Fix functions vars default response

Changed default from array to class

app/controllers/api/functions.php

@@ -45,7 +45,7 @@ App::post('/v1/functions')
     ->param('name', '', new Text(128), 'Function name. Max length: 128 chars.')
     ->param('execute', [], new ArrayList(new Text(64)), 'An array of strings with execution permissions. By default no user is granted with any execute permissions. [learn more about permissions](https://appwrite.io/docs/permissions) and get a full list of available permissions.')
     ->param('runtime', '', new WhiteList(array_keys(Config::getParam('runtimes')), true), 'Execution runtime.')
-    ->param('vars', [], new Assoc(), 'Key-value JSON object that will be passed to the function as environment variables.', true)
+    ->param('vars', new stdClass(), new Assoc(), 'Key-value JSON object that will be passed to the function as environment variables.', true)
     ->param('events', [], new ArrayList(new WhiteList(array_keys(Config::getParam('events')), true)), 'Events list.', true)
     ->param('schedule', '', new Cron(), 'Schedule CRON syntax.', true)
     ->param('timeout', 15, new Range(1, 900), 'Function maximum execution time in seconds.', true)

src/Appwrite/Utopia/Response/Model/Func.php

@@ -4,6 +4,8 @@ namespace Appwrite\Utopia\Response\Model;
 
 use Appwrite\Utopia\Response;
 use Appwrite\Utopia\Response\Model;
+use stdClass;
+use Utopia\Database\Document;
 
 class Func extends Model
 {
@@ -62,7 +64,7 @@ class Func extends Model
             ->addRule('vars', [
                 'type' => self::TYPE_JSON,
                 'description' => 'Function environment variables.',
-                'default' => new \stdClass,
+                'default' => new \stdClass(),
                 'example' => ['key' => 'value'],
             ])
             ->addRule('events', [
@@ -118,4 +120,22 @@ class Func extends Model
     {
         return Response::MODEL_FUNCTION;
     }
+
+    /**
+     * Get Collection
+     * 
+     * @return string
+     */
+    public function filter(Document $document): Document
+    {
+        $prefs = $document->getAttribute('vars');
+        if($prefs instanceof Document) {
+            $prefs = $prefs->getArrayCopy();
+        }
+
+        if(is_array($prefs) && empty($prefs)) {
+            $document->setAttribute('vars', new stdClass);
+        }
+        return $document;
+    }
 }