mysql2红宝石2.3.1安装错误使用

我对Ruby不太熟悉。当我尝试在本地运行我的应用程序时，它应该运行良好，但事实并非如此。当我启动服务器mysql2红宝石2.3.1安装错误使用

rails s

它说

=> Booting Unicorn 
=> Rails 4.2.3 application starting in development on http://localhost:3000 
=> Run `rails server -h` for more startup options 
=> Ctrl-C to shutdown server 
Exiting 
/home/lukni/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/connection_specification.rb:177:in `rescue in spec': Specified 'mysql2' for database adapter, but the gem is not loaded. Add `gem 'mysql2'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord). (Gem::LoadError) 
    from /home/lukni/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/connection_specification.rb:174:in `spec' 
    from /home/lukni/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-4.2.3/lib/active_record/connection_handling.rb:50:in `establish_connection' 
    from /home/lukni/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-4.2.3/lib/active_record/railtie.rb:120:in `block (2 levels) in <class:Railtie>' 
    from /home/lukni/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-4.2.3/lib/active_support/lazy_load_hooks.rb:38:in `instance_eval' 
    from /home/lukni/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-4.2.3/lib/active_support/lazy_load_hooks.rb:38:in `execute_hook' 
    from /home/lukni/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-4.2.3/lib/active_support/lazy_load_hooks.rb:28:in `block in on_load'

我使用Ruby 2.3.1

我要发动我的地方我的应用程序。

来源

2017-05-25 Vendorpedia

在您的rails项目文件夹中，您应该有一个名为Gemfile的文件。根据此错误消息gem 'mysql2'：

所以，只需添加下面一行到这个文件中Add gem 'mysql2' to your Gemfile (and ensure its version is at the minimum required by ActiveRecord

补充说，像不要忘记通过bundle install命令更新你的宝石后。

如果您在安装宝石之后更好地完成所有必需步骤后仍然遇到问题，

来源

2017-05-25 06:38:56 DjezzzL

mysql2红宝石2.3.1安装错误使用

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