title: Symfony : What is the meaning of auto_mapping and auto_generate_proxy_classes
body: <p>The configuration uses :</p>
  <pre><code>doctrine:
  dbal:
    driver:   &quot;%database_driver%&quot;
     ....
  orm:
      auto_generate_proxy_classes: &quot;%kernel.debug%&quot;
      auto_mapping: true
  </code></pre>
  <p>What is the exact meaning of <code>auto_mapping</code>? It is used in tons of examples with true and false, and no precise description.
  When does occurs the proxy generation if it's not auto ? By doctrine command-line tools ?</p>