Ruby on rails Rails生成错误

每次我键入rails generate时都会出现此错误：

/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/mysql2-0.4.2/lib/mysql2.rb:31:in
`require':
dlopen(/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/mysql2-0.4.2/lib/mysql2/mysql2.bundle,
9): Library not loaded: libmysqlclient.18.dylib   Referenced from:
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/mysql2-0.4.2/lib/mysql2/mysql2.bundle
Reason: image not found -
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/mysql2-0.4.2/lib/mysql2/mysql2.bundle
(LoadError)   from
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/mysql2-0.4.2/lib/mysql2.rb:31:in
`<top (required)>'    from
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:77:in
`require'     from
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:77:in
`block (2 levels) in require'     from
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:72:in
`each'    from
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:72:in
`block in require'    from
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:61:in
`each'    from
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:61:in
`require'     from
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler.rb:99:in
`require'     from
/Users/hadifarhat/simple_cms/config/application.rb:7:in `<top
(required)>'  from
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/spring-1.6.1/lib/spring/application.rb:82:in
`require'     from
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/spring-1.6.1/lib/spring/application.rb:82:in
`preload'     from
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/spring-1.6.1/lib/spring/application.rb:143:in
`serve'   from
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/spring-1.6.1/lib/spring/application.rb:131:in
`block in run'    from
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/spring-1.6.1/lib/spring/application.rb:125:in
`loop'    from
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/spring-1.6.1/lib/spring/application.rb:125:in
`run'     from
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/spring-1.6.1/lib/spring/application/boot.rb:18:in
`<top (required)>'    from
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:55:in `require'  from
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:55:in `require'  from -e:1:in `<main>'

/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/mysql2-0.4.2/lib/mysql2.rb:31:in
`要求'：
dlopen（/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/mysql2-0.4.2/lib/mysql2/mysql2.bundle，
9） ：未加载库：libmysqlclient.18.dylib引用自：
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/mysql2-0.4.2/lib/mysql2/mysql2.bundle
原因：找不到图像-
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/mysql2-0.4.2/lib/mysql2/mysql2.bundle
（加载错误）来自
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/mysql2-0.4.2/lib/mysql2.rb:31:in
`“从
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:77:in
`要求
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:77:in
`“要求”中的块（2级）
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:72:in
`每一个都来自
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:72:in
`在“请求”中阻止
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:61:in
`每一个都来自
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:61:in
`要求
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler.rb:99:in
`要求
/Users/hadifarhat/simple\u cms/config/application.rb:7:in``来自
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/spring-1.6.1/lib/spring/application.rb:82:in
`要求
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/spring-1.6.1/lib/spring/application.rb:82:in
`预加载来自
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/spring-1.6.1/lib/spring/application.rb:143:in
`从
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/spring-1.6.1/lib/spring/application.rb:131:in
`“从”运行中的阻塞
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/spring-1.6.1/lib/spring/application.rb:125:in
`循环从
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/spring-1.6.1/lib/spring/application.rb:125:in
`逃离
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/spring-1.6.1/lib/spring/application/boot.rb:18:in
`“从
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/site\u ruby/2.2.0/rubygems/core\u ext/kernel\u require.rb:55:in'require'from
/Users/hadifarhat/.rbenv/versions/2.2.3/lib/ruby/site\u ruby/2.2.0/rubygems/core\u ext/kernel\u require.rb:55:in“require”from-e:1:in“require”

插入到您的GEM文件中

gem 'mysql2', '~> 0.3.18'

安装一些mysql2依赖项

sudo apt-get install libmysql-ruby libmysqlclient-dev

然后捆绑安装

bundle install

添加到您的文件中

gem 'mysql2' #For latest version 

然后更新你的包

bundle install 

然后将rails生成到ruby文件夹中

gem install rails

最终创建项目

rails new project #Project your project name 

---

希望将帮助您

看来您错过了mysql2 gem。在运行

railsgenerate

之前，请尝试

bundle安装。如果不起作用，请尝试
gem安装mysql2