diff --git a/backend/product/migrations/0010_alter_productmodel_related_products.py b/backend/product/migrations/0010_alter_productmodel_related_products.py
new file mode 100644
index 0000000..a5abc36
--- /dev/null
+++ b/backend/product/migrations/0010_alter_productmodel_related_products.py
@@ -0,0 +1,18 @@
+# Generated by Django 5.1.2 on 2025-02-01 18:32
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('product', '0009_productmodel_related_products'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='productmodel',
+            name='related_products',
+            field=models.ManyToManyField(blank=True, null=True, to='product.productmodel'),
+        ),
+    ]
diff --git a/backend/product/migrations/0011_alter_productmodel_category_and_more.py b/backend/product/migrations/0011_alter_productmodel_category_and_more.py
new file mode 100644
index 0000000..af64444
--- /dev/null
+++ b/backend/product/migrations/0011_alter_productmodel_category_and_more.py
@@ -0,0 +1,24 @@
+# Generated by Django 5.1.2 on 2025-02-01 23:47
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('product', '0010_alter_productmodel_related_products'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='productmodel',
+            name='category',
+            field=models.ForeignKey(null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='products', to='product.subcategorymodel', verbose_name='دسته بندی محصول'),
+        ),
+        migrations.AlterField(
+            model_name='productmodel',
+            name='related_products',
+            field=models.ManyToManyField(blank=True, to='product.productmodel'),
+        ),
+    ]
diff --git a/backend/product/models.py b/backend/product/models.py
index 5d62e7c..7381f6e 100644
--- a/backend/product/models.py
+++ b/backend/product/models.py
@@ -110,8 +110,8 @@ class ProductModel(models.Model):
     meta_keywords = models.CharField(max_length=300, blank=True, null=True, help_text='این فیلد را حتما پر کنید')
     meta_rating = models.FloatField(default=5, help_text='امتیاز محصول')
     created_at = models.DateTimeField(auto_now_add=True, verbose_name='زمان ثبت محصول')
-    category = models.ForeignKey(SubCategoryModel, blank=True, null=True, on_delete=models.SET_NULL, related_name='products', verbose_name='دسته بندی محصول')
-    related_products = models.ManyToManyField('self',)
+    category = models.ForeignKey(SubCategoryModel,  null=True, on_delete=models.SET_NULL, related_name='products', verbose_name='دسته بندی محصول')
+    related_products = models.ManyToManyField('self', blank=True,)
     def format_discount_price(self):
         discount_price = int(self.price * (100 - self.discount) / 100)
         formatted_num = "{:,.0f}".format(discount_price)
@@ -156,7 +156,7 @@ class InStuckColors(models.Model):
         verbose_name = 'تعداد موجود رنگ'
         verbose_name_plural = 'تعداد موجود رنگ ها'
     def __str__(self):
-        return f'{product} - {color}'
+        return f'{self.product} - {self.color}'
 
 class CommentModel(models.Model):
     product = models.ForeignKey(ProductModel, on_delete=models.CASCADE, related_name='comments', verbose_name='محصول')