Ruby Gem开发-如何使用ActiveRecord？ [英] Ruby Gem Development - How to use ActiveRecord?
问题描述
我目前正在尝试开发我的第一颗红宝石宝石，但已经被卡住了。我使用 bundle gem命令创建了基本结构，并阅读了一些教程，但我找不到如何集成ActiveRecord的方法。
I'm currently trying to develop my first ruby gem and I'm already stuck. I used the "bundle gem" command to create the basic structure and read some tutorials but what I can't find is how to integrate ActiveRecord.
在哪里创建我的
我是在lib文件夹中还是在根目录中创建 db / migrations文件夹？
Do I create the "db/migrations" folder within the lib folder or at the root?
我是否必须在Rakefile中做任何事情（我发现了一些问题，答案是您必须创建自己的[my_gem]：db：migrate之类的东西。）
And do I have to do anything in the Rakefile (I found some questions where the answer was something like "you have to create your own [my_gem]:db:migrate" or something like that.)
我所需要的就是创建一个gem的方法，该gem定义ActiveRecord模型（当然包括迁移），然后可以由rails应用程序使用。
All I need is a way to create a gem, which defines ActiveRecord models (including the migrations of course), which can then be used by a rails app.
对此的任何帮助将不胜感激！
Any help on that one would be greatly appreciated!
问候，弗洛尔
推荐答案
在构建与Rails项目集成的gem时，您需要构建Railtie引擎。如果您使用的是Rails 3.0.x，请使用 enginex ；如果您使用的是Rails 3.1，则应使用新生成器：
When building a gem to integrate with a rails project, you want to build a railtie engine. If you are using rails 3.0.x, use enginex, if you are using rails 3.1 you should be use the new generator:
rails g plugin new your-plugin-name
然后，在您的gem内，您只需在 app / models / 文件夹内定义模型，即可
Then, inside your gem, you can just define models, inside the app/models/ folder and they will automatically be picked up.
迁移会更加困难：对于rails 3.1，可以在正确的文件夹中定义它们，在rails 3.0中，您必须手动生成将迁移复制到代码库的任务。检查此链接我在其中回答了这个问题。
Migrations is somewhat harder: for rails 3.1 it is ok if you define them in the correct folder, in rails 3.0 you will have to manually generate a task to copy the migrations to your code-base. Check this link where I answered that very question.
For more information on rails engines check this and this article.
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