以编程方式检查捆绑中的宝石？ [英] Programmatically check if gem in bundle?

问题描述

在运行时，捆绑器安装完成并应用组后，什么是以编程方式检查给定 gem_name 是否在捆绑包中的最佳方式？

通过阅读源代码，我发现了 Bundler.definition
$ p $ gem_name ='banana'
Bundler.definition.dependencies.map（$ c $ ），例如 &：name）.include？（gem_name）


但无法找到文档 ¹ ，我不知道这是否是推荐用法。

更新：它看起来像 Bundler :: Definition＃dependencies code>返回所有依赖关系，而不考虑组。作为替代，我发现了 Bundler :: Runtime＃dependencies_for ，它以组作为参数。

  Bundler.load.dependencies_for（：default，Rails.env）.map（&：name）.include？（gem_name）
  

然而，在每个呼叫站点复制组列表似乎不是个好主意。理想情况下，我希望 Bundler 中的方法不需要我指定当前组。 1 bundler网站和手册页主要关注命令行的使用。我还没有找到任何有关宝石公共ruby API的文档。在源代码中的注释是有帮助的，但是关注的是数据类型等。 解决方案 Bundler用于设置应用程序的宝石，所以你可以使用 Gem API而不是 Bundler ：

  Gem.loaded_specs.has_key？ gem_name 
  

Bundler会设置一些东西，以便捆绑中的任何宝石（在相应的组中）已被激活（所以它们将在 loaded_specs 中有条目），并且任何其他（非捆绑）gem都将被阻止加载。

At runtime, after bundler setup is complete, and groups are applied, what is the best way to programmatically check if a given gem_name is in the bundle?

By reading the source, I've discovered Bundler.definition, e.g.

gem_name = 'banana'
Bundler.definition.dependencies.map(&:name).include?(gem_name)

but unable to find documentation¹, I don't know if this is the recommended usage.

Update: It looks like Bundler::Definition#dependencies returns all dependencies, irrespective of groups. As an alternative, I've discovered Bundler::Runtime#dependencies_for which takes groups as arguments.

Bundler.load.dependencies_for(:default, Rails.env).map(&:name).include?(gem_name)

However, it seems like a bad idea to duplicate the "group lists" at every call site. Ideally, I'd like a method in Bundler that doesn't require me to specify the current groups.

_{1 The bundler website and man page are focused on command-line usage. I have not found any documentation on the gem's public ruby API. Comments in the source are helpful, but focused on data types, etc.}

解决方案

Bundler is used to set up the applications gems, so you can use the Gem API rather than Bundler:

Gem.loaded_specs.has_key? gem_name

Bundler will have set things up so that any gems in the bundle (in the appropriate groups) have been activated (so they will have entries in loaded_specs) and any other (non-bundle) gems will be prevented from being loaded.

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