maybe there is a better way to handle that? This is my typical PostgreSQL database spec ... CREATE DATABASE xxxx WITH OWNER = miked ENCODING = 'UTF8' LC_COLLATE = 'C' LC_CTYPE = 'C' TABLESPACE = pg_default CONNECTION LIMIT = -1 IS_TEMPLATE = False; Many thanks for any help Cheers Mike-- You received this message because you are subscribed to theGoogle Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. 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