title: Symfony is-a database schema
body: <p>So I am new to symfony and am trying to make a is-a relationship between several tables. I have a media table that has a id field that is the primary key. I then except to have 2 or more additional tables that are "subclasses" of this table such as an article or event table. These are subclasses of the media table and I put a media_id field in these tables that have FK constraints with the media table and are primary keys of the specific tables. However when I build the module based off of this model, this relationship does not hold. </p>
  
  <p>For example, when I try adding an article, I have to add a media item first, but then in the create article form, there is no way to add a media id to it. </p>
  
  <p>Any ideas?</p>
  
  <p>Thanks!</p>