Question

I want to expand a method to the String class in Sinatra, in the erb file, do something like

<%= 'some string'.my_method %> 

but I don’t know how to put the definition code:

String.class_eval do
  def my_mythod
    some_code
  end
end

By the way I’m using the sinatra modular coding style

Answer 1

I tend to stick code like this in its own file, under the lib/ext folder. Then, you can require this file from your Sinatra app.

Under lib/ext/string.rb:

class String
  my_mythod
    some_code
  end
end

Then add the following to your Sinatra app, assuming your base class file is inside the lib folder:

require File.dirname(__FILE__) + '/ext/string' 

I’d be interested to see what over people think on this as well.