Question

我将模块分开，以便更容易阅读和搜索

lib
  features
    - running.rb
    - walking.rb
  features.rb

他们有

# lib/features/running.rb
module Features::Running
  extend ActiveSupport::Concern

  module ClassMethods
    def can_run
      ...
    end
  end
end

另一个是：

# lib/features/walking.rb
module Features::Walking
  extend ActiveSupport::Concern

  module ClassMethods
    def can_walk
      ...
    end
  end
end

总有一天我可能会有这么多。

我的问题是当我想在模型中添加它们时，我需要

# Sample model
class Man < ActiveRecord::Base
  # Include features modules
  include Features::Walking
  include Features::Running

  # Define what man can do
  can_walk
  can_run
end

我想知道是否有办法创建另一个模块并包含所有模块。类似的东西：

# lib/features.rb
module Features
  extend ActiveSupport::Concern

  extend Features::Walking
  extend Features::Running
end

所以我只需要添加

# Sample model
class Man < ActiveRecord::Base
  # Include features modules
  include Features

  # Define what man can do
  can_walk
  can_run
end

或者我应该怎么做？

编辑 - 解决方案

我现在基于@Chris解决方案获得了修复。我有这样的事情：

module Features
  FEATURES = %w(running walking)

  # include Features::Running
  FEATURES.each do |feature|
    send :include, "Features::#{feature.camelize}".constantize
  end

  module ClassMethods
    # include Features::Running::ClassMethods
    FEATURES.each do |feature|
      send :include, "Features::#{feature.camelize}::ClassMethods".constantize
    end
  end

  def self.included(base)
    base.send :extend, ClassMethods
  end
end

现在我的其他功能模块：

# lib/features/running.rb
module Features::Running
  module ClassMethods
    def can_run
      ...
    end
  end
end

# lib/features/walking.rb
module Features::Walking
  module ClassMethods
    def can_walk
      ...
    end
  end
end

修改 - 更新解决方案

module Features
  FEATURES = [Running, Walking]

  # include Features::Running
  FEATURES.each do |feature|
    send :include, feature
  end

  module ClassMethods
    # include Features::Running::ClassMethods
    FEATURES.each do |feature|
      send :include, feature::ClassMethods
    end
  end

  def self.included(base)
    base.send :extend, ClassMethods
  end
end

Answer 1

你可以;您可能遇到的问题是ActiveSupport::Concern自动将ClassMethods中的方法扩展到目标类，而不是将多个ClassMethods子模块合并为一个。不幸的是，由于Ruby的循环包含防止代码，这有点难以自动完成，但实际上你可以在没有AS :: Concern的情况下手动完成。

module Foo
  def foo
  end

  module ClassMethods
    def cfoo
    end
  end
end

module Baz
  def baz
  end

  module ClassMethods
    def cbaz
    end
  end
end

module Bar
  include Baz
  def bar
  end

  module ClassMethods
    include Baz::ClassMethods
    def cbar
    end
  end
end

module Stuff
  include Foo
  include Bar

  module ClassMethods
    include Foo::ClassMethods
    include Bar::ClassMethods
  end
end

class Final
  include Stuff
  extend Stuff::ClassMethods
end

这有点冗长，但是您可以根据需要编写碎片，但是必须小心始终包含父模块，然后将ClassMethods包含到相应的ClassMethods子模块中。

ruby / rails：扩展或包含其他模块

1 个答案: