using static instead of self

renaming `internalCreateOrUpdate` to `_createOrUpdate`
renaming `$conditions` to `$keys`
adding block comment for `_createOrUpdate` method.

lib/Models/Form.php

@@ -108,7 +108,4 @@ class Form extends Model {
     return $orm->whereNull('deleted_at');
   }
 
-  static function createOrUpdate($data = array()) {
-    return parent::internalCreateOrUpdate($data);
-  }
 }