Doctrine2 Migration - single table inheritance - parent id does not exist

Question

I do not get simple table inheritance to work on my blog.

Here is what I have:

3 simple classes

• General abstract comment class
• Subclass for comments made to blog posts with a foreign key, to one
• Subclass for comments about actions also with a foreign key

General comment structure

/**
 * @ORM\MappedSuperClass
 * @ORM\Entity(repositoryClass="MY\BlogBundle\Entity\Repository\CommentRepository")
 * @ORM\Table(name="blog_comment")
 * @ORM\InheritanceType("SINGLE_TABLE")
 * @ORM\DiscriminatorColumn(name="type", type="string")
 * @ORM\DiscriminatorMap( {"blogentry" = "BlogComment", "activity" = "ActivityComment"} )
 * @ORM\HasLifecycleCallbacks
 */
abstract class Comment
{
    /**
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @ORM\Column(name="title", type="string", length=255, nullable=true)
     * @Assert\NotBlank()
     */
    private $title;
    ...

Blog commentary

/**
 * BlogEntryComment
 * @ORM\Entity(repositoryClass="MY\BlogBundle\Entity\Repository\BlogEntryCommentRepository")
 */
class BlogComment extends Comment
{

/**
 * @ORM\ManyToOne(targetEntity="MY\BlogBundle\Entity\BlogEntry", inversedBy="comments")
 * @ORM\JoinColumn(name="blog_entry_id", referencedColumnName="id", onDelete="CASCADE", nullable=true)
 */
 private $blogEntry;
 ...

Commentary on the action

/**
 * @ORM\Entity(repositoryClass="MY\BlogBundle\Entity\Repository\ActivityCommentRepository")
 */
class ActivityComment extends Comment
{
/**
 * @ORM\ManyToOne(targetEntity="MY\BlogBundle\Entity\Activity", inversedBy="comments")
 * @ORM\JoinColumn(name="activity_id", referencedColumnName="id", onDelete="CASCADE", nullable=true)
 */
 private $activity;
 ...

Building all objects with

./app/console doctrine:generate:entities MY

works fine, this means that superclass methods, such as getId(), will be automatically inserted into the class Comment.

And the only functions inside the subclasses are setter and getter for their own properties, such as getBlogEntry()orgetActivity()

, :

    ./app/console doctrine:migrations:diff -vvv                                                        

  [ReflectionException]                                                    
  Property MY\BlogBundle\Entity\ActivityComment::$id does not exist  

Exception trace:
 () at MY_PATH/vendor/doctrine/common/lib/Doctrine/Common/Persistence/Mapping/RuntimeReflectionService.php:79
 ReflectionProperty->__construct() at MY_PATH/vendor/doctrine/common/lib/Doctrine/Common/Persistence/Mapping/RuntimeReflectionService.php:79
 Doctrine\Common\Persistence\Mapping\RuntimeReflectionService->getAccessibleProperty() at MY_PATH/vendor/doctrine/orm/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php:889
 Doctrine\ORM\Mapping\ClassMetadataInfo->wakeupReflection() at MY_PATH/vendor/doctrine/orm/lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php:537
 Doctrine\ORM\Mapping\ClassMetadataFactory->wakeupReflection() at MY_PATH/vendor/doctrine/common/lib/Doctrine/Common/Persistence/Mapping/AbstractClassMetadataFactory.php:209
 Doctrine\Common\Persistence\Mapping\AbstractClassMetadataFactory->getMetadataFor() at MY_PATH/vendor/doctrine/common/lib/Doctrine/Common/Persistence/Mapping/AbstractClassMetadataFactory.php:114
 Doctrine\Common\Persistence\Mapping\AbstractClassMetadataFactory->getAllMetadata() at MY_PATH/vendor/doctrine/migrations/lib/Doctrine/DBAL/Migrations/Tools/Console/Command/DiffCommand.php:68
 Doctrine\DBAL\Migrations\Tools\Console\Command\DiffCommand->execute() at MY_PATH/vendor/doctrine/doctrine-migrations-bundle/Doctrine/Bundle/MigrationsBundle/Command/MigrationsDiffDoctrineCommand.php:49
 Doctrine\Bundle\MigrationsBundle\Command\MigrationsDiffDoctrineCommand->execute() at MY_PATH/vendor/symfony/console/Symfony/Component/Console/Command/Command.php:252
 Symfony\Component\Console\Command\Command->run() at MY_PATH/vendor/symfony/console/Symfony/Component/Console/Application.php:900
 Symfony\Component\Console\Application->doRunCommand() at MY_PATH/vendor/symfony/console/Symfony/Component/Console/Application.php:192
 Symfony\Component\Console\Application->doRun() at MY_PATH/vendor/symfony/symfony/src/Symfony/Bundle/FrameworkBundle/Console/Application.php:96
 Symfony\Bundle\FrameworkBundle\Console\Application->doRun() at MY_PATH/vendor/symfony/console/Symfony/Component/Console/Application.php:123
 Symfony\Component\Console\Application->run() at MY_PATH/app/console:22

id .

. $id public protected, ./app/console doctrine:generate:entities MY

, , . :

• /
• @ORM\Table(name="blog_comment")
• .

- , . .

Answer 1

, , $id protected . .

Doctrine private $id , true. mongodb . , , .

, doctrine generate:entities.