我有这个应该删除文档的代码：

const groups = require('./groups')
const ingroups = require('./ingroups')
    const leavegroup = await ingroups.findOne({User:message.author.id})
    //Remove 1 from the member count
    if (!leavegroup) {
    return message.reply('You are not in a group and therefore you cannot leave one.')
}
    message.reply('You have now left the group and are free to go join another one.')
    ingroups.findOneandDelete({User:message.author.id})
  }

它返回您现在已经离开了群组，可以自由地加入另一个群组，但实际上并没有删除数据库中的文档。

如何让它删除文档？