feat: Add the protected apiVersion property

src/Service/Resource.php

@@ -48,6 +48,9 @@ class Resource
     /** @var string $rootUrl */
     private $rootUrl;
 
+    /** @var string $apiVersion */
+    protected $apiVersion;
+
     /** @var \Google\Client $client */
     private $client;
 
@@ -235,6 +238,13 @@ public function call($name, $arguments, $expectedClass = null)
             return $request;
         }
 
+        // If the class which is extending from this one contains
+        // an Api Version, add it to the header
+        if ($this->apiVersion) {
+            $request = $request
+                ->withHeaders('X-Goog-Api-Version', $this->apiVersion);
+        }
+
         return $this->client->execute($request, $expectedClass);
     }
 

test.php

@@ -0,0 +1,25 @@
+<?php
+class Test
+{
+    protected $name;
+
+    public function getName(){
+        if ($this->name) {
+            return $this->name;
+        }
+
+        return "No name";
+    }
+}
+
+class Child extends Test
+{
+    protected $name = "Hector";
+}
+
+$p = new Test();
+
+print($p->getName());
+
+$c = new Child();
+print($c->getName());