add is_new field

backend/product/serializers.py

@@ -1,8 +1,11 @@
 from .models import *
 from rest_framework import serializers
+from django.utils import timezone
+from datetime import  timedelta
 
 class ProductChatSerializer(serializers.ModelSerializer):
     price = serializers.SerializerMethodField()
+    is_new = serializers.SerializerMethodField()
     class Meta:
         model = ProductModel
         fields = ['name', 'description', 'price', 'in_stock', 'discount', ]
@@ -19,6 +22,9 @@ class ProductChatSerializer(serializers.ModelSerializer):
         elif obj.currency == 'derham':
             toman_price =  obj.price * dollor_price * dollar_to_dirham
         return "{:,.0f} تومان".format(toman_price)
+    def get_is_new(self, obj):
+        return timezone.now() < obj.created_at + timedelta(days=7)
+
 class ProductSerializer(ProductChatSerializer):
     class Meta:
         model = ProductModel