Replace example.org when generating url in Rails

Step to reproduce:

rails new testurl
cd testurl
Add resources :tests, only: [:index] in config/routes.rb
Create a new file in app/views/test/test.html.erb with content of <%= tests_url %>.

What I need to do is render this view as HTML string, to do that I did the following:

rails c
Then run ApplicationController.render(template: 'test/test')

Running the code above gives me the following result:

irb(main):006:0> ApplicationController.render(template: 'test/test')
  Rendering layout layouts/application.html.erb
  Rendering test/test.html.erb within layouts/application
  Rendered test/test.html.erb within layouts/application (Duration: 0.6ms | Allocations: 127)
Everything's up-to-date. Nothing to do
  Rendered layout layouts/application.html.erb (Duration: 12.4ms | Allocations: 3390)
=> "<!DOCTYPE html>\n<html>\n  <head>\n    <title>Testurl</title>\n    <meta name=\"viewport\" content=\"width=device-width,initial-scale=1\">\n    <meta name=\"csrf-param\" content=\"authenticity_token\" />\n<meta name=\"csrf-token\" content=\"Cl5oXyPFrAsZl_s3m_fO1ELVkFtUajlnI30AOZ0BB9LJpMbXnGjgX1Ng_JvQhcFo3VMD67a467Cs4mjcB_ODmA\" />\n    \n\n    <link rel=\"stylesheet\" media=\"all\" href=\"/assets/application.debug-ead91a25923de99455378da7f1f1bb5a6839a249af27af911ec2b81709b046b7.css\" data-turbolinks-track=\"reload\" />\n    <script src=\"/packs/js/application-f826770d917d8a37c1d8.js\" data-turbolinks-track=\"reload\"></script>\n  </head>\n\n  <body>\n    http://example.org/tests\n\n  </body>\n</html>\n"

As you can see <%= tests_url %> is rendered as http://example.org/tests. Where is this http://example.org defined? And how to replace it?

I tried searching example.org in a new rails app and found the following piece of code in config/initializers/application_controller_renderer.rb:

# Be sure to restart your server when you modify this file.

# ActiveSupport::Reloader.to_prepare do
#   ApplicationController.renderer.defaults.merge!(
#    http_host: 'example.org',
#    https: false
#  )
# end

I tried uncommenting the code and replaced it with the following:

# Be sure to restart your server when you modify this file.

ActiveSupport::Reloader.to_prepare do
  ApplicationController.renderer.defaults.merge!(
    http_host: 'google.com',
    https: true
  )
end

Then after that, I restarted the app and rails console.

But still running ApplicationController.render(template: 'test/test') still gives me http://example.org where I expect it to be https://google.com. What seems to be the problem?

Environment:

Ruby 2.7.2
Rails 6.1.3

Solution

I haven't found out how to change example.org globally but the solution below works enough for me.

renderer = ApplicationController.renderer.new(
  http_host: 'google.com',
  https: true
)

renderer.render(template: 'test/test')

Now it returns:

irb(main):016:0> renderer.render(template: 'test/test')
  Rendering layout layouts/application.html.erb
  Rendering test/test.html.erb within layouts/application
  Rendered test/test.html.erb within layouts/application (Duration: 0.2ms | Allocations: 44)
Everything's up-to-date. Nothing to do
  Rendered layout layouts/application.html.erb (Duration: 15.7ms | Allocations: 3133)
=> "<!DOCTYPE html>\n<html>\n  <head>\n    <title>Testurl</title>\n    <meta name=\"viewport\" content=\"width=device-width,initial-scale=1\">\n    <meta name=\"csrf-param\" content=\"authenticity_token\" />\n<meta name=\"csrf-token\" content=\"M-u_LLixMIE-SgRpRiY0I-iqZiwvg2JAnJ14Oreqb8HCoQw5s7g00qPLMPg8kmmOImj1T-tekks_zMpMf0W_mQ\" />\n    \n\n    <link rel=\"stylesheet\" media=\"all\" href=\"/assets/application.debug-ead91a25923de99455378da7f1f1bb5a6839a249af27af911ec2b81709b046b7.css\" data-turbolinks-track=\"reload\" />\n    <script src=\"/packs/js/application-f826770d917d8a37c1d8.js\" data-turbolinks-track=\"reload\"></script>\n  </head>\n\n  <body>\n    https://google.com/tests\n\n  </body>\n</html>\n"

It now replaces http://example.com with https://google.com.