Ruby-on-rails 当您的 Gemfile 需要旧版本的捆绑器时，如何“捆绑安装”？
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How to `bundle install` when your Gemfile requires an older version of bundler?
提问by Andrew
I am in an older Rails project that has a Gemfile. I tried to add a gem to the Gemfile and bundle installbut got an error:
我在一个有 Gemfile 的旧 Rails 项目中。我试图向 Gemfile 添加一个 gem，bundle install但出现错误：
Bundler could not find compatible versions for gem "bundler":
In Gemfile:
rails (= 3.0.0) ruby depends on
bundler (~> 1.0.0) ruby
Current Bundler version:
bundler (1.1.5)
This Gemfile requires a different version of Bundler.
The version of Rails it's using requires bundler ~>1.0.0 but I have 1.1.5 installed and am using it for my other projects. Usually I would use bundle exec ...but since this is bundler we are talking about, it's a little more complicated than that. How can I add a gem to my Gemfile and run bundle installwhile using the version of bundler that it requires?
它使用的 Rails 版本需要 bundler ~>1.0.0，但我安装了 1.1.5 并将它用于我的其他项目。通常我会使用，bundle exec ...但由于这是我们正在谈论的捆绑器，因此它比那要复杂一些。如何将 gem 添加到我的 Gemfile 并bundle install在使用它所需的捆绑程序版本时运行？
回答by alexsanford1
First you need to install the appropriate version of bundler:
首先你需要安装合适版本的bundler：
% gem install bundler -v '~> 1.0.0'
Successfully installed bundler-1.0.22
Then force rubygems to use the version you want (see this post):
然后强制 rubygems 使用你想要的版本（见这篇文章）：
% bundle _1.0.22_ install
回答by Asbj?rn Ulsberg
The error message In Gemfile: bundler (~> 1.16)is a bit inaccurate, since the version number requirement can come from other places, such as the .gemspecfile, which was the case for me:
错误信息In Gemfile: bundler (~> 1.16)有点不准确，因为版本号要求可能来自其他地方，例如.gemspec文件，我就是这种情况：
spec.add_development_dependency "bundler", "~> 1.16"
Removing the version number from the .gemspecfile solved the issue for me:
从.gemspec文件中删除版本号为我解决了这个问题：
spec.add_development_dependency "bundler"
回答by gsumk
I had the same issue on macOS Mojave. I installed the different version of the bundler gem and uninstall the current version.
我在 macOS Mojave 上遇到了同样的问题。我安装了不同版本的 bundler gem 并卸载了当前版本。
gem install bundler -i '2.0.1'
gem install bundler -i '2.0.1'
gem uninstall bundler
gem uninstall bundler
Then gives me the option to choose the version to uninstall and I choose the one which is creating the problem.
然后让我选择要卸载的版本，然后我选择导致问题的版本。
