Added ManytoManyField in Booking model

MagisAir/booking/admin.py

@@ -42,7 +42,7 @@ class Booking_SchedAdmin(admin.ModelAdmin):
 
 class Booking_AddItemAdmin(admin.ModelAdmin):
     model = Booking_AddItem
-    list_display = ('Booking_ID', 'AddItem_Desc', 'Quantity', 'subtotal')
+    list_display = ('Booking_ID', 'AddItem_Desc', 'Quantity', 'Subtotal')
 
 class PilotAdmin(admin.ModelAdmin):
     model = Pilot

MagisAir/booking/migrations/0002_booking_additional_item.py

+# Generated by Django 4.0.4 on 2022-12-01 05:22
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('booking', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='booking',
+            name='Additional_Item',
+            field=models.ManyToManyField(through='booking.Booking_AddItem', to='booking.additional_item'),
+        ),
+    ]

MagisAir/booking/models.py

@@ -31,23 +31,25 @@ class Passenger(models.Model):
     def __str__(self):
         return self.First_Name + ' ' + self.Last_Name
 
+        
+class Additional_Item(models.Model):
+    Description = models.CharField(max_length=50, primary_key=True, editable=True, unique=True)
+    Item_Cost = models.IntegerField(default=0)
+
+    def __str__(self):
+        return self.Description 
+
 
 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.IntegerField(blank=True, default=0,null=False)
     Passenger = models.ForeignKey(Passenger, on_delete=models.CASCADE)
+    Additional_Item = models.ManyToManyField(Additional_Item, through='Booking_AddItem')
 
     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)
 
-    def __str__(self):
-        return self.Description 
 
 class Booking_AddItem(models.Model):
     class Meta:
@@ -56,13 +58,14 @@ class Booking_AddItem(models.Model):
     Booking_ID = models.ForeignKey(Booking, on_delete=models.CASCADE)
     AddItem_Desc = models.ForeignKey(Additional_Item, on_delete=models.CASCADE)
     Quantity = models.IntegerField(default=0)
+    Subtotal = models.IntegerField(default=0, editable=False)
 
     @property
-    def subtotal(self):
+    def save(self):
         add_item = Additional_Item.objects.get(Description = self.AddItem_Desc)
         itemcost = add_item.Item_Cost
-        subtotal = itemcost*self.Quantity
-        return subtotal
+        self.subtotal = itemcost*self.Quantity
+        return super().save()