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POSymfony2 / Doctrine mapped superclass in the middle of class table inheritance
 

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    <p>I currently have a model structure as follows:</p> <pre><code>/** * @ORM\Entity * @ORM\InheritanceType("JOINED") * @ORM\DiscriminatorColumn(name="related_type", type="string") * @ORM\DiscriminatorMap({"type_one"="TypeOne", "type_two"="TypeTwo"}) */ abstract class BaseEntity { ... (all the usual stuff, IDs, etc) /** * @ORM\OneToMany(targetEntity="Comment", mappedBy="baseEntity") */ private $comments; } /** * @ORM\Entity */ class TypeOne extends BaseEntity { /** * @ORM\Column(type="string") */ private $name; /** * @ORM\Column(type="string") */ private $description; } /** * @ORM\Entity */ class TypeTwo extends BaseEntity { /** * @ORM\Column(type="string") */ private $name; /** * @ORM\Column(type="string") */ private $description; } /** * @ORM\Entity */ class Comment { ... (all the usual stuff, IDs, etc) /** * @ORM\ManyToOne(targetEntity="BaseEntity", inversedBy="comments") */ private $baseEntity; } </code></pre> <p>The idea here is to be able to tie a comment to any of the other tables. This all seems to be working ok so far (granted, I'm still exploring design options so there could be a better way to do this...), but the one thing I've noticed is that the subclasses have some common fields that I'd like to move into a common parent class. I don't want to move them up into the BaseEntity as there will be other objects that are children of BaseEntity, but that won't have those fields.</p> <p>I've considered creating a MappedSuperclass parent class in the middle, like so:</p> <pre><code>/** * @ORM\MappedSuperclass */ abstract class Common extends BaseEntity { /** * @ORM\Column(type="string") */ private $name; /** * @ORM\Column(type="string") */ private $description; } /** * @ORM\Entity */ class TypeOne extends Common {} /** * @ORM\Entity */ class TypeTwo extends Common {} </code></pre> <p>I figured this would work, but the doctrine database schema generator is complaining that I can't have a OneToMany mapping on a MappedSuperclass. I didn't expect this to be a problem as the OneToMany mapping is still between the root BaseEntity and the Comment table. Is there a different structure I should be using, or other way to make these fields common without adding them on the BaseEntity?</p>
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