NoMethodError：＃的未定义方法`more_results&#39; <Mysql>

Question

我正在尝试创建rake任务以从旧的php应用程序导入数据。但是，当我在rails控制台上运行Old :: User.all时，我无法正确连接到mysql数据库，出现此错误：

NoMethodError: undefined method `more_results' for #<Mysql>

        from /Library/Ruby/Gems/1.8/gems/activerecord-3.0.3/lib/active_record/connection_adapters/mysql_adapter.rb:623:in `select'
        from /Library/Ruby/Gems/1.8/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/database_statements.rb:7:in `select_all'
        from /Library/Ruby/Gems/1.8/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/query_cache.rb:56:in `select_all'
        from /Library/Ruby/Gems/1.8/gems/activerecord-3.0.3/lib/active_record/base.rb:467:in `find_by_sql'
        from /Library/Ruby/Gems/1.8/gems/activerecord-3.0.3/lib/active_record/relation.rb:64:in `to_a'
        from /Library/Ruby/Gems/1.8/gems/activerecord-3.0.3/lib/active_record/relation/finder_methods.rb:143:in `all'
        from /Library/Ruby/Gems/1.8/gems/activerecord-3.0.3/lib/active_record/base.rb:439:in `__send__'
        from /Library/Ruby/Gems/1.8/gems/activerecord-3.0.3/lib/active_record/base.rb:439:in `all'
        from (irb):1

模型类Old / user.rb

class Old::User < ActiveRecord::Base
  establish_connection "old_database"

  # Because table name is lowercase
  def self.table_name() 
    "user"
  end
end

数据库

old_database:
  adapter: mysql
  database: old_database
  username: root
  password: 
  socket: /Applications/MAMP/tmp/mysql/mysql.sock

Answer 1

最新的MySQL gem（=> 0.3.2）需要一个额外的gem进行连接-就像在Rails以前版本中的MSSQL-Server gem一样，它的架构也是如此。

您可能还想使用mysql2（请注意“ 2”）gem