What happen if your chief ask you to write an application that use more than one database? Wow… sound scaring, how to tell ActiveRecord that some models belong to a database and others to another? You’ll be surprised ‘cause it is quite easy.
http://www.railsonwave.it/railsonwave/2006/12/11/multiple-database-handlng-with-rails
http://www.robbyonrails.com/articles/2007/10/05/multiple-database-connections-in-ruby-on-rails
http://magicmodels.rubyforge.org/magic_multi_connections/
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