title: In Symfony2, what folder do I save a multi entity class in?
body: <p>I am new to Symfony2 and I am not sure where I should save a class that updated multiple tables(entities).</p>
  
  <p>From reading documentation and tutorials it says I should not put any other tables reference within the entity class; I could put it within the controller class, but again many people have said this class should be as simple as possible and not include business logic; Not in repositories, because these are used for query data and not for update or inserting.</p>
  
  <p>Is there a standard folder structure where another type of class for working with multiple entities(tables) should be saved? Should the business logic really be stored in the controller classes?</p>