Using custom functions in rails app

Question

I am trying to follow the short example in the following answer on using custom functions in rails:

http://stackoverflow.com/questions/2879679/where-to-put-code-snippets-in-rails

In math.rb in lib/math.rb

module Math
    class << self
        def cube_it(num)
          num*3
        end
    end
end

In rails console I have tried

include Math
Math.cube_it(2)

But I get the error:

NoMethodError: undefined method 'cube_it' for Math:module

Fivell · Accepted Answer · 2012-01-29T13:38:58.767

1

check config/application.rb for next line

# Custom directories with classes and modules you want to be autoloadable.
config.autoload_paths += %W(#{config.root}/lib)

So if you have still unloadable extension you can type

require 'math'

and recheck

instead of call require, you can create config/initializers/lib.rb

with

Dir[File.join(Rails.root, "lib", "*.rb")].each {|l| require l }

edited Jan 29 '12 at 13:38

answered Jan 29 '12 at 12:53

Fivell

I have added the above line, and also rebooted my linode server however I still get the same error. When I type **include Math** into rails console it returns object, when I type **Math.cube_it(2)** afterwards it gives the same error – Zakoff Jan 29 '12 at 13:05
try reload! and then Math.methods.grep /cube/ – Fivell Jan 29 '12 at 13:12
it only can mean that your extension still unloaded. Check methods which Math contains from console , as I mentioned above – Fivell Jan 29 '12 at 13:17
When I do the above that you suggested **try reload! and then Math.methods.grep /cube/** it returns **[]** – Zakoff Jan 29 '12 at 13:20
strange... It just means that your extenstion still unloaded – Fivell Jan 29 '12 at 13:26

1 Answers1