From: "Rubén Medellín" <CHubas7@...>
Date: 2008-03-05T17:20:12+09:00
Subject: Re: Meta Programming Question

On Mar 5, 1:51 am, MohsinHijazee <mohsinhija...@gmail.com> wrote:
> Hello!
>
>    Consider this case:
>
>    myHash = {:a_line_of_code => "pre_count = Posts.count",
>                       :another_line => %q~message =
> get_formatted_message(#{pre_count})~}
>
> If I have a hash like this which contains code snippets as strings,
> How can I execute them? Moreover consider also that the second code
> snippet uses the value of the variable assigned in the first one.
>
> Regards,
> Mohsin

If you need to use a variable from a hash maybe you should be using it
outside the hash context. What I mean is that probably you shouldn't
be putting a variable there.
You can always use eval to execute strings, but may not be a great
idea.

In any case, you may use procs instead of storing variables if what
you want is dynamically generated values for the hash.

>> hash = {:something => proc{ Posts.count }, :other_thing => proc{|var| do_something_with(var)}}

and you could call

>> hash[:other_thing][hash[:something]]

but the ugliness of that cries desperately for a more elegant way. If
you need to execute code, I think there is a feature or Ruby called
errr, methods.

Could you give more details of what you are trying?