`require': 无法加载这样的文件 -- oj (LoadError)

Question

我只知道 Ruby 的基础知识并正在尝试修复此错误。已经有相同的问题，但无法从中解决。

当我运行在我的 Ruby 项目中执行命令时

rerun 'ruby app.rb'

我收到以下错误。

[rerun] Webhook-receiver launched

/Users/myhome/.rbenv/versions/2.4.2/lib/ruby/2.4.0/
rubygems/core_ext/kernel_require.rb:55:
in `require': cannot load such file -- oj (LoadError)

from  /Users/myhome/.rbenv/versions/2.4.2/lib/ruby/2.4.0/rubygems/
core_ext/kernel_require.rb:55:
in `require' from app.rb:2:in `<main>'

[rerun] Webhook-receiver Launch Failed
[rerun] Watching . for **/*.{rb,js,coffee,css,scss,sass,erb,html,haml,ru,yml,slim,md,feature}

我该如何解决这个问题？

Answer 1

只是想为其他人提供一个详细和结构化的答案，因为你已经解决了这个问题。在开发Ruby应用程序时，如果需要驻留在外部gem中的代码，您可以使用Bundler to keep track and manage your dependencies. It uses a file called Gemfile注册您的项目所依赖的依赖项，以及来源这些依赖项将被拉到您的机器上。 Gemfile 的基本语法示例。

# Registering the sources of gem packages
source 'https://rubygems.org'
[...]

# Requiring a gem for this project
gem 'package_1' # registers a dependency
gem 'package_2', '>=2.0.0' # registers a dependency, with minimum version required
gem 'package_3', '>= 1.5.0', '< 1.9.0' # registers a dependency, with minimum and maximum version required
[...]

完成所有这些设置后，当您运行 bundle install, the dependencies that are specified in your gemfile are pulled to your machine and you can run the program. If you want to check more information for a gem on your machine, you can run bundle info package（下面是 mysql gem 的示例）

  * mysql (2.9.1)
    Summary: This is the MySQL API module for Ruby
    Homepage: http://github.com/luislavena/mysql-gem
    Path: /var/lib/gems/2.3.0/gems/mysql-2.9.1

`require': 无法加载这样的文件 -- oj (LoadError)

`require': cannot load such file -- oj (LoadError)

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