From: John Mair <jrmair@...>
Date: 2010-10-31T05:06:44+09:00
Subject: Re: Dynamically reference instance vars

You realize that instance_variable_set isn't private right?

So you can simply go:

    my_object.instance_variable_set("@#{iname}", ivalue)

Greg Willits wrote in post #958159:
> If I need to dynamically reference instance vars, is this the only way
> to do it (var set example)?
>
>   my_object.send(:instance_variable_set, "@#{iname}", ivalue)
>
> I expected something more elegant, but this is the only way I can get it
> to work. No biggie, just curious.
>
> More complete example below.
>
> -- gw
>
>
> class Shape
>   attr_accessor :size, :fill_color, :line_color, :line_width
>   def initialize
>     @size = ""
>     @fill_color = ""
>     @line_color = ""
>     @line_width = ""
>   end
> end
>
> my_shape = Shape.new
>
> shape_details = {
>   :size => 'small',
>   :fill_color => 'red',
>   :line_color => 'black',
>   :line_width => '2'}
>
> shape_details.each do |iname, ivalue|
>   my_shape.send(:instance_variable_set, "@#{iname}", ivalue)
> end

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