Generate Symfony2 fixtures from DB?

There’s no direct manner within Doctrine or Symfony2, but writing a code generator for it (either within or outside of sf2) would be trivial. Just pull each property and generate a line of code to set each property, then put it in your fixture loading method. Example:

<?php
$i = 0;
$entities = $em->getRepository('MyApp:Entity')->findAll();
foreach($entities as $entity)
{
   $code .= "$entity_{$i} = new MyApp\Entity();\n";
   $code .= "$entity_{$i}->setMyProperty('" . addslashes($entity->getMyProperty()); . "'); \n");
   $code .= "$manager->persist($entity_{$i}); \n $manager->flush();";
   ++$i;
}
// store code somewhere with file_put_contents