derived-attribute

问题 I have two entities in my app: User & Expense . A user has many expenses. Expense as an attribute amount (of type Int32). I added a derived attribute expensesCount (of type Int16) on the user to count the number of expenses, using the derivation expenses.@count . It's working fine, the app compiles, launches, and when I save a relationship, the value for the expensesCount attribute is updated. I also added a derived attribute expensesAmount on the user to count the total amount of all related

问题 I have two entities in my app: User & Expense . A user has many expenses. Expense as an attribute amount (of type Int32). I added a derived attribute expensesCount (of type Int16) on the user to count the number of expenses, using the derivation expenses.@count . It's working fine, the app compiles, launches, and when I save a relationship, the value for the expensesCount attribute is updated. I also added a derived attribute expensesAmount on the user to count the total amount of all related

问题 I have two entities in my app: User & Expense . A user has many expenses. Expense as an attribute amount (of type Int32). I added a derived attribute expensesCount (of type Int16) on the user to count the number of expenses, using the derivation expenses.@count . It's working fine, the app compiles, launches, and when I save a relationship, the value for the expensesCount attribute is updated. I also added a derived attribute expensesAmount on the user to count the total amount of all related

问题 I have two entities in my app: User & Expense . A user has many expenses. Expense as an attribute amount (of type Int32). I added a derived attribute expensesCount (of type Int16) on the user to count the number of expenses, using the derivation expenses.@count . It's working fine, the app compiles, launches, and when I save a relationship, the value for the expensesCount attribute is updated. I also added a derived attribute expensesAmount on the user to count the total amount of all related