app/Models/Plant.php

@@ -117,4 +117,9 @@ class Plant extends Model
     {
         return $this->hasMany(CharacteristicValue::class, 'plant_id', 'id');
     }
+
+    public function machines()
+    {
+        return $this->hasMany(Machine::class, 'plant_id', 'id');
+    }
 }