Dry-driven settings

README.md

To ensure it's available for all initialisers, you can require the file within config/application.rb by adding require_relative "settings" as the last line within the Application class definition.

The defined settings will be available via the Settings constant: e.g. Settings.default_host

• Does not pay attention to Rails.configuration / Rails.application.credentials - it's expecting all secrets as ENV variables.
• Requires dry-types and dry-system gems.
• Allows for typed values (even if the above examples are all strings 😅).
• Allows for optional values and defaults.
• Inspired by Hanami's approach to such things.

settings.rb

# config/settings.rb

# frozen_string_literal: true

require "dry/system/provider_sources/settings/config"
require "dry/types"

class SettingsSchema < Dry::System::ProviderSources::Settings::Config
  include Dry.Types()

  setting :bugsnag_api_key, constructor: Strict::String, default: "placeholder"
  setting :bugsnag_release_stage, constructor: Strict::String, default: "production"

  setting :default_host, constructor: Strict::String, default: "calmcalendar.com"
  setting :postmark_api_token, constructor: Strict::String, default: "placeholder"

  setting :sidekiq_username, constructor: Strict::String.optional, default: nil
  setting :sidekiq_password, constructor: Strict::String.optional, default: nil

  def verify!
    config._settings.each do |setting|
      self[setting.name]
    rescue Dry::Types::ConstraintError
      raise ArgumentError, "Missing environment variable #{setting.name.upcase}"
    end

    finalize!
  end
end

Settings = SettingsSchema.load(root: Rails.root, env: Rails.env).tap(&:verify!)