如何获取Rails 3应用程序中所有引擎的列表

发布于 2024-10-18 12:45:16 字数 598 浏览 1 评论 0 原文

根据 Rails 2.x 中的 Rails 引擎扩展功能，可以执行

Rails::Initializer.new(Rails.configuration).plugin_loader.engines

此代码无法在Rails 3

ActionController::RoutingError (undefined method `new' for Rails::Initializer:Module):
  config/application.rb:12:in `require_or_load'

我需要在 Rails 3 中做什么才能获得这样的引擎列表？

这是扩展 Rails 3 引擎的控制器所必需的主应用程序

原文

According to Rails engines extending functionality in Rails 2.x one could do

Rails::Initializer.new(Rails.configuration).plugin_loader.engines

This code is not working in Rails 3

ActionController::RoutingError (undefined method `new' for Rails::Initializer:Module):
  config/application.rb:12:in `require_or_load'

What do I need to do in Rails 3 to get such list of engines?

This is needed for Extending controllers of a Rails 3 Engine in the main app

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仅此而已 2024-10-25 12:45:16

Rails 4.1 改变了这一点。已接受的答案是弃用的，并获得了为Rails应用程序安装的引擎的新方法：

::Rails::Engine.subclasses.map(&:instance)

这是对 github 中的提交的引用进行更改（并且还显示了在最初弃用后它是如何实现的...）

如果您需要使用 Rails 4.1 中的先前解决方案：

module Rails
    class Engine
        class Railties
            def self.engines
                @engines ||= Rails::Engine.subclasses.map(&:instance)
            end
        end
    end
end

This has changed with Rails 4.1. The accepted answer is deprecated and the new way to get the installed Engines for a Rails application is now:

::Rails::Engine.subclasses.map(&:instance)

Here's a reference to the commit in github making the change (and also showing how it was implemented after initial deprecation...)

If you need to use the previous solution from Rails 4.1:

module Rails
    class Engine
        class Railties
            def self.engines
                @engines ||= Rails::Engine.subclasses.map(&:instance)
            end
        end
    end
end

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