Feature

manage.py

@@ -7,6 +7,7 @@
 def main():
     """Run administrative tasks."""
     os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'config.settings')
+    os.environ["PATH"] += os.pathsep + 'C:/Program Files/Graphviz/bin'
     try:
         from django.core.management import execute_from_command_line
     except ImportError as exc:

products/models.py

@@ -1,5 +1,6 @@
 from django.contrib.auth import get_user_model
 from django.db import models
+from decimal import Decimal
 
 
 class Product(models.Model):
@@ -23,6 +24,20 @@ class Product(models.Model):
     def shop_name(self):
         return self.seller.shop_name
 
+    def calculate_final_price(self):
+        """
+        Расчет финальной стоимости товара
+        """
+
+        base_price = self.price
+        tax = base_price * Decimal('0.06')  #: Налог
+        bank_fee = base_price * Decimal('0.02')  #: Комиссия банку
+        author_commission = base_price * Decimal('0.02')  #: Комиссия за транзакцию продавца
+        marketplace_fee = base_price * Decimal('0.20')  #: Выручка маркетплейса
+
+        final_price = base_price + tax + bank_fee + author_commission + marketplace_fee
+        return final_price
+
     def __str__(self):
         return f'{self.product_title} {self.shop_name} {self.seller}'
 

products/views.py

@@ -18,6 +18,9 @@ def perform_create(self, serializer):
 
         new_product = serializer.save(seller=self.request.user)
         new_product.seller = self.request.user
+
+        total_price = new_product.calculate_final_price()
+        new_product.price = total_price
         new_product.save()
 
 

pyproject.toml

@@ -22,6 +22,8 @@ django-extensions = "^3.2.3"
 ipython = "^8.15.0"
 django-filter = "^23.3"
 pillow = "^10.0.1"
+pyparsing = "^3.1.1"
+pydot = "^1.4.2"
 
 
 [build-system]