Dependency Injection example

dependency_injection_example.rb

# Source: https://discuss.dry-rb.org/t/examples-of-how-to-use-dry-container-dry-auto-inject/82/9

require 'dry-container'
require 'dry-auto_inject'

module Api
  def self.configure
    container.register :main_component, -> { MainComponent.new }
    container.register :dependency, -> { Dependency.new }
    container.freeze
  end

  def self.try_dry_rb_container
    container.resolve(:main_component).hello_world
  end

  private

  @@container = Dry::Container.new

  AutoInject = Dry::AutoInject(@@container)

  def self.container
    @@container
  end
end

class MainComponent
  include Api::AutoInject[:dependency]

  def hello_world
    dependency.say_hi
  end
end

class Dependency
  def say_hi
    "Hi from dry-rb dry-container injected with dry-auto-inject"
  end
end

Api.configure
puts Api.try_dry_rb_container