module Shoulda # :nodoc:
  module Private # :nodoc:
    # Returns the values for the entries in the args hash who's keys are listed in the wanted array.
    # Will raise if there are keys in the args hash that aren't listed.
    def get_options!(args, *wanted)
      ret  = []
      opts = (args.last.is_a?(Hash) ? args.pop : {})
      wanted.each {|w| ret << opts.delete(w)}
      raise ArgumentError, "Unsupported options given: #{opts.keys.join(', ')}" unless opts.keys.empty?
      return wanted.size == 1 ? ret.first : ret
    end
  end
end