update

htdocs/app/BioRack.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App;
+
+use Illuminate\Database\Eloquent\Model;
+
+class BioRack extends Model
+{
+    protected $table = 'bio_racks';
+    protected $guarded = [];
+
+    public function cabinet()
+    {
+        return $this->belongsTo(BioCabinet::class, 'cabinet_id');
+    }
+
+    public function specimens()
+    {
+        return $this->hasMany(BioSpecimen::class, 'rack_id');
+    }
+}