title: Symfony2 doctrine:schema:update keeps updating
body: <p>I've just added a new attribute in my model:</p>
  
  <pre><code>/**
  * @ORM\Column(name="has_donation", type="boolean", options ={"default":false})
  */
  private $hasDonation;
  </code></pre>
  
  <p>And then I tried running:</p>
  
  <pre><code>php app/console doctrine:schema:update --force 
  </code></pre>
  
  <p>which gave me the following result:</p>
  
  <pre><code>Updating database schema...
  Database schema updated successfully! "1" queries were executed
  </code></pre>
  
  <p>The problem is that each time I run the <code>schema:update</code> command, I get the same result - without making any changes to my entities. Any idea why? Thanks!</p>
  
  <p><strong>Update</strong>
  Here's the out for <code>php app/console doctrine:schema:update --dump-sql</code>:</p>
  
  <pre><code>ALTER TABLE Clinic CHANGE has_donation has_donation TINYINT(1) DEFAULT '0' NOT NULL;
  </code></pre>