AdvancedCustomFields compatibility for writing / creating posts

There’s already something going on with the above mentioned plugin in regards to JSON_API, but for those stuck with an old version of ACF (<4) who need to write ACF-fields (eg. i am collecting a json-feed from several sources ) … well i’ve got a dirty solution:

edit the post.php of JSON_API (/models/post.php) ~line 113

if (isset($wp_values['ID'])) {
      $this->id = wp_update_post($wp_values);
    } else {
      $this->id = wp_insert_post($wp_values);
    }
+ if (isset($values['fields'])) {
+    	// add custom fields
+    	foreach ($values["fields"] as $metakey => $metavalue) {
+    		update_post_meta($this->id, $metakey, $metavalue);
+    	}
+	 }

that should do the work.

if someone knows a better way to do that, maybe extending the class or something like that, feel free to correct me here.

http://wordpress.org/extend/plugins/json-api/