Rails - Aug 2006 - How to access records from multiple tables

Hi iam a newbie and i just wanna know to how to access data from 
multiple tables in a database in RoR? I have gone through the tutorial 
"Rolling on Ruby on Rails" on Onlamp but i get an error when i try to 
access data from two tables?

similary, how can i update data in to multiple tables?


Thanks in Advance

Sathya

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