class EnvConfiguration

Provide a better interface for accessing configuration options stored in ENV. Keys are accepted as symbols and turned into upcased strings. Nesting is provided by double underscores.

This interface mirrors what is used for ActiveSupport::EncryptedConfiguration and thus allows both to serve as interchangeable backends for Rails.app.credentials.

Examples:

require(:db_host)                                   # => ENV.fetch("DB_HOST")
require(:database, :host)                           # => ENV.fetch("DATABASE__HOST")
option(:database, :host)                            # => ENV["DATABASE__HOST"]
option(:debug, default: "true")                     # => ENV.fetch("DEBUG", "true")
option(:database, :host, default: -> { "missing" }) # => ENV.fetch("DATABASE__HOST") { "missing" }