Merge pull request parse-community#175 from ParsePlatform/gfosco.getR…

…elation

Added param to getRelation for Issue 126

src/Parse/ParseObject.php

@@ -1171,15 +1171,16 @@ private function mergeAfterSave($result)
  /**
  * Access or create a Relation value for a key.
  *
- * @param string $key The key to access the relation for.
+ * @param string $key The key to access the relation for.
+ * @param string $className The target class name.
  *
  * @return ParseRelation The ParseRelation object if the relation already
  * exists for the key or can be created for this key.
  */
- public function getRelation($key)
+ public function getRelation($key, $className = null)
  {
- $relation = new ParseRelation($this, $key);
- if (isset($this->estimatedData[$key])) {
+ $relation = new ParseRelation($this, $key, $className);
+ if (!$className && isset($this->estimatedData[$key])) {
  $object = $this->estimatedData[$key];
  if ($object instanceof ParseRelation) {
  $relation->setTargetClass($object->getTargetClass());