[2.0][DDC-251] Fixed.

lib/Doctrine/ORM/Mapping/OneToOneMapping.php

@@ -233,7 +233,7 @@ class OneToOneMapping extends AssociationMapping
 
             $targetEntity = $em->getUnitOfWork()->getEntityPersister($this->targetEntityName)->load($joinColumnValues, $targetEntity, $this, $hints);
             
-            if ($targetEntity !== null && $inverseField) {
+            if ($targetEntity !== null && $inverseField &&  ! $targetClass->isCollectionValuedAssociation($inverseField)) {
                 $targetClass->reflFields[$inverseField]->setValue($targetEntity, $sourceEntity);
             }
         } else {

lib/Doctrine/ORM/UnitOfWork.php

@@ -463,8 +463,8 @@ class UnitOfWork implements PropertyChangedListener
 
             if ($class->isCollectionValuedAssociation($name) && $actualData[$name] !== null
                     && ! ($actualData[$name] instanceof PersistentCollection)) {
-                // If $actualData[$name] is Collection then unwrap the array
-                if ( ! $actualData[$name] instanceof ArrayCollection) {
+                // If $actualData[$name] is not a Collection then use an ArrayCollection.
+                if ( ! $actualData[$name] instanceof Collection) {
                     $actualData[$name] = new ArrayCollection($actualData[$name]);
                 }