From: Tomaso Tosolini <tomaso.tosolini@...>
Date: 2007-12-28T19:55:00+09:00
Subject: Re: Executing ruby code stored as a string in a database


Hi
have you tried with class_eval? when you have to execute ruby code contained
in a string it should be fine for you

def define_validation_method(name, method_body)
        self.class.class_eval("

        def #{name}
                #{method_body}
        end

")
end
 
Hope this helps
Tom


Etienne Van tonder wrote:

> I'm trying to retrieve some ruby code from a database as a string, I
> would then like to execute this code. So far I've tried many approaches
> but my latest uses define_method.
> 
> I have a method defined to use define_method, i.e.
> 
>     def define_validation_method(name, &block)
>       self.class.send(:define_method, name, &block)
>     end
> 
> What I would like to do is pass the code that I want executed to this
> method as an example:
> 
> function_module = define_validation_method(
>   :validate_object)
> "do |x, y, z|
>   if x > 1
>    x = y + z
>   else
>    x = y - z
>   end
> end"
> 
> This of course does not work as the method expects a block not a string.
> Can anyone suggest how to get this method to work, or suggest another
> method. The code is being executed within a ruby class.
> 
> Thanks.