简单的解决方案，因为有固定数量的级别，是预先创建每个UserLevel"并保存它们，然后在其他地方你只需要做更新而不是创建/更新.

The simple solution, since there are a fixed number of levels, is to pre-create each "UserLevel" and save them, and then everywhere else you just do updated instead of create/update.