How to create a custom method for my rails model

Question

I have a Company model and a Payment model.

For my Company model I whish to create a custom (class/instance?) method that performs a sumproduct of a selected company's associated attributes.

My Company model:

def total_payments
  self.payments.map { |s| s.value * s.currency }.sum
end

However if I run Company.first.total_payments it gives me a no_method_error.

How to I properly define my method?

Answer 1

It seems like all good, just reload your rails console. Rails does not apply changes in your classes immediately.