Rails - Jan 2011 - NoMethodError: undefined method `more_results' for #<Mysql>

I am trying to create rake task to import data from my old php 
application.But I can not connect to mysql database properly, when I run 
Old::User.all on rails console ,I get this error :

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


Model class Old/user.rb

    class Old::User < ActiveRecord::Base
      establish_connection "old_database"
      
      # Because table name is lowercase
      def self.table_name() 
       "user"
      end
    end

database.yml

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

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