Minor changes to object interfaces.

Author: lindyhopchris

src/Contracts/Object/Relationships/RelationshipInterface.php

@@ -20,6 +20,7 @@
 
 use CloudCreativity\JsonApi\Contracts\Object\ResourceIdentifier\ResourceIdentifierCollectionInterface;
 use CloudCreativity\JsonApi\Contracts\Object\ResourceIdentifier\ResourceIdentifierInterface;
+use CloudCreativity\JsonApi\Contracts\Object\StandardObjectInterface;
 use RuntimeException;
 
 /**
@@ -43,9 +44,15 @@ public function getData();
 
     /**
      * @return bool
+     * @deprecated use `isHasOne` instead
      */
     public function isBelongsTo();
 
+    /**
+     * @return bool
+     */
+    public function isHasOne();
+
     /**
      * @return bool
      */

src/Contracts/Object/StandardObjectInterface.php

@@ -39,6 +39,14 @@ public function get($key, $default = null);
      */
     public function getProperties(array $keys, $default = null);
 
+    /**
+     * Get properties if they exist.
+     *
+     * @param array $keys
+     * @return array
+     */
+    public function getMany(array $keys);
+
     /**
      * @param $key
      * @param $value

src/Object/ObjectProxyTrait.php

@@ -83,6 +83,26 @@ public function getProperties(array $keys, $default = null)
         return $ret;
     }
 
+    /**
+     * Get properties if they exist.
+     *
+     * @param array $keys
+     * @return array
+     */
+    public function getMany(array $keys)
+    {
+        $ret = [];
+
+        foreach ($keys as $key) {
+
+            if ($this->has($key)) {
+                $ret[$key] = $this->get($key);
+            }
+        }
+
+        return $ret;
+    }
+
     /**
      * @param $key
      * @param $value

src/Object/Relationships/Relationship.php

@@ -52,9 +52,17 @@ public function getData()
     }
 
     /**
-     * @return bool
+     * @inheritdoc
      */
     public function isBelongsTo()
+    {
+        return $this->isHasOne();
+    }
+
+    /**
+     * @return bool
+     */
+    public function isHasOne()
     {
         if (!$this->has(static::DATA)) {
             return false;