Question

我有一个看起来像这样的课程：

class Base < Library
  prelude "some-value"        # from Library
  def foo; ...; end

  prelude "some-other-value"  # from Library
  def bar; ...; end

  # ... others
end

我想将其重构为以下内容：

class Base < Library
  # what goes here to bring FooSupport and BarSupport in?
end

class FooSupport (< ... inherit from something?)
  prelude "..."   # Need a way to get Library prelude.
  def foo; ...; end
end

class BarSupport (< ... inherit from something?)
  prelude "..."   # Need a way to get Library prelude.
  def bar; ...; end
end

我该怎么做？

Answer 1

您需要的是include。您可能以前在模块中使用它，但它也可以在类中工作，因为Class继承自Ruby中的Module。将支持方法放在模块中，并将include放在主类中。

至于prelude类方法，只需在模块的included方法中给出的对象上调用它。

<强> base.rb：

require "foo"
require "bar"

class Base < Library
  include FooSupport
  include BarSupport
end

<强> foo.rb：

module FooSupport
  def self.included (klass)
    klass.prelude "..."
  end

  def foo; "..." end
end

修改：如果您需要散布对prelude的调用和方法定义，您可能需要使用更像这样的内容：

module FooSupport
  def self.included (klass)
    klass.class_eval do
      prelude "..."
      def foo; "..." end

      prelude "..."
      def bar; "..." end
    end
  end
end

我怎样才能重构这个简单的Ruby片段？

1 个答案: