如何使用ActiveSupport :: Configurable与Rails引擎 [英] How to use ActiveSupport::Configurable with Rails Engine

问题描述

我想给我的 rails engine gem 一个正确的配置可能性。
在 initializers / my_gem.rb中看起来像这样的东西 （链接到当前初始化程序）：

I want to give my rails engine gem a proper configuration possibilities. Something that looks like this in initializers/my_gem.rb (link to the current initializer):

MyGem.configure do |config|
  config.awesome_var = true
  # config.param_name = :page
end

$ b b

所以我一直在寻找其他宝石中的任何线索，最好的云发现是这 kaminari / config.rb 。
但是它看起来很黑，我认为一定有更好的方法。

So I've looked around for any clues in other gems and the best I cloud find was this kaminari/config.rb. But it looks so hacky that I think there must be a better way.

推荐答案

ActiveSupport :: Configurable 获得体面的文档：
https://github.com/rails/rails/blob/master/activesupport/lib/active_support/configurable.rb

我喜欢把配置放在引擎内的类中（比如kaminari）：

I like to put the configuration into it's own class within the engine (like kaminari does):

class MyGem
  def self.configuration
    @configuration ||= Configuration.new
  end

  def self.configure
    yield configuration
  end
end

class MyGem::Configuration
  include ActiveSupport::Configurable

  config_accessor(:foo) { "use a block to set default value" }
  config_accessor(:bar) # no default (nil)
end

请使用此API配置引擎：

Now I can configure the engine with this API:

MyGem.configure do |config|
  config.bar = 'baz'
end

MyGem.configuration.bar

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