我如何自动创建一个目录中每一个类的实例？ [英] How do I create automatically a instance of every class in a directory?

问题描述

如何在Ruby中我做的每个文件在目录中创建的每一个类的实例，
提供它作为一个数组？

How do I in ruby create an instance of every class in each file in a directory and providing it as an array?

感谢你在前进！

推荐答案

您可以使用的ObjectSpace 来发现新的类，然后实例化它们。

You can use the ObjectSpace to find the new classes and then instantiate them.

def load_and_instantiate(class_files)
  # Find all the classes in ObjectSpace before the requires
  before = ObjectSpace.each_object(Class).to_a
  # Require all files
  class_files.each {|file| require file }
  # Find all the classes now
  after = ObjectSpace.each_object(Class).to_a
  # Map on the difference and instantiate
  (after - before).map {|klass| klass.new }
end

# Load them!
files = Dir.glob("path/to/dir/*.rb")
objects = load_and_instantiate(files)

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