for new issue

edit Connection.php for fixing
[Symfony\Component\Debug\Exception\FatalThrowableError]         
  Call to a member function supportsSchemaTransactions() on null 

add following in existing file

use duxet\Rethinkdb\Schema\Grammar;
and
$this->schemaGrammar = new Grammar();
after 
$this->useDefaultPostProcessor();

src/Connection.php

@@ -3,6 +3,7 @@
 namespace duxet\Rethinkdb;
 
 use duxet\Rethinkdb\Query\Builder as QueryBuilder;
+use duxet\Rethinkdb\Schema\Grammar;
 use r;
 
 class Connection extends \Illuminate\Database\Connection
@@ -35,6 +36,7 @@ public function __construct(array $config)
         // so we initialize these to their default values when starting.
         $this->useDefaultQueryGrammar();
         $this->useDefaultPostProcessor();
+        $this->schemaGrammar = new Grammar();
     }
 
     /**