Question

I’m trying to dynamically define functions that call through to another function that takes an options parameter:

class MyClass   ['hour', 'minute', 'second'].each do |interval|     define_method 'get_#{interval}' do |args|       some_helper(interval, args)     end   end   def some_helper(interval, options={})     # Do something, with arguments   end end 

I’d like to be able to call the different methods on MyClass in these two ways (with and without optional arguments):

mc = MyClass.new mc.get_minute( :first_option => 'foo', :second_option => 'bar') mc.get_minute  # This fails with: warning: multiple values for a block parameter (0 for 1) 

On the second call to minute, I see this warning:

warning: multiple values for a block parameter (0 for 1)

1. Is there a way to write the block for the ‘get_*’ method so that this warning won’t come up?
2. Am I abusing define_method?

Answer 1

The only change you need to make is to change args to *args. The * indicates that args will contain an array of optional arguments to the block.