framework/caching/migrations/m150909_153426_cache_init.php
public function down()
    {
        $cache = $this->getCache();
        $this->db = $cache->db;

        $this->dropTable($cache->cacheTable);
    }
public function down()
    {
        $cache = $this->getCache();
        $this->db = $cache->db;

        $this->dropTable($cache->cacheTable);
    }
{@inheritdoc}