From a3863b1c9c685ecaeb7a1d4fdfa443b9a119caed Mon Sep 17 00:00:00 2001
From: Marius Peter <dev@marius-peter.com>
Date: Sat, 13 Dec 2025 22:32:11 +0100
Subject: Add get-sorted-nutrient-values helper.

---
 models/nutrient-value.rkt | 6 ++++++
 views.rkt                 | 5 ++---
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/models/nutrient-value.rkt b/models/nutrient-value.rkt
index 08bcfad..9653c7f 100644
--- a/models/nutrient-value.rkt
+++ b/models/nutrient-value.rkt
@@ -5,12 +5,15 @@
          nutrient-value-hash/c
          (contract-out [insert-nutrient-values
                         (-> connection? db-id? nutrient-value-hash/c (listof (cons/c symbol? any/c)))]
+                       [get-sorted-nutrient-values
+                        (-> nutrient-value-hash/c (listof (cons/c nutrient? nutrient-value?)))]
                        [update-nutrient-values! (-> connection? db-id? nutrient-value-hash/c void?)]
                        [residuals->nutrient-value-hash
                         (-> (listof residual-vector/c) nutrient-value-hash/c)]))
 
 (require db
          sql
+         racket/hash
          "nutrient.rkt"
          "utils.rkt")
 
@@ -34,6 +37,9 @@
                    #:from (TableExpr:AST ,(make-values*-table-expr-ast nv-rows)))))
   (simple-result-info result))
 
+(define (get-sorted-nutrient-values nv)
+  (sort (hash->list (hash-filter-values nv positive?)) > #:key cdr))
+
 (define (update-nutrient-values! conn nvs-id nutrient-values)
   (for ([(n v) (in-hash nutrient-values)])
     (query-exec conn
diff --git a/views.rkt b/views.rkt
index 805dc58..3544474 100644
--- a/views.rkt
+++ b/views.rkt
@@ -17,10 +17,10 @@
 
 (require gregor
          web-server/formlets
-         racket/hash
          "formlets.rkt"
          "models/user.rkt"
          "models/nutrient.rkt"
+         "models/nutrient-value.rkt"
          "models/nutrient-measurement.rkt"
          "models/crop.rkt"
          "models/crop-rotation.rkt"
@@ -257,8 +257,7 @@
 (define (show-fertilizer-page fp)
   (define product-name (fertilizer-product-name fp))
   (define brand-name (fertilizer-brand-name fp))
-  (define positive-nutrient-values (hash-filter-values (fertilizer-product-values fp) positive?))
-  (define sorted-nutrient-values (sort (hash->list positive-nutrient-values) > #:key cdr))
+  (define sorted-nutrient-values (get-sorted-nutrient-values (fertilizer-product-values fp)))
   (define table
     `(table ((class "table"))
             (thead (tr (th "Nutriment") (th ((class "text-end")) "Concentration (mg/L)")))
-- 
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