fix

core/apps/orders/admin/order.py

@@ -1,7 +1,7 @@
 from django.contrib import admin
 
 # orders
-from core.apps.orders.models import Order, OrderItem
+from core.apps.orders.models import Order, OrderItem, Payment
 
 
 class OrderItemInline(admin.TabularInline):
@@ -9,7 +9,12 @@ class OrderItemInline(admin.TabularInline):
     extra = 0
     
 
+class PaymentInline(admin.TabularInline):
+    model = Payment
+    extra = 0
+
+
 @admin.register(Order)
 class OrderAdmin(admin.ModelAdmin):
     list_display = ['id', 'employee_name', 'advance', 'paid_price', 'total_price']
-    inlines = [OrderItemInline]
+    inlines = [OrderItemInline, PaymentInline]

core/apps/orders/models/payment.py

@@ -12,5 +12,5 @@ class Payment(BaseModel):
     price = models.DecimalField(max_digits=15, decimal_places=2)
     
     def __str__(self):
-        return self.price
+        return f'{self.price}'