From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2008-11-13T21:09:33+09:00
Subject: Re: Using Class methods

On Thu, Nov 13, 2008 at 12:45 PM, sa 125 <s_ayalon@hotmail.com> wrote:
> Hi - I'm new to ruby and trying to write some classes to help me with my
> work. What I'm trying to figure out is how to access the class methods
> from other files. Say that my class is
>
> Class Example
>
>  $glob_1
>
>  def method_1
>    #...
>  end
>
>  def method_2
>    #...
>  end
>
> end
>
> Then in another file (same dir) I'd do:
>
> require 'example'
>
> f = example.method_1
>
> Is this correct?

Did you try it?
It won't work. There are several reasons. Class methods are defined like this:

class Example
def self.method1
   puts "method1"
end

def Example.method2
  puts "method2"
end

class << self
   def method3
      puts "method3"
   end
end

end

Then in your other file, the require is fine (if the file is called example.rb).
But the class methods have to be invoked on the class object, which is assigned
to the constant after the word class. So it's Example with capital E.

require 'example'

Example.method1

> Also, I want to test my class - where do I add the:
>
> if __FILE__ = $0
>  method_1
>  method_2
> end

It's usually added at the end of the file, after the class is defined.
Also here you will need to call the methods as Example.method_1

Hope this helps,

Jesus.