Starting in Rails 5.2+, the framework now comes with a built in way to encrypt configuration credentials and environment variables. In previous versions an application would need to use a tool such as dotenv or figaro, and you could NEVER include the variable values in version control for security reasons. However, now all of the credentials are encrypted, and a single master key can decrypt them. This means that your team can add the credentials to version control and share them with much more ease.
Below is a cheat sheet that shows the common commands needed to work with Rails encrypted credentials.
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Generate a New Application Secret
Querying Flat Keys
Querying Nested Keys