https://ruby-china.org/pengalg en-us <p>NameError: uninitialized constant Mysql2 </p> <p>在 database.yml 中，已经写了 </p> <p>development: adapter: mysql2 </p> <p>然后 Gemfile 中写的是 </p> <p>gem 'activerecord-jdbcmysql-adapter', :platform =&gt; :jruby </p> <p>查看 gemlist，上述 gem 是存在的，然后跟踪代码发现是 </p> <p>def retrieve_connection connection_handler.retrieve_connection(self) end </p> <p>这个里面跑出了 ConnectionNotEstablished 异常 </p> <p>本地命令 mysql -uroot -proot 正常 </p> pengalg Mon, 08 Dec 2014 16:56:56 +0800 https://ruby-china.org/topics/23087 https://ruby-china.org/topics/23087 <p>it 'go to home' do visit '/' expect( page).to have_css('.active a',:text=&gt;'Home') end </p> <ul> <li class="active"><a>Home</a></li> </ul> <p>错在哪里呢？ </p> pengalg Thu, 04 Dec 2014 22:24:47 +0800 https://ruby-china.org/topics/23032 https://ruby-china.org/topics/23032