fix structure product categories table and crud product

app/Models/ProductCategory.php

@@ -10,9 +10,17 @@ class ProductCategory extends Model
 {
     use HasFactory, SoftDeletes;
 
-    protected $fillable = ['name'];
+    protected $fillable = ['name','parent_id'];
 
     public function products(){
         return $this->hasMany(Product::class, 'product_category_id');
     }
+
+    public function parent(){
+        return $this->belongsTo(ProductCategory::class, 'parent_id');
+    }
+
+    public function children(){
+        return $this->hasMany(ProductCategory::class,'parent_id');
+    }
 }

app/Models/Stock.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Stock extends Model
+{
+    use HasFactory;
+    protected $table = 'stock';
+    protected $fillable = [
+        'product_id',
+        'dealer_id',
+        'quantity',
+    ];
+
+    public function product()
+    {
+        return $this->belongsTo(Product::class);
+    }
+
+    public function dealer()
+    {
+        return $this->belongsTo(Dealer::class);
+    }
+}