symfony - fosmessager为什么要“销毁”fosuser的实体用户

Question

我按照文档集成了 fosmessagerbundle，在第 5 步结束时我运行了命令

php app/console doctrine:schema:update --dump-sql

我收到了这条消息

DROP INDEX UNIQ_957A647992FC23A8 ON fos_user;
DROP INDEX UNIQ_957A6479A0D96FBF ON fos_user;
ALTER TABLE fos_user DROP username, DROP username_canonical, DROP email, DROP em
ail_canonical, DROP enabled, DROP salt, DROP password, DROP last_login, DROP loc
ked, DROP expired, DROP expires_at, DROP confirmation_token, DROP password_reque
sted_at, DROP roles, DROP credentials_expired, DROP credentials_expire_at;

我已正确遵循说明，但用户实体将为空。

任何帮助将非常感激。