Dsl on Home https://blog.rafaelfernandez.dev/tags/dsl/ Recent content in Dsl on Home Hugo -- gohugo.io en © 2026 Rafael Fernandez Wed, 01 Apr 2026 00:00:00 +0000 criteria4s 4. Your domain has no database https://blog.rafaelfernandez.dev/posts/criteria4s-4-your-domain-has-no-database/ Wed, 01 Apr 2026 00:00:00 +0000 https://blog.rafaelfernandez.dev/posts/criteria4s-4-your-domain-has-no-database/ How to use T <: CriteriaTag as a hexagonal port so your domain layer never imports a dialect. The database becomes a deployment decision. criteria4s. Your domain has no database https://blog.rafaelfernandez.dev/posts/criteria4s-4-your-domain-has-no-database/ Wed, 01 Apr 2026 00:00:00 +0000 https://blog.rafaelfernandez.dev/posts/criteria4s-4-your-domain-has-no-database/ How to use T <: CriteriaTag as a hexagonal port so your domain layer never imports a dialect. The database becomes a deployment decision. criteria4s 3. Do you speak my language? https://blog.rafaelfernandez.dev/posts/criteria4s-3-teach-criteria4s-a-new-language/ Mon, 30 Mar 2026 00:00:00 +0000 https://blog.rafaelfernandez.dev/posts/criteria4s-3-teach-criteria4s-a-new-language/ How to teach criteria4s a backend it has never heard of. Build a dialect from scratch in thirty lines, or inherit one in five. criteria4s. Do you speak my language? https://blog.rafaelfernandez.dev/posts/criteria4s-3-teach-criteria4s-a-new-language/ Mon, 30 Mar 2026 00:00:00 +0000 https://blog.rafaelfernandez.dev/posts/criteria4s-3-teach-criteria4s-a-new-language/ How to teach criteria4s a backend it has never heard of. Build a dialect from scratch in thirty lines, or inherit one in five. criteria4s 1. The filter you were always going to rewrite https://blog.rafaelfernandez.dev/posts/criteria4s-1-write-your-filters-once-run-them-everywhere/ Thu, 26 Mar 2026 00:00:00 +0000 https://blog.rafaelfernandez.dev/posts/criteria4s-1-write-your-filters-once-run-them-everywhere/ Write a predicate once and run it against SQL, MongoDB, Elasticsearch, or any backend. An introduction to criteria4s and its practical take on the Expression Problem. criteria4s. The filter you were always going to rewrite https://blog.rafaelfernandez.dev/posts/criteria4s-1-write-your-filters-once-run-them-everywhere/ Thu, 26 Mar 2026 00:00:00 +0000 https://blog.rafaelfernandez.dev/posts/criteria4s-1-write-your-filters-once-run-them-everywhere/ Write a predicate once and run it against SQL, MongoDB, Elasticsearch, or any backend. An introduction to criteria4s and its practical take on the Expression Problem.