Question

我是ruby on rails的新手我无法找到此错误的解决方案：

rails s

/usr/local/share/gems/gems/mysql2-0.3.13/lib/mysql2.rb:8:in `require': cannot load such file -- mysql2/mysql2 (LoadError)
from /usr/local/share/gems/gems/mysql2-0.3.13/lib/mysql2.rb:8:in `<top (required)>'
from /usr/local/share/gems/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `require'
from /usr/local/share/gems/gems/bundler-1.3.5/lib/bundler/runtime.rb:72:in `block (2 levels) in require'
from /usr/local/share/gems/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `each'
from /usr/local/share/gems/gems/bundler-1.3.5/lib/bundler/runtime.rb:70:in `block in require'
from /usr/local/share/gems/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `each'
from /usr/local/share/gems/gems/bundler-1.3.5/lib/bundler/runtime.rb:59:in `require'
from /usr/local/share/gems/gems/bundler-1.3.5/lib/bundler.rb:132:in `require'
from /home/Harish/Documents/simple_cms/config/application.rb:7:in `<top (required)>'
from /usr/local/share/gems/gems/railties-4.0.0/lib/rails/commands.rb:76:in `require'
from /usr/local/share/gems/gems/railties-4.0.0/lib/rails/commands.rb:76:in `block in <top (required)>'
from /usr/local/share/gems/gems/railties-4.0.0/lib/rails/commands.rb:73:in `tap'
from /usr/local/share/gems/gems/railties-4.0.0/lib/rails/commands.rb:73:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'

Answer 1

gem uninstall mysql2

gem install mysql2 --platform=ruby

删除rails特定包目录中的mysql2 gem目录并复制粘贴这个新安装的mysql2 gem

Answer 2

对于Rails 3.2.17和Ruby 1.9.3-p448以及mysql2 0.3.11，运行bundle update mysql2更新为0.3.15并为我摆脱了错误。

Answer 3

Ya，正在使用带有rails 4.0.0的mysql2 gem的新版本（0.3.13）。删除供应商目录下的捆绑文件夹，并重新运行捆绑安装，更新为我解决了这个问题

cd {Your_RailsApp_Root}/vendor/
rm -rf bundle/
cd {Your_RailsApp_Root}
bundle install
bundle update

Answer 4

你是否安装了mysql2 gem？检查您的gemfile是否为gem "mysql2"，然后从rails应用程序的根目录运行bundle install。另外，请确保在开发环境中下载了mysql。

Answer 5

刚刚降级了mysql2版本。在我的情况下，我使用'0.2.6'版本，它适用于我。

  gem 'mysql2', '0.2.6'

使用ruby版本2.0.0和gem版本1.8.25

Answer 6

sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg -target /

来自 https://gorails.com/setup/osx/10.14-mojave

Answer 7

对我有用。

gem卸载mysql2
sudo gem安装mysql2
捆绑包

Answer 8

这解决了我的错误：

[root @ localhost cms] #su Harish

[Harish @ localhost cms] $ bundle install

[Harish @ localhost cms] $ rails s

rails无法加载此类文件 - mysql2 / mysql2（LoadError）

8 个答案: