如何在rails应用程序中配置多个数据库源

Question

我想为某个环境（比如暂存或生产）配置2个数据库实例。默认rails新应用程序只提供单个数据库实例，如何配置2个数据库实例。

Answer 1

您可以复制并覆盖现有配置之一，例如开发。并根据需要重命名，在database.yml：

中

development:
  adapter: mysql2
  encoding: utf8
  reconnect: false
  database: 
  pool: 5
  username: root
  password: 
  host: localhost


new_database:
  adapter: mysql2
  encoding: utf8
  reconnect: false
  database: 
  pool: 5
  username: root
  password: 
  host: localhost

然后，在为此新连接创建的模型中，将以下方法添加到模型中，例如：

class Document < ActiveRecord::Base
  self.table_name = "document"   # this allows you to hide a non comforming table name behind the rails model it is NOT necessary for establish_connection to work
  self.establish_connection "new_database"  # notice there is no = when setting this value, strange, I know.
end