title: Magento - Custom model one to many relationship
body: <p>I'm writing a custom module for Magento and I need to implement a one-to-many relationship between two tables.</p>
  
  <p>The easyest solution is to create one model for each table and save data separately, but I think this approach has some limitations (I prefer saving data in one single transaction instead of two, I want to load the combined data when I load the collection, ecc).</p>
  
  <p>What is the best way to handle this kind of situation? Is it possible to have one model class that retrieves data from multiple tables?</p>
  
  <p>Thank you</p>