Ruby Dependency Injection

DI_example.rb

class Injectable
    def can_you_see_me?
        puts "SEEN!"
    end
end

class Person
    attr_accessor :seer
    def initialize(seer)
        @seer = seer
    end
    
    def see_me
        seer.new.can_you_see_me?
    end
end

person = Person.new(Injectable)
person.see_me
# outputs "SEEN!"