“Ruby 方式”（混合和类重新打开）与依赖注入

使用Ruby方式和依赖注入实现灵活的对象构建

ruby
class Person
  attr_accessor :name
  def initialize(name)
    @name = name
  end
end
# 混合方式
module Greetable
  def greet
    "Hello, my name is #{name}"
  end
end
person = Person.new("Alice")
person.extend(Greetable)
puts person.greet # 输出 "Hello, my name is Alice"
# 类重新打开方式
class Person
  def say_hello
    "Hello, my name is #{name}"
  end
end
person = Person.new("Bob")
puts person.say_hello # 输出 "Hello, my name is Bob"

ruby
class Logger
  def log(message)
    puts message
  end
end
class OrderProcessor
  def initialize(logger)
    @logger = logger
  end
  def process(order)
    # 处理订单逻辑
    @logger.log("Order processed: #{order}")
  end
end
logger = Logger.new
order_processor = OrderProcessor.new(logger)
order_processor.process("12345")