Use user primary key in pizza API
Previous behaviour
Steps to reproduce:
- Create multiple users and make sure the member pk is not equal to the user model pk.
- Create a pizza event and place an order.
- Notice that the value of 'member' is not equal to the user model pk.
New behaviour
Steps to validate that it works:
- Create multiple users and make sure the member pk is not equal to the user model pk.
- Create a pizza event and place an order.
- Notice that the value of 'member' is equal to the user model pk.