reconstruction of the project

app/Models/InventoryItem.php

@@ -7,13 +7,10 @@ use App\Models\BaseModel;
 class InventoryItem extends BaseModel
 {
     protected $table = 'inventory_items';
-    protected $primaryKey = 'id';
-    protected $useSoftDeletes = false;
-    public $timestamps = true;
-    const CREATED_AT = 'created_at';
-    const UPDATED_AT = 'updated_at';
 
-    // IMPORTANT: include everything you ever update/insert
+    // ✅ CI: useTimestamps = true
+    public $timestamps = true;
+
     protected $fillable = [
         'type',
         'category_id',
@@ -37,13 +34,20 @@ class InventoryItem extends BaseModel
         'updated_at',
     ];
 
+    protected $casts = [
+        'category_id'        => 'integer',
+        'quantity'           => 'integer',
+        'updated_by'         => 'integer',
 
-    protected $validationRules = [
-        'type'        => 'required|in_list[classroom,book,office,kitchen]',
-        'name'        => 'required|min_length[2]',
-        'quantity'    => 'permit_empty|integer',
-        'unit_price'  => 'permit_empty|decimal',
-        'semester'    => 'permit_empty|in_list[Spring,Fall]',
-        'school_year' => 'permit_empty|max_length[16]', // e.g. 2025-2026
+        'good_qty'           => 'integer',
+        'needs_repair_qty'   => 'integer',
+        'need_replace_qty'   => 'integer',
+        'cannot_find_qty'    => 'integer',
     ];
-}
+
+    /* Optional relationships */
+    public function category()
+    {
+        return $this->belongsTo(InventoryCategory::class, 'category_id');
+    }
+}