Rails 4 Sum by Model Method

Question

In my app, I have a User model, with a goal_ytd method, which performs some calculations.

In a controller, I have a variable @users

Answer 1

On Rails 4.1

If goal_ydt is a column in the users table:

@users.sum(:goal_ydt)

If goal_ydt is a method in User class:

@users.to_a.sum(&:goal_ydt)