How to set global variables to use everywhere in my application?

Question

I am using Ruby on Rails 3 and I would like to set some global variable to use those everywhere in my application. In particular, the domain name.

If, for example, my website URL is

http://subname.domain.com

I would like to set or retrieve the subname.domain.com value in order to use that in my application like this

request_uri = "http://#{sub_domain_name}"

Where and how I have to state\initialize the sub_domain_name variable or other variables at all?

Possible duplicate of [Best way to create custom config options for my Rails app?](http://stackoverflow.com/questions/592554/best-way-to-create-custom-config-options-for-my-rails-app) — Salim Mahboubi, Jan 07 '17 at 16:45

score 2 · Accepted Answer · answered Mar 01 '11 at 09:31

Application controller is one place where you can set global variable. Just call a before_filter method in the landing function of the application.

If your question is specific to retrieving domain name of your application, you can use request.env['HTTP_HOST'].

Thanks....

score 0 · Answer 2 · answered Mar 01 '11 at 23:25

0

You can add an initialiser in config/initializers/ where you can declare and set the values of global variables / singletons, which would be available to your app.

answered Mar 01 '11 at 23:25

rmk

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I must declare those like `VARIABLE` or can I use `variable`? – user502052 Mar 01 '11 at 23:29

How to set global variables to use everywhere in my application?

2 Answers2