Ruby on Rails在ubuntu上的Mysql

Question

我正在嘗試在Ubuntu環境中使用mysql數據庫在ruby上開發ruby。 我已經成功安裝了rails和mysql。 但是當我嘗試生成模型時，它會報告消息

 rails g model person
      invoke  active_record
/home/meuser/.rvm/gems/ruby-1.9.2-p320@global/gems/bundler-1.1.4/lib/bundler/rubygems_integration.rb:147:in `block in replace_gem': Please install the mysql adapter: `gem install activerecord-mysql-adapter` (mysql is not part of the bundle. Add it to Gemfile.) (LoadError)

然后我嘗試安裝activerecord-mysql-adapter：

meuser@ubuntu:~/myproject$ gem install activerecord-mysql-adapter
ERROR:  Could not find a valid gem 'activerecord-mysql-adapter' (>= 0) in any repository
ERROR:  Possible alternatives: activerecord-jdbcmysql-adapter, activerecord-jdbcmssql-adapter, activerecord-fb-adapter, activerecord-odbc-adapter, activerecord-jdbc-adapter
meuser@ubuntu:~/myproject$ 

由以下答案啟動，我也嘗試了以下方法：

meuser@ubuntu:~/myproject$ gem "mysql2", "< 0.3"
ERROR:  While executing gem ... (RuntimeError)
    Unknown command mysql2,
meuser@ubuntu:~/myproject$ 

和這個：

meuser@ubuntu:~/myproject$ gem 'mysql2'
ERROR:  While executing gem ... (RuntimeError)
    Unknown command mysql2
meuser@ubuntu:~/myproject$ 

和這個：

meuser@ubuntu:~/myproject$  gem install "mysql2" -v=2.8.17
ERROR:  Could not find a valid gem 'mysql2' (= 2.8.17) in any repository
ERROR:  Possible alternatives: mysql2
meuser@ubuntu:~/myproject$ 

和這個：

meuser@ubuntu:~/myproject$ sudo apt-get install libmysql-ruby libmysqlclient-dev
[sudo] password for meuser: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
libmysqlclient-dev is already the newest version.
libmysql-ruby is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
meuser@ubuntu:~/myproject$ gem "mysql2", "< 0.3"
ERROR:  While executing gem ... (RuntimeError)
    Unknown command mysql2,
meuser@ubuntu:~/myproject$ 

這是我的database.yml文件

development:
  adapter: mysql2
  encoding: utf8
  reconnect: false
  pool: 5
  database: myproject_db
  username: root
  password: somepassword
  host: localhost
  socket: /var/run/mysqld/mysqld.sock

有人知道這個問題的解決方案嗎？ 謝謝。

Answer 1

適配器gem稱為“ mysql2”，您需要將其添加到gemfile中：

gem 'mysql2'

然后運行bundle命令並編輯database.yml文件以指向正確的數據庫：

development:
  adapter: mysql2
  encoding: utf8
  reconnect: false
  database: yourapp_development
  pool: 5
  username: root
  password:
  socket: /var/run/mysqld/mysqld.sock

Answer 2

嘗試安裝版本低於0.3的mysql2 gem，例如0.2.8，這是常見問題。

在Gemfile類型

gem "mysql2", "< 0.3"