chore: add subtotal to attributes of Booking_AddItem

MagisAir/booking/admin.py

@@ -10,7 +10,7 @@ class PassengerAdmin(admin.ModelAdmin):
 
 class BookingAdmin(admin.ModelAdmin):
     model = Booking
-    list_display = ('Booking_ID', 'Booking_Date', 'Total_Cost', 'Passenger')
+    list_display = ('Booking_ID', 'Booking_Date', 'Passenger', 'Total_Cost')
 
 class Sched_CrewAdmin(admin.ModelAdmin):
     model = Sched_Crew
@@ -42,7 +42,7 @@ class Booking_SchedAdmin(admin.ModelAdmin):
 
 class Booking_AddItemAdmin(admin.ModelAdmin):
     model = Booking_AddItem
-    list_display = ('Booking_ID', 'AddItem_Desc', 'Quantity')
+    list_display = ('Booking_ID', 'AddItem_Desc', 'Quantity', 'subtotal')
 
 class PilotAdmin(admin.ModelAdmin):
     model = Pilot

MagisAir/booking/models.py

 from django.db import models
+from django.http import Http404
 from django.core.validators import RegexValidator,EmailValidator
 
 # Create your models here.
@@ -34,9 +35,13 @@ class Passenger(models.Model):
 class Booking(models.Model):
     Booking_ID = models.AutoField(primary_key=True, editable=False, unique=True)
     Booking_Date = models.DateField(null=True, blank=True)
-    Total_Cost = models.CharField(max_length=100)
+    Total_Cost = models.IntegerField(blank=True, default=0,null=False)
     Passenger = models.ForeignKey(Passenger, on_delete=models.CASCADE)
 
+    def __str__(self):
+        return str(self.Booking_ID)
+   
+        
 class Additional_Item(models.Model):
     Description = models.CharField(max_length=50, primary_key=True, editable=True, unique=True)
     Item_Cost = models.IntegerField(default=0)
@@ -52,6 +57,15 @@ class Booking_AddItem(models.Model):
     AddItem_Desc = models.ForeignKey(Additional_Item, on_delete=models.CASCADE)
     Quantity = models.IntegerField(default=0)
 
+    @property
+    def subtotal(self):
+        add_item = Additional_Item.objects.get(Description = self.AddItem_Desc)
+        itemcost = add_item.Item_Cost
+        subtotal = itemcost*self.Quantity
+        return subtotal
+
+    
+
 class City(models.Model):
     Airport_Code = models.AutoField(primary_key=True, editable=False, unique=True)
     Airport_name = models.CharField(max_length=50)