Rails dynamic method name

Question

I want to have dynamic method names like usd_to_eur eur_to_usd

i have currencies = ['uah','rur','usd','eur'] and want to mix it

i try to do it with define_method but not sure how to do it correctly.

Answer 1

class MyClass
  CURRENCIES = %w|uah rur usd eur|
  CURRENCIES.permutation(2).each do |(c1, c2)|
    define_method(:"#{c1}_to_#{c2}") do
      puts "Hi, I am #{__callee__} method"
    end
  end
end

Now you have 12 methods defined. E.g.:

MyClass.new.eur_to_usd
#⇒ Hi, I am eur_to_usd method