Setting global instance variable based on domain in Rails

Question

I have a single Rails application that is currently being accessed via lets say https://www.domain1.com and I would like to enable the application to be accessed by a second domain, lets say https://www.domain2.com which would then set a global instance variable.

I would then like to use this instance variable to control certain things on the page such as content, styles and images.

Any ideas how I could achieve this?

Mori · Accepted Answer · 2022-07-05 02:19:35Z

2

E.g.

def my_action
  @domain_instance_variable = request.domain
  $domain_global_variable = request.domain
end

A global variable and an instance variable are different things. An instance variable is scoped to an instance of a class, and a global variable has a global scope. It's a good rule of thumb to minimize scope.

In the case of Rails code in controllers, views or helpers, you can just call request.domain directly instead of assigning that to a variable.

answered Jul 5, 2022 at 2:19

Mori

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1 Comment

gok-nine Over a year ago

Thanks, this worked nicely. I ended up adding a before_action into my application controller that would set the instance variable and then I pick that up in my views.

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