rake db:setup
drop schema rails4_mysql_mongo_development;
use rails4_mysql_mongo_development
db.dropDatabase();
http://chenzhou123520.iteye.com/blog/1630993
rake db:setup
drop schema rails4_mysql_mongo_development;
use rails4_mysql_mongo_development
db.dropDatabase();
http://chenzhou123520.iteye.com/blog/1630993