Override association mapping of a trait property in Doctrine 2.6

Prerequisites:

PHP 7.1.8

Symfony 3.3.9

Doctrine 2.6.x-dev

I wonder if it's possible to override an inversedBy attribute of a property association mapping that's taken from a trait.

An interface that I use as a concrete user entity placeholder:

ReusableBundleModelEntrantInterface.php

interface EntrantInterface
{
    public function getEmail();

    public function getFirstName();

    public function getLastName();
}

The following architecture works just fine (need to create User entity that implements EntrantInterface and all other entities that are derived from these abstract classes in AppBundle ):

ReusableBundleEntityEntry.php

/**
 * @ORMMappedSuperclass
 */
abstract class Entry
{
    /**
     * @var EntrantInterface
     *
     * @ORMManyToOne(targetEntity="ReusableBundleModelEntrantInterface", inversedBy="entries")
     * @ORMJoinColumn(name="user_id")
     */
    protected $user;

    // getters/setters...
}

ReusableBundleEntityTimestamp.php

/**
 * @ORMMappedSuperclass
 */
abstract class Timestamp
{
    /**
     * @var EntrantInterface
     *
     * @ORMManyToOne(targetEntity="ReusableBundleModelEntrantInterface", inversedBy="timestamps")
     * @ORMJoinColumn(name="user_id")
     */
    protected $user;

    // getters/setters...
}

And couple more entities with similar structure that utilize EntranInterface

And this is what I want to achieve - UserAwareTrait to be reusable across several entities:

ReusableBundleEntityTraitsUserAwareTrait.php

trait UserAwareTrait
{
    /**
     * @var EntrantInterface
     *
     * @ORMManyToOne(targetEntity="ReusableBundleModelEntrantInterface")
     * @ORMJoinColumn(name="user_id")
     */
    protected $user;

    // getter/setter...
}

In Doctrine 2.6 if I would use super class and wanted to override its property I'd do this:

/**
 * @ORMMappedSuperclass
 * @ORMAssociationOverrides({
 *     @ORMAssociationOverride({name="property", inversedBy="entities"})
 * })
 */
abstract class Entity extends SuperEntity
{
    // code...
}

But if I want that Entity to use UserAwareTrait and override association mapping of a property...

/**
 * @ORMMappedSuperclass
 * @ORMAssociationOverrides({
 *     @ORMAssociationOverride({name="user", inversedBy="entries"})
 * })
 */
abstract class Entry
{
    use UserAwareTrait;
    // code...
}

... and run php bin/console doctrine:schema:validate I see this error in the console:

[DoctrineORMMappingMappingException]
Invalid field override named 'user' for class 'ReusableBundleEntityEntry'.

Is there a workaround that I could follow to achieve the desired result?

Use trait to store shared properties

Override assotiation mapping or (possibly) attributes mapping in the class that uses that trait

---

TL;DR You should change the access modificator from protected to private . Don't forget that you will not be able to directly manipulate the private property in a subclass and will need a getter.

The exception appears due to the bug (I believe, or a quirk of the behavior) in the AnnotationDriver .

foreach ($class->getProperties() as $property) {
    if ($metadata->isMappedSuperclass && ! $property->isPrivate()
        ||
        ...) {
        continue;
    }

It skips all non-private properties for MappedSuperclass letting them to compose metadata on the subclass parsing. But when it comes to overriding the driver tries to do it at a MappedSuperclass level, it doesn't remember that the property was skipped, fails to find it in the metadata and raise an exception.

I made a detailed explanation at the issue. You can find there also the link to the unit tests that highlight the case.

---

You'll have to try this in your own code to see, but it could be possible.

As an experiment, I overridden a trait in a class, then checked for the trait using class_uses() http://php.net/manual/en/function.class-uses.php

<?php

trait CanWhatever
{
    public function doStuff()
    {
        return 'result!';
    }
}

class X
{
    use CanWhatever;

    public function doStuff()
    {
        return 'overridden!';
    }
}

$x = new X();
echo $x->doStuff();
echo "n$x has ";
echo (class_uses($x, 'CanWhatever')) ? 'the trait' : 'no trait';

This outputs:

overridden! 
$x has the trait

Which you can see here https://3v4l.org/Vin2H

However, Doctrine Annotations may still pick up the DocBlock from the trait proper rather than the overridden method, which is why I can't give you a definitive answer. You just need to try it and see!

---

我有一个类似的问题，并通过覆盖它自己的属性来解决它：

use UserAwareTrait;
/**
 * @var EntrantInterface
 * @ORMManyToOne(targetEntity="ReusableBundleModelEntrantInterface"inversedBy="entries")
 */
protected $user;

链接地址: http://www.djcxy.com/p/69388.html

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