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Add example of simple environment config extending 

Follow up to https://github.com/rails/rails/issues/47570

[ci skip]

Update guides/source/configuring.md

Co-authored-by: Hartley McGuire <skipkayhil@gmail.com>

Update guides/source/configuring.md

Co-authored-by: Jonathan Hefner <jonathan@hefner.pro>
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Wojciech Wnętrzak 2023-03-15 07:37:09 +01:00
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@ -3018,7 +3018,16 @@ development:
By default Rails ships with three environments: "development", "test", and "production". While these are sufficient for most use cases, there are circumstances when you want more environments.
Imagine you have a server which mirrors the production environment but is only used for testing. Such a server is commonly called a "staging server". To define an environment called "staging" for this server, just create a file called `config/environments/staging.rb`. Please use the contents of any existing file in `config/environments` as a starting point and make the necessary changes from there.
Imagine you have a server which mirrors the production environment but is only used for testing. Such a server is commonly called a "staging server". To define an environment called "staging" for this server, just create a file called `config/environments/staging.rb`. Since this is a production-like environment, you could copy the contents of `config/environments/production.rb` as a starting point and make the necessary changes from there. It's also possible to require and extend other environment configurations like this:
```ruby
# config/environments/staging.rb
require_relative "production"
Rails.application.configure do
# Staging overrides
end
```
That environment is no different than the default ones, start a server with `bin/rails server -e staging`, a console with `bin/rails console -e staging`, `Rails.env.staging?` works, etc.