Add stats to admin

src/purchase/admin.py

@@ -6,19 +6,28 @@ from purchase.models import Basket, BasketItem, PaymentMethod, Product
 
 @register(Product)
 class ProductAdmin(admin.ModelAdmin):
-    list_display = ["name", "display_order", "unit_price"]
+    list_display = ["name", "display_order", "unit_price", "sold", "turnover"]
     list_editable = ["display_order"]
     search_fields = ["name"]
 
     def unit_price(self, instance: Product):
-        return instance.unit_price_cents / 100
+        return instance.unit_price_display
+
+    def sold(self, instance: Product):
+        return instance.sold
+
+    def turnover(self, instance: Product):
+        return instance.turnover_display
 
 
 @register(PaymentMethod)
 class PaymentMethodAdmin(admin.ModelAdmin):
-    list_display = ["name"]
+    list_display = ["name", "turnover"]
     search_fields = ["name"]
 
+    def turnover(self, instance: Product):
+        return instance.turnover_display
+
 
 class BasketItemInline(admin.TabularInline):
     model = BasketItem

src/purchase/models.py

@@ -17,6 +17,14 @@ class PaymentMethod(Model):
     def __str__(self):
         return self.name
 
+    @property
+    def turnover(self) -> int:
+        return sum(basket.price for basket in self.baskets.all())
+
+    @property
+    def turnover_display(self) -> str:
+        return f"{self.turnover / 100}€"
+
 
 def default_product_display_order():
     return Product.objects.last().display_order + 1
@@ -34,6 +42,22 @@ class Product(Model):
     def __str__(self):
         return self.name
 
+    @property
+    def unit_price_display(self) -> str:
+        return f"{self.unit_price_cents / 100}€"
+
+    @property
+    def turnover(self) -> int:
+        return sum(items.price for items in self.basket_items.all())
+
+    @property
+    def turnover_display(self) -> str:
+        return f"{self.turnover / 100}€"
+
+    @property
+    def sold(self):
+        return sum(items.quantity for items in self.basket_items.all())
+
     def save(self, *args, **kwargs):
         super().save()
         with Image.open(self.image.path) as img: