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app/Rules/SumEquals100.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Rules;
+use Illuminate\Contracts\Validation\Rule;
+
+class SumEquals100 implements Rule {
+  public function passes($attribute, $value) {
+    $sum = collect($value)->sum('amount_in_percent');
+    return $sum == 100;
+  }
+
+  public function message() {
+    return 'Die Summe aller Zutaten muss exakt 100% entsprechen.';
+  }
+}