Add generic reference as replacement for DBRef

docs/en/reference/annotations-reference.rst

@@ -1218,24 +1218,26 @@ documents.
 Optional attributes:
 
 -
-    targetDocument - A |FQCN| of the target document.
+    targetDocument - A |FQCN| of the target document. A ``targetDocument`` is
+    required when using ``storeAs: id``.
 -
     simple - deprecated (use ``storeAs: id``)
 -
-    storeAs - Indicates how to store the reference. ``id`` uses ``MongoId``,
-    ``dbRef`` uses a `DBRef`_ without ``$db`` value and ``dbRefWithDb`` stores
-    a full `DBRef`_ (``$ref``, ``$id``, and ``$db``). Note that ``id``
-    references are not compatible with the discriminators.
+    storeAs - Indicates how to store the reference. ``id`` stores the identifier,
+    ``ref`` an embedded object containing the ``id`` field and (optionally) a
+    discriminator. ``dbRef`` and ``dbRefWithDb`` store a `DBRef`_ object and
+    are deprecated in favor of ``ref``. Note that ``id`` references are not
+    compatible with the discriminators.
 -
     cascade - Cascade Option
 -
     discriminatorField - The field name to store the discriminator value within
-    the `DBRef`_ object.
+    the reference object.
 -
     discriminatorMap - Map of discriminator values to class names.
 -
     defaultDiscriminatorValue - A default value for discriminatorField if no value
-    has been set in the embedded document.
+    has been set in the referenced document.
 -
     inversedBy - The field name of the inverse side. Only allowed on owning side.
 -
@@ -1292,24 +1294,26 @@ Defines an instance variable holds a related document instance.
 Optional attributes:
 
 -
-    targetDocument - A |FQCN| of the target document.
+    targetDocument - A |FQCN| of the target document. A ``targetDocument`` is
+    required when using ``storeAs: id``.
 -
     simple - deprecated (use ``storeAs: id``)
 -
-    storeAs - Indicates how to store the reference. ``id`` uses ``MongoId``,
-    ``dbRef`` uses a `DBRef`_ without ``$db`` value and ``dbRefWithDb`` stores
-    a full `DBRef`_ (``$ref``, ``$id``, and ``$db``). Note that ``id``
-    references are not compatible with the discriminators.
+    storeAs - Indicates how to store the reference. ``id`` stores the identifier,
+    ``ref`` an embedded object containing the ``id`` field and (optionally) a
+    discriminator. ``dbRef`` and ``dbRefWithDb`` store a `DBRef`_ object and
+    are deprecated in favor of ``ref``. Note that ``id`` references are not
+    compatible with the discriminators.
 -
     cascade - Cascade Option
 -
     discriminatorField - The field name to store the discriminator value within
-    the `DBRef`_ object.
+    the reference object.
 -
     discriminatorMap - Map of discriminator values to class names.
 -
     defaultDiscriminatorValue - A default value for discriminatorField if no value
-    has been set in the embedded document.
+    has been set in the referenced document.
 -
     inversedBy - The field name of the inverse side. Only allowed on owning side.
 -

docs/en/reference/reference-mapping.rst

@@ -356,11 +356,12 @@ fields and as ``MongoId``, it is possible to save references as `DBRef`_ without
 the ``$db`` field. This solves problems when the database name changes (and also
 reduces the amount of storage used).
 
-The ``storeAs`` option has three possible values:
+The ``storeAs`` option has the following possible values:
 
 - **dbRefWithDb**: Uses a `DBRef`_ with ``$ref``, ``$id``, and ``$db`` fields (this is the default)
 - **dbRef**: Uses a `DBRef`_ with ``$ref`` and ``$id``
-- **id**: Uses a ``MongoId``
+- **ref**: Uses a custom embedded object with an ``id`` field
+- **id**: Uses the identifier of the referenced object
 
 .. note::
 

doctrine-mongo-mapping.xsd

@@ -124,6 +124,7 @@
   <xs:simpleType name="reference-store-as">
     <xs:restriction base="xs:token">
       <xs:enumeration value="id"/>
+      <xs:enumeration value="ref"/>
       <xs:enumeration value="dbRef"/>
       <xs:enumeration value="dbRefWithDb"/>
     </xs:restriction>

lib/Doctrine/ODM/MongoDB/Aggregation/Stage/Lookup.php

@@ -96,26 +96,38 @@ private function fromReference($fieldName)
         parent::from($targetMapping->getCollection());
 
         if ($referenceMapping['isOwningSide']) {
-            if ($referenceMapping['storeAs'] !== ClassMetadataInfo::REFERENCE_STORE_AS_ID) {
-                throw MappingException::cannotLookupNonIdReference($this->class->name, $fieldName);
+            switch ($referenceMapping['storeAs']) {
+                case ClassMetadataInfo::REFERENCE_STORE_AS_ID:
+                case ClassMetadataInfo::REFERENCE_STORE_AS_REF:
+                    $referencedFieldName = ClassMetadataInfo::getReferenceFieldName($referenceMapping['storeAs'], $referenceMapping['name']);
+                    break;
+
+                default:
+                   throw MappingException::cannotLookupNonIdReference($this->class->name, $fieldName);
             }
 
             $this
                 ->foreignField('_id')
-                ->localField($referenceMapping['name']);
+                ->localField($referencedFieldName);
         } else {
             if (isset($referenceMapping['repositoryMethod'])) {
                 throw MappingException::repositoryMethodLookupNotAllowed($this->class->name, $fieldName);
             }
 
             $mappedByMapping = $targetMapping->getFieldMapping($referenceMapping['mappedBy']);
-            if ($mappedByMapping['storeAs'] !== ClassMetadataInfo::REFERENCE_STORE_AS_ID) {
-                throw MappingException::cannotLookupNonIdReference($this->class->name, $fieldName);
+            switch ($mappedByMapping['storeAs']) {
+                case ClassMetadataInfo::REFERENCE_STORE_AS_ID:
+                case ClassMetadataInfo::REFERENCE_STORE_AS_REF:
+                    $referencedFieldName = ClassMetadataInfo::getReferenceFieldName($mappedByMapping['storeAs'], $mappedByMapping['name']);
+                    break;
+
+                default:
+                    throw MappingException::cannotLookupNonIdReference($this->class->name, $fieldName);
             }
 
             $this
                 ->localField('_id')
-                ->foreignField($mappedByMapping['name']);
+                ->foreignField($referencedFieldName);
         }
 
         return $this;

lib/Doctrine/ODM/MongoDB/DocumentManager.php

@@ -668,15 +668,15 @@ public function getConfiguration()
     }
 
     /**
-     * Returns a DBRef array for the supplied document.
+     * Returns a reference to the supplied document.
      *
-     * @param mixed $document A document object
+     * @param object $document A document object
      * @param array $referenceMapping Mapping for the field that references the document
      *
      * @throws \InvalidArgumentException
-     * @return array A DBRef array
+     * @return mixed The reference for the document in question, according to the desired mapping
      */
-    public function createDBRef($document, array $referenceMapping = null)
+    public function createReference($document, array $referenceMapping)
     {
         if ( ! is_object($document)) {
             throw new \InvalidArgumentException('Cannot create a DBRef, the document is not an object');
@@ -691,36 +691,54 @@ public function createDBRef($document, array $referenceMapping = null)
             );
         }
 
-        if ($referenceMapping['storeAs'] === ClassMetadataInfo::REFERENCE_STORE_AS_ID) {
-            if ($class->inheritanceType === ClassMetadataInfo::INHERITANCE_TYPE_SINGLE_COLLECTION) {
-                throw MappingException::simpleReferenceMustNotTargetDiscriminatedDocument($referenceMapping['targetDocument']);
-            }
-            return $class->getDatabaseIdentifierValue($id);
-        }
-
-        $dbRef = array(
-            '$ref' => $class->getCollection(),
-            '$id'  => $class->getDatabaseIdentifierValue($id),
-        );
-
-        if ($referenceMapping['storeAs'] === ClassMetadataInfo::REFERENCE_STORE_AS_DB_REF_WITH_DB) {
-            $dbRef['$db'] = $this->getDocumentDatabase($class->name)->getName();
+        $storeAs = isset($referenceMapping['storeAs']) ? $referenceMapping['storeAs'] : null;
+        switch ($storeAs) {
+            case ClassMetadataInfo::REFERENCE_STORE_AS_ID:
+                if ($class->inheritanceType === ClassMetadataInfo::INHERITANCE_TYPE_SINGLE_COLLECTION) {
+                    throw MappingException::simpleReferenceMustNotTargetDiscriminatedDocument($referenceMapping['targetDocument']);
+                }
+
+                return $class->getDatabaseIdentifierValue($id);
+                break;
+
+
+            case ClassMetadataInfo::REFERENCE_STORE_AS_REF:
+                $reference = ['id' => $class->getDatabaseIdentifierValue($id)];
+                break;
+
+            case ClassMetadataInfo::REFERENCE_STORE_AS_DB_REF:
+                $reference = [
+                    '$ref' => $class->getCollection(),
+                    '$id'  => $class->getDatabaseIdentifierValue($id),
+                ];
+                break;
+
+            case ClassMetadataInfo::REFERENCE_STORE_AS_DB_REF_WITH_DB:
+                $reference = [
+                    '$ref' => $class->getCollection(),
+                    '$id'  => $class->getDatabaseIdentifierValue($id),
+                    '$db'  => $this->getDocumentDatabase($class->name)->getName(),
+                ];
+                break;
+
+            default:
+                throw new \InvalidArgumentException("Reference type {$storeAs} is invalid.");
         }
 
         /* If the class has a discriminator (field and value), use it. A child
          * class that is not defined in the discriminator map may only have a
          * discriminator field and no value, so default to the full class name.
          */
         if (isset($class->discriminatorField)) {
-            $dbRef[$class->discriminatorField] = isset($class->discriminatorValue)
+            $reference[$class->discriminatorField] = isset($class->discriminatorValue)
                 ? $class->discriminatorValue
                 : $class->name;
         }
 
         /* Add a discriminator value if the referenced document is not mapped
          * explicitly to a targetDocument class.
          */
-        if ($referenceMapping !== null && ! isset($referenceMapping['targetDocument'])) {
+        if (! isset($referenceMapping['targetDocument'])) {
             $discriminatorField = $referenceMapping['discriminatorField'];
             $discriminatorValue = isset($referenceMapping['discriminatorMap'])
                 ? array_search($class->name, $referenceMapping['discriminatorMap'])
@@ -736,10 +754,31 @@ public function createDBRef($document, array $referenceMapping = null)
                 $discriminatorValue = $class->name;
             }
 
-            $dbRef[$discriminatorField] = $discriminatorValue;
+            $reference[$discriminatorField] = $discriminatorValue;
+        }
+
+        return $reference;
+    }
+
+    /**
+     * Returns a DBRef array for the supplied document.
+     *
+     * @param mixed $document A document object
+     * @param array $referenceMapping Mapping for the field that references the document
+     *
+     * @throws \InvalidArgumentException
+     * @return array A DBRef array
+     * @deprecated Deprecated in favor of createReference; will be removed in 2.0
+     */
+    public function createDBRef($document, array $referenceMapping = null)
+    {
+        @trigger_error('The ' . __METHOD__ . ' method has been deprecated and will be removed in ODM 2.0. Use createReference() instead.', E_USER_DEPRECATED);
+
+        if (!isset($referenceMapping['storeAs'])) {
+            $referenceMapping['storeAs'] = ClassMetadataInfo::REFERENCE_STORE_AS_DB_REF;
         }
 
-        return $dbRef;
+        return $this->createReference($document, $referenceMapping);
     }
 
     /**

lib/Doctrine/ODM/MongoDB/Hydrator/HydratorFactory.php

@@ -255,13 +255,8 @@ private function generateHydratorClass(ClassMetadata $class, $hydratorClassName,
         /** @ReferenceOne */
         if (isset(\$data['%1\$s'])) {
             \$reference = \$data['%1\$s'];
-            if (isset(\$this->class->fieldMappings['%2\$s']['storeAs']) && \$this->class->fieldMappings['%2\$s']['storeAs'] === ClassMetadataInfo::REFERENCE_STORE_AS_ID) {
-                \$className = \$this->class->fieldMappings['%2\$s']['targetDocument'];
-                \$mongoId = \$reference;
-            } else {
-                \$className = \$this->unitOfWork->getClassNameForAssociation(\$this->class->fieldMappings['%2\$s'], \$reference);
-                \$mongoId = \$reference['\$id'];
-            }
+            \$className = \$this->unitOfWork->getClassNameForAssociation(\$this->class->fieldMappings['%2\$s'], \$reference);
+            \$mongoId = ClassMetadataInfo::getReferenceId(\$reference, \$this->class->fieldMappings['%2\$s']['storeAs']);
             \$targetMetadata = \$this->dm->getClassMetadata(\$className);
             \$id = \$targetMetadata->getPHPIdentifierValue(\$mongoId);
             \$return = \$this->dm->getReference(\$className, \$id);
@@ -296,7 +291,7 @@ private function generateHydratorClass(ClassMetadata $class, $hydratorClassName,
         \$className = \$mapping['targetDocument'];
         \$targetClass = \$this->dm->getClassMetadata(\$mapping['targetDocument']);
         \$mappedByMapping = \$targetClass->fieldMappings[\$mapping['mappedBy']];
-        \$mappedByFieldName = isset(\$mappedByMapping['storeAs']) && \$mappedByMapping['storeAs'] === ClassMetadataInfo::REFERENCE_STORE_AS_ID ? \$mapping['mappedBy'] : \$mapping['mappedBy'].'.\$id';
+        \$mappedByFieldName = ClassMetadataInfo::getReferenceFieldName(\$mappedByMapping['storeAs'], \$mapping['mappedBy']);
         \$criteria = array_merge(
             array(\$mappedByFieldName => \$data['_id']),
             isset(\$this->class->fieldMappings['%2\$s']['criteria']) ? \$this->class->fieldMappings['%2\$s']['criteria'] : array()

lib/Doctrine/ODM/MongoDB/Mapping/ClassMetadataInfo.php

@@ -103,6 +103,7 @@ class ClassMetadataInfo implements \Doctrine\Common\Persistence\Mapping\ClassMet
     const REFERENCE_STORE_AS_ID = 'id';
     const REFERENCE_STORE_AS_DB_REF = 'dbRef';
     const REFERENCE_STORE_AS_DB_REF_WITH_DB = 'dbRefWithDb';
+    const REFERENCE_STORE_AS_REF = 'ref';
 
     /* The inheritance mapping types */
     /**
@@ -474,6 +475,48 @@ public function __construct($documentName)
         $this->rootDocumentName = $documentName;
     }
 
+    /**
+     * Helper method to get reference id of ref* type references
+     * @param mixed  $reference
+     * @param string $storeAs
+     * @return mixed
+     * @internal
+     */
+    public static function getReferenceId($reference, $storeAs)
+    {
+        return $storeAs === ClassMetadataInfo::REFERENCE_STORE_AS_ID ? $reference : $reference[ClassMetadataInfo::getReferencePrefix($storeAs) . 'id'];
+    }
+
+    /**
+     * Returns the reference prefix used for a reference
+     * @param string $storeAs
+     * @return string
+     */
+    private static function getReferencePrefix($storeAs)
+    {
+        if (!in_array($storeAs, [ClassMetadataInfo::REFERENCE_STORE_AS_REF, ClassMetadataInfo::REFERENCE_STORE_AS_DB_REF, ClassMetadataInfo::REFERENCE_STORE_AS_DB_REF_WITH_DB])) {
+            throw new \LogicException('Can only get a reference prefix for DBRef and reference arrays');
+        }
+
+        return $storeAs === ClassMetadataInfo::REFERENCE_STORE_AS_REF ? '' : '$';
+    }
+
+    /**
+     * Returns a fully qualified field name for a given reference
+     * @param string $storeAs
+     * @param string $pathPrefix The field path prefix
+     * @return string
+     * @internal
+     */
+    public static function getReferenceFieldName($storeAs, $pathPrefix = '')
+    {
+        if ($storeAs === ClassMetadataInfo::REFERENCE_STORE_AS_ID) {
+            return $pathPrefix;
+        }
+
+        return ($pathPrefix ? $pathPrefix . '.' : '') . static::getReferencePrefix($storeAs) . 'id';
+    }
+
     /**
      * {@inheritDoc}
      */