From: Mike Cahill <mike.cahill@...>
Date: 2007-05-19T11:17:32+09:00
Subject: Re: Why "NoMethodError" occurs

U passed "332" as a string so it was stored as a string.   Take the quotes off 332 or better, in ur init, say @duration=duration.to_i

Mike
  

-----Original Message-----
From: "gao bo" <gaob06@gmail.com>
Date: Sat, 19 May 2007 11:07:17 
To:ruby-talk@ruby-lang.org (ruby-talk ML)
Subject: Why "NoMethodError" occurs

hi, everyone
today i typed the code below in my IDE

class Song
  attr_reader :name, :artist, :duration
  attr_writer :duration

  def initialize(name, artist, duration)
    @name = name
    @artist = artist
    @duration = duration
  end

  def durationInMinutes
    @duration/60.0
  end

  def durationInMinutes=(value)
    @duration = (value * 60).to_i
  end
end

class Song
  def to_s
    "song: #{@name}--#{@artist}  (#{@duration})"
  end
end

aSong = Song.new("hello", "zhutou","332")

puts aSong.to_s
puts aSong.durationInMinutes

And i tried to run it, but the error occured:

song: hello--zhutou  (332)
song.rb:12:in `durationInMinutes': undefined method `/' for "332":String
(NoMethodError)
 from song.rb:29

Why?

Thanks!