app/Models/Item.php

@@ -3,15 +3,15 @@
 namespace App\Models;
 
 use Illuminate\Database\Eloquent\Model;
-use Illuminate\Database\Eloquent\SoftDeletes;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\SoftDeletes;
 
 class Item extends Model
 {
     use SoftDeletes;
 
     protected $fillable = [
-        "plant_id",
+        'plant_id',
         'category',
         'code',
         'description',
@@ -43,4 +43,9 @@ class Item extends Model
     {
         return $this->hasMany(TestingPanelReading::class);
     }
+
+    public function itemCharacteristics()
+    {
+        return $this->hasMany(ItemCharacteristic::class, 'item_id', 'id');
+    }
 }

app/Models/Plant.php

@@ -102,4 +102,9 @@ class Plant extends Model
     {
         return $this->hasMany(User::class, 'plant_id', 'id');
     }
+
+    public function itemCharacteristics()
+    {
+        return $this->hasMany(ItemCharacteristic::class, 'plant_id', 'id');
+    }
 }