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Collations and Case Sensitivity Causes Error "nondeterministic collations are not supported for LIKE"

See original GitHub issue

Following the section under Database Collation in the following document:

http://www.npgsql.org/efcore/misc/collations-and-case-sensitivity.html?tabs=data-annotations

When EF Core attempts to locate data using LIKE, it produces the error “nondeterministic collations are not supported for LIKE”.

The version of PostgreSql is PostgreSQL 13.1 (Debian 13.1-1.pgdg100+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
The version of EF Core is 5

The code is:

protected override void OnModelCreating(ModelBuilder builder)
{
  builder.HasCollation("case_insensitive_collation", locale: "en-u-ks-primary", provider: "icu", deterministic: false);
  builder.UseDefaultColumnCollation("case_insensitive_collation");
}

When I view the code for LIKE, I can see where the error message is being produced and I am wondering is the documentation wrong and this is unsupported? Or, have I done something incorrectly? Or, is there something else that needs to be configured?

Issue Analytics

State:
Created 3 years ago
Comments:8 (4 by maintainers)

Top GitHub Comments

1reaction

CorporateActionMancommented, Apr 17, 2023

Hi @roji

it would be great if you could get someone try and implement it to see if it is a useful tool for npgsql developers. Bradley and I would be happy to consult in getting them up and running quickly as the first setup can be finickety because of its flexibility.

All the best!

1reaction

YohDeadfallcommented, Jan 24, 2021

@rabidkitten, we are not responsible for PostgreSQL which limitation you faced. At some point they maybe support that and will mention it their own release notes and docs. Therefore, I see no reason why we should just repeat it and take additional burden by maintaining it too in additional to personal documentation, it would be too much for a free open source project maintained by a few people (EF part is utterly maintained by @roji only). We spend our spare time on it which is limited, so please value what you already have. If you thing there’s something to improve then just go on and open a PR instead of complaining how much time you spent.

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