如何初始化一个轨宝石里面加协会用户指定车型 [英] how to initialise a rails gem which add associations to models specified by user

问题描述

我在创建一个需要协会添加到用户定义某些型号宝石的过程。

I am in the process of creating a gem which needs to add associations to some models defined by the user.

我也可以复制到由轨生成器命令的应用程序的初始化器文件，这是用户将指定机型加协会。

I have an initialiser file which can be copied into the app by a rails generator command and this is where the user will specify the models to add the associations to.

BloggyGem.setup do |config|
  config.user = User
  config.post = Post
end

宝石里面，我有这样的规定。

Inside the Gem, I have this specified

 opts = BloggyGem.settings
 opts.user.has_many opts.post.to_s.downcase.pluralize.to_sym, 
                   :class_name => opts.post.model_name

 opts.post.belongs_to opts.user.to_s.downcase.singularize.to_sym,
                      :class_name => opts.user.model_name

我的测试都通过我的宝石，但铁轨初始化稍有不同于是就想一定要做到这一点的最好办法。

My tests are passing in my gem, but rails initialises slightly differently so wanted to be sure of the best way to do it.

推荐答案

也许你可以看看的的Rails :: Railtie

当我写我的宝石之一，我需要等到我的Rails应用程序的所有车型初始化我的宝石之前加载。我想这也是您的需要。我做了这样的事情：

When I wrote one of mine gems, I needed to wait until all the models in my Rails app were loaded before initializing my gem. I guess it's also your need. I did something like this:

module GemName
  class Railtie < Rails::Railtie

    config.after_initialize do
      class ActiveRecord::Base
        include GemName::ModelAdditions
        globalize
      end
    end
  end
end

的 config.after_initialize 回调为我工作得很好！

The config.after_initialize callback worked fine for me!

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