Question

I'd like to conditionally set require: in my Gemfile definition depending on the environment to work in conjunction with Bundler.require. E.g. i'd like pry to be available in all environments but only have require: true set in development and test. I'm currently doing something like this:

# make pry available for anyone who wants it
# but not automatically required
# e.g. in a console
gem 'pry', require: false

# automatically require pry
# for easy usage in tests
group :development, :test do
  gem 'pry', require: true
end

Which works but results in a nice warning regarding a duplicate gem definition:

Your Gemfile lists the gem pry (>= 0) more than once. You should probably keep only one of them. While it's not a problem now, it could cause errors if you change the version of just one of them later.

Alternately, I can try to do something like this:

gem 'pry', require: ENV["RACK_ENV"] != "production"

but that feels much less declarative (and a little gross).

Edit:

To clarify,

I want to be to have pry available via Bundler.require in the development and test environments
Be available in production (e.g. for use in a console) without being automatically required via Bundler.require

Answer 1

如果希望安装gem而不是“必需”，则使用:require => false。如果你不打算在生产中使用'pry'宝石，那么将它安装到生产中是没有意义的。

您可以通过显式指定gem来使gem可用于任何环境。例如。在开发和测试环境中使用pry

group :development, :test do
  gem 'pry'
end

希望，这有帮助！

Answer 2

对依赖项进行分组允许您对整个组执行操作。

group :development, :test do
  gem 'pry', require: true
end

上述代码本身仅在pry gem和development环境中需要test。不在生产中。因此，您不需要指定生产中不需要它。

如果你在gem文件中提到gem 'pry'而没有指定任何内容，那么在所有环境默认情况下都需要它。

如需了解更多信息，请参阅此链接：http://bundler.io/groups.html

发件人： The How and Why of Bundler Groups

指定组允许您执行两项操作。首先，你可以安装   Gemfile中的gem，减去特定的组。例如，Rails   把mysql和pg放在数据库组中，这样如果你只是在工作   在ActionPack上，你可以捆绑安装--without db并运行   ActionPack测试，无需担心获得宝石   安装。

其次，您可以列出要使用的自动查询的特定组   Bundler.require。默认情况下，Bundler.require需要所有的宝石   默认组（这是没有显式组的所有gem）。   你也可以说Bundler.require（：default，：another_group）要求   特定群体。

Answer 3

如果您在Bundler.require中添加了群组名称，那么也会加载宝石（明确指出require: false的除外）。

例如，拥有包含以下内容的Gemfile：

gem 'redis'

group :test do
  gem 'pry'
  gem 'simplecov', require: false
end

如果你Bundler.require redis只需要Bundler.require(:default, :test) 和，pry它将同时需要redis和simplecov };请注意，即使您明确指出:test群组，也不会要求simplecov。因此，要使用require 'simplecov'，您仍需要明确调用{{1}}

Conditionally setting require: true in Gemfile

Edit:

3 个答案: