https://glenn-roberts.com/tags/elixir/Recent content in Elixir on Glenn RobertsHugo -- gohugo.ioen© 2026 Glenn Roberts - All rights reserved.Mon, 09 Nov 2026 23:55:26 +1000https://glenn-roberts.com/posts/2026/11/09/render-pdfs-in-elixir-with-the-typst-nif/Mon, 09 Nov 2026 23:55:26 +1000https://glenn-roberts.com/posts/2026/11/09/render-pdfs-in-elixir-with-the-typst-nif/A Phoenix app renders its report PDFs inside the BEAM with the typst package's NIF. Why not headless Chrome or the Typst CLI, the checks a NIF has to pass, and a benchmark against the CLI.https://glenn-roberts.com/posts/2026/11/07/pass-the-time-as-now-not-on-the-phoenix-scope/Sat, 07 Nov 2026 23:54:13 +1000https://glenn-roberts.com/posts/2026/11/07/pass-the-time-as-now-not-on-the-phoenix-scope/https://glenn-roberts.com/posts/2026/11/05/phoenix-filter-parameters-doesnt-redact-tokens-in-the-url-path/Thu, 05 Nov 2026 21:34:51 +1000https://glenn-roberts.com/posts/2026/11/05/phoenix-filter-parameters-doesnt-redact-tokens-in-the-url-path/https://glenn-roberts.com/posts/2026/11/03/make-the-phoenix-scope-the-first-argument/Tue, 03 Nov 2026 21:23:08 +1000https://glenn-roberts.com/posts/2026/11/03/make-the-phoenix-scope-the-first-argument/Pass Phoenix 1.8's Scope first to almost every public context function, and the context becomes one authorization layer for your LiveViews, controllers, APIs and MCP server.https://glenn-roberts.com/posts/2026/10/27/enforce-phoenix-contexts-with-boundary/Tue, 27 Oct 2026 21:22:28 +1000https://glenn-roberts.com/posts/2026/10/27/enforce-phoenix-contexts-with-boundary/Phoenix contexts are a convention until something checks them. boundary makes a call from the web layer into a context's internals fail the build, even on an app that already breaks the rules.https://glenn-roberts.com/posts/2026/10/25/mcp-before-rest-when-the-caller-is-an-agent/Sun, 25 Oct 2026 22:40:01 +1000https://glenn-roberts.com/posts/2026/10/25/mcp-before-rest-when-the-caller-is-an-agent/We wanted AI agents to work with our app. I built an MCP server with OAuth first, and REST only when a script that doesn't speak MCP needed the app too.https://glenn-roberts.com/posts/2026/10/22/mutation-testing-finds-what-coverage-misses/Thu, 22 Oct 2026 23:06:44 +1000https://glenn-roberts.com/posts/2026/10/22/mutation-testing-finds-what-coverage-misses/Line coverage said our Phoenix app was 96% tested. Mutation testing with Muex, run only on a branch's changed lines and fast tests, found 17 changes no test caught.https://glenn-roberts.com/posts/2026/02/26/which-id-belongs-in-the-uri/Thu, 26 Feb 2026 22:07:34 +1000https://glenn-roberts.com/posts/2026/02/26/which-id-belongs-in-the-uri/A record with its own primary key and an id from the upstream system that sent it. The upstream id usually belongs in the URI, when it passes three tests.https://glenn-roberts.com/posts/2026/02/05/409-from-racing-oban-jobs-means-re-fetch/Thu, 05 Feb 2026 22:20:50 +1000https://glenn-roberts.com/posts/2026/02/05/409-from-racing-oban-jobs-means-re-fetch/https://glenn-roberts.com/posts/2025/11/24/where-to-block-promex-metrics/Mon, 24 Nov 2025 20:02:47 +1000https://glenn-roberts.com/posts/2025/11/24/where-to-block-promex-metrics/PromEx's plug serves /metrics on the Phoenix app's public port. Why blocking it at the load balancer beats an ingress-nginx snippet, and when a separate metrics port is simpler.https://glenn-roberts.com/posts/2022/10/25/how-to-test-your-elixir-phoenix-liveview-apps-with-k6/Tue, 25 Oct 2022 23:09:24 +1000https://glenn-roberts.com/posts/2022/10/25/how-to-test-your-elixir-phoenix-liveview-apps-with-k6/How to test your Elixir Phoenix LiveView apps with k6.https://glenn-roberts.com/posts/2020/09/27/circle-shift-an-array-in-elixir/Sun, 27 Sep 2020 00:00:00 +0000https://glenn-roberts.com/posts/2020/09/27/circle-shift-an-array-in-elixir/Circle Shift an Array in Elixir