Question

I am trying to extend a module method in a class for a mixin.

Here is my code:

module Mod_1
    def bar
        puts "xxx"
    end
end

class Class_A
    include Mod_1
    def bar
        super
        puts "yyy"
     end
end

test = Class_A.new
test.bar

The best way of doing I could think of is:

module Mod_1
    def Mod_1.foo
        puts "aaa"
    end
end

class Class_A
    include Mod_1
    def foo
        Mod_1.foo
        puts "bbb"
     end
end

test = Class_A.new
test.foo

Is there a better way I can do this?

Answer 1

See the below:

module Bar
    def foo
        puts "first"
    end
end

class Class_A
    include Bar
    alias old_foo foo
    def foo
        old_foo
        puts "second"
    end
end

Class_A.new.bar

Returning:

"first"
"second"

This uses aliasing. I would recommend looking them up for Ruby specially for something like what you are trying to do.

Have a read of:
http://ruby.about.com/od/rubyfeatures/a/aliasing.html