bug #25841 [DoctrineBridge] Fix bug when indexBy is meta key in PropertyInfo\DoctrineExtractor (insekticid)

This PR was submitted for the 3.4 branch but it was merged into the 2.8 branch instead (closes #25841).

Discussion
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[DoctrineBridge] Fix bug when indexBy is meta key in PropertyInfo\DoctrineExtractor

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no <!-- don't forget to update UPGRADE-*.md files -->
| Tests pass?   | yes
| Fixed tickets | #25834 <!-- #-prefixed issue number(s), if any -->
| License       | MIT

@dunglas could you check it?
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Commits
-------

583759f PropertyInfo\DoctrineExtractor - There is bug when indexBy is meta key

src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php

@@ -95,9 +95,19 @@ class DoctrineExtractor implements PropertyListExtractorInterface, PropertyTypeE
 
                 if (isset($associationMapping['indexBy'])) {
                     $indexProperty = $associationMapping['indexBy'];
+                    /** @var ClassMetadataInfo $subMetadata */
                     $subMetadata = $this->classMetadataFactory->getMetadataFor($associationMapping['targetEntity']);
                     $typeOfField = $subMetadata->getTypeOfField($indexProperty);
 
+                    if (null === $typeOfField) {
+                        $associationMapping = $subMetadata->getAssociationMapping($indexProperty);
+
+                        /** @var ClassMetadataInfo $subMetadata */
+                        $indexProperty = $subMetadata->getSingleAssociationReferencedJoinColumnName($indexProperty);
+                        $subMetadata = $this->classMetadataFactory->getMetadataFor($associationMapping['targetEntity']);
+                        $typeOfField = $subMetadata->getTypeOfField($indexProperty);
+                    }
+
                     $collectionKeyType = $this->getPhpType($typeOfField);
                 }
             }

src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/DoctrineExtractorTest.php

@@ -59,6 +59,7 @@ class DoctrineExtractorTest extends TestCase
                 'foo',
                 'bar',
                 'indexedBar',
+                'indexedFoo',
             ),
             $this->extractor->getProperties('Symfony\Bridge\Doctrine\Tests\PropertyInfo\Fixtures\DoctrineDummy')
         );
@@ -136,6 +137,14 @@ class DoctrineExtractorTest extends TestCase
                 new Type(Type::BUILTIN_TYPE_STRING),
                 new Type(Type::BUILTIN_TYPE_OBJECT, false, 'Symfony\Bridge\Doctrine\Tests\PropertyInfo\Fixtures\DoctrineRelation')
             ))),
+            array('indexedFoo', array(new Type(
+                Type::BUILTIN_TYPE_OBJECT,
+                false,
+                'Doctrine\Common\Collections\Collection',
+                true,
+                new Type(Type::BUILTIN_TYPE_STRING),
+                new Type(Type::BUILTIN_TYPE_OBJECT, false, 'Symfony\Bridge\Doctrine\Tests\PropertyInfo\Fixtures\DoctrineRelation')
+            ))),
             array('simpleArray', array(new Type(Type::BUILTIN_TYPE_ARRAY, false, null, true, new Type(Type::BUILTIN_TYPE_INT), new Type(Type::BUILTIN_TYPE_STRING)))),
             array('customFoo', null),
             array('notMapped', null),

src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineDummy.php

@@ -14,6 +14,7 @@ namespace Symfony\Bridge\Doctrine\Tests\PropertyInfo\Fixtures;
 use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\Entity;
 use Doctrine\ORM\Mapping\Id;
+use Doctrine\ORM\Mapping\OneToMany;
 use Doctrine\ORM\Mapping\ManyToMany;
 use Doctrine\ORM\Mapping\ManyToOne;
 
@@ -45,6 +46,11 @@ class DoctrineDummy
      */
     protected $indexedBar;
 
+    /**
+     * @OneToMany(targetEntity="DoctrineRelation", mappedBy="foo", indexBy="foo")
+     */
+    protected $indexedFoo;
+
     /**
      * @Column(type="guid")
      */

src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineRelation.php

@@ -14,6 +14,7 @@ namespace Symfony\Bridge\Doctrine\Tests\PropertyInfo\Fixtures;
 use Doctrine\ORM\Mapping\Column;
 use Doctrine\ORM\Mapping\Entity;
 use Doctrine\ORM\Mapping\Id;
+use Doctrine\ORM\Mapping\ManyToOne;
 
 /**
  * @Entity
@@ -32,4 +33,10 @@ class DoctrineRelation
      * @Column(type="guid")
      */
     protected $rguid;
+
+    /**
+     * @Column(type="guid")
+     * @ManyToOne(targetEntity="DoctrineDummy", inversedBy="indexedFoo")
+     */
+    protected $foo;
 }