I have a class ConstData: class ConstData US_CITIES = [‘miami’, ‘new york’] EUROPERN_CITIES =

Question

Asked: May 17, 20262026-05-17T22:09:12+00:00 2026-05-17T22:09:12+00:00

I have a class ConstData:

class ConstData

  US_CITIES = ['miami', 'new york']

  EUROPERN_CITIES = ['madrid', 'london']

end

Its stored under /lib/const_data.rb

The idea is that inside a model, controller or view I can do:

ConstData::US_CITIES to get the US_CITIES etc

However this does not work. Can anyone explain me how to accomplish this ?

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Editorial Team · Answer 1 · 2026-05-17T22:09:13+00:00

Editorial Team

The post @daniel refers to is from 2008. Rails has changed since then.
In fact, quite recently. Rails3 doesn’t load the lib/ directory automatically.

You can reactivate it quite easily though. Open config/application.rb And add, in the config (in the Application class) the followin :

config.autoload_paths += %W(#{config.root}/lib)

Then your lib/ dir will be autoloaded.

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