Question

Lets say Users have BankAccounts which have a balance value.

So, how do I generate an array that Users and the total value of all their BankAccounts’ values added together?

Answer 1

I’m not sure if this is quite what you want, but you can do something like:

ActiveRecord::Base.connection.select_all("select user_id, sum(balance) from accounts group by user_id;")

This will give you an array of user_ids and balances from the accounts table. The advantage of doing it this way is that it comes down to only one SQL query.