How to interpolate in a ruby method name

Question

Is it possible to interpolate in a method name? I'm trying to make this work def "cancel_#{appointment.id}" but having no luck. thanks

Answer 1

Use define_method .

define_method "cancel_#{appointment.id}" do
  # your method body
end

Answer 2

Using define_method is best, but one could instead use the version of Module#class_eval which takes a string as an argument:

class C
end

x = 'cat'
C.class_eval "def #{x}; 'meow'; end"
C.instance_methods.include?(:cat)
  #=> true
C.new.cat
  #=> 'meow'