How to access one variable across the page in ruby?

Question

Now I am new in ruby language. Currently learning ruby. I am expert coder in the PHP. Basically I am working in the CakePHP. CakePHP and Ruby directory structure approximately same. But I am confusing little bit in the Ruby Code.

In CakePHP while I am define any variable in bootstrap.php I am getting this variable across the site.

Suppose I have a variable name $gallery_path = 'files/gallery/'; If I echo $gallery_path in controller, model and view. I am getting my gallery path.

But here in ruby I am unable to define any variable like php bootstrap.php Please suggest me.

What sort of variables are you trying to define? Ruby strongly encourages people to organize these into modules or classes to simplify access and keep them from conflicting. — tadman
– tadman, Commented Apr 25, 2016 at 8:00
what Chinu is talking about in PHP is called global variable. So his question is : How can I use the global variable feature from PHP in Ruby... — Martin Verjans
– Martin Verjans, Commented Apr 25, 2016 at 8:51
Possible duplicate of Ruby on Rails: Where to define global constants? — Holger Just
– Holger Just, Commented Apr 25, 2016 at 10:35

tadman · Accepted Answer · 2016-04-25 08:04:18Z

2

For things that change frequently enough that you need to edit them now and then, but infrequently enough that you're not constantly changing it, a simple module works well here.

You can start with something like this:

module SiteConfiguration
  mattr_accessor :site_name
  mattr_accessor :payment_provider
end

Then you can configure that in config/environment.rb:

SiteConfiguration.site_name = 'The Site'
SiteConfiguration.payment_provider = 'PayPal'

These are accessible everywhere in your app.

answered Apr 25, 2016 at 8:04

tadman

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12 Comments

Chinmay235 Over a year ago

Can you please say me about the module Siteconfiguration?

Chinmay235 Over a year ago

I am getting error message uninitialized constant ApplicationController::SiteConfiguration

tadman Over a year ago

@Chinu You need to put site_configuration.rb somewhere that's auto-loaded. app/concerns is one place that's usually checked.

Chinmay235 Over a year ago

Ok. Let me know how to get site name in my layout?

tadman Over a year ago

It's just as you would with anything: <%= SiteConfiguration.site_name %>.

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Artem Biserov · Accepted Answer · 2016-04-25 07:30:00Z

0

you can use environment variables, try this gem: https://github.com/bkeepers/dotenv or you can define them:

ENV["host"] = "localhost:3000"

answered Apr 25, 2016 at 7:30

Artem Biserov

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Comments

Developer · Accepted Answer · 2016-04-25 08:15:07Z

0

Your application_controller.rb should be write below

$gallery_path = 'files/gallery/';

Your view file

<%=$gallery_path %>

answered Apr 25, 2016 at 8:15

Developer

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1 Comment

tadman Over a year ago

This is extremely messy and should be an absolute last resort. Global variables are used very, very sparingly in Ruby.

Sherlock_Stalker · Accepted Answer · 2016-04-25 09:18:33Z

0

I think you mean global variables. In Ruby-on-Rails you can write it like

Controller:

@value = 2+1

HTML:

<%= @value %>

So your output in your browser will be "3"

edited Apr 25, 2016 at 9:18

answered Apr 25, 2016 at 7:58

Sherlock_Stalker

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