From: "Iñaki Baz Castillo" <ibc@...>
Date: 2008-04-30T22:40:33+09:00
Subject: Re: How to create "def method(item)= (value)" ?

2008/4/30, Chris Hulan <chris.hulan@gmail.com>:
> Why not just access param?
>
>  class Foo
>   def initialize
>     @param = {}
>   end
>   attr_accessor :param
>  end
>
>  x = Foo.new
>  x.param['key'] = 'bar'
>
>
>  If you do need to override it, the Hash assignment method is []=
>  So I think you can write:
>  def []=(key,value)
>  ...

Because I need to give value to an attribute of a class containing the
Hash @params, so the only way (AFAIK) is by creating an abstraction
layer and handling the Hash @params via current class methods. This is
my case:


class Uri

  # Atributes:
  @modified   =>  true/false
  @params => Hash

   attr_accessor :modified

   #what I want but it's not possible:
   def param(name)= (value)
      @params[name] = value
      @modified = true
   end

end


I can't do it by extending Hash class since inside Hash class I can't
modify @modified attribute.
Also note there are more ways than "=" to modify a Hash value:
  @params[name].strip!   ,   .chomp!   ,   .downcase!  ......
and I don't want to redefine all of them so I just want to allow "="
and when it's called @modifed must be true.


Hope I've explained why attr_accessor is not useful for me in this case.


Thanks a lot.




-- 
Iñaki Baz Castillo
<ibc@aliax.net>