From 967bb2bcbd9c922e74f5408e1f0e4ccbf559be15 Mon Sep 17 00:00:00 2001
From: Kiara Grouwstra <kiara@procolix.eu>
Date: Sun, 17 Aug 2025 13:21:37 +0200
Subject: [PATCH] properly use modular function application to ensure parameter
 type-checks

---
 deployment/data-model-test.nix | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/deployment/data-model-test.nix b/deployment/data-model-test.nix
index 1978be34..9316c55c 100644
--- a/deployment/data-model-test.nix
+++ b/deployment/data-model-test.nix
@@ -98,20 +98,27 @@ in
                     {
                       options.enable = lib.mkEnableOption "Hello in the shell";
                     };
-                  implementation = cfg: {
-                    input = cfg;
-                    output = lib.optionalAttrs cfg.enable {
-                      resources.hello.login-shell.packages.hello = pkgs.hello;
-                    };
+                  implementation = input: fn: {
+                    inherit input;
+                    output =
+                      let
+                        cfg = fn.config.input;
+                      in
+                      lib.optionalAttrs cfg.enable {
+                        resources.hello.login-shell.packages.hello = pkgs.hello;
+                      };
                   };
                 };
               environments.single-nixos-vm =
                 { config, ... }:
                 {
                   resources.operator-environment.login-shell.username = "operator";
-                  implementation = requests: {
-                    input = requests;
+                  implementation = input: fn: {
+                    inherit input;
                     output =
+                      let
+                        requests = fn.config.input;
+                      in
                       { providers, ... }:
                       {
                         providers = {