symfony
diff --git a/‎src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php
Copy file name to clipboardExpand all lines: src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php
+14-10Lines changed: 14 additions & 10 deletions b/‎src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php
Copy file name to clipboardExpand all lines: src/Symfony/Bridge/Doctrine/PropertyInfo/DoctrineExtractor.php
+14-10Lines changed: 14 additions & 10 deletions
diff --git a/‎src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/DoctrineExtractorTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/DoctrineExtractorTest.php
+8Lines changed: 8 additions & 0 deletions b/‎src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/DoctrineExtractorTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/DoctrineExtractorTest.php
+8Lines changed: 8 additions & 0 deletions
diff --git a/‎src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineDummy.php
Copy file name to clipboardExpand all lines: src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineDummy.php
+5Lines changed: 5 additions & 0 deletions b/‎src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineDummy.php
Copy file name to clipboardExpand all lines: src/Symfony/Bridge/Doctrine/Tests/PropertyInfo/Fixtures/DoctrineDummy.php
+5Lines changed: 5 additions & 0 deletions
@@ -112,17 +112,21 @@ public function getTypes($class, $property, array $context = [])
                 if (isset($associationMapping['indexBy'])) {
                     /** @var ClassMetadataInfo $subMetadata */
                     $subMetadata = $this->classMetadataFactory->getMetadataFor($associationMapping['targetEntity']);
-                    $fieldName = $subMetadata->getFieldForColumn($associationMapping['indexBy']);
-                    $typeOfField = $subMetadata->getTypeOfField($fieldName);
 
-                    // Maybe $fieldName is an association
-                    if (null === $typeOfField) {
-                        $associationMapping = $subMetadata->getAssociationMapping($fieldName);
-
-                        /** @var ClassMetadataInfo $subMetadata */
-                        $indexProperty = $subMetadata->getSingleAssociationReferencedJoinColumnName($fieldName);
-                        $subMetadata = $this->classMetadataFactory->getMetadataFor($associationMapping['targetEntity']);
-                        $typeOfField = $subMetadata->getTypeOfField($indexProperty);
+                    // Check if indexBy value is a property
+                    $fieldName = $associationMapping['indexBy'];
+                    if (null === ($typeOfField = $subMetadata->getTypeOfField($fieldName))) {
+                        $fieldName = $subMetadata->getFieldForColumn($associationMapping['indexBy']);
+                        //Not a property, maybe a column name?
+                        if (null === ($typeOfField = $subMetadata->getTypeOfField($fieldName))) {
+                            //Maybe the column name is the association join column?
+                            $associationMapping = $subMetadata->getAssociationMapping($fieldName);
+
+                            /** @var ClassMetadataInfo $subMetadata */
+                            $indexProperty = $subMetadata->getSingleAssociationReferencedJoinColumnName($fieldName);
+                            $subMetadata = $this->classMetadataFactory->getMetadataFor($associationMapping['targetEntity']);
+                            $typeOfField = $subMetadata->getTypeOfField($indexProperty);
+                        }
                     }
 
                     if (!$collectionKeyType = $this->getPhpType($typeOfField)) {
 
@@ -152,6 +152,14 @@ public function typesProvider()
                 new Type(Type::BUILTIN_TYPE_INT),
                 new Type(Type::BUILTIN_TYPE_OBJECT, false, 'Symfony\Bridge\Doctrine\Tests\PropertyInfo\Fixtures\DoctrineRelation')
             )]],
+            ['indexedRguid', [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')
+            )]],
             ['indexedBar', [new Type(
                 Type::BUILTIN_TYPE_OBJECT,
                 false,
 
@@ -41,6 +41,11 @@ class DoctrineDummy
      */
     public $bar;
 
+    /**
+     * @ManyToMany(targetEntity="DoctrineRelation", indexBy="rguid")
+     */
+    protected $indexedRguid;
+
     /**
      * @ManyToMany(targetEntity="DoctrineRelation", indexBy="rguid_column")
      */