Question

我的数据库中有一个conversations集合，我正在使用Mongoose来更新单个文档的unread标记。

这是我的代码：

router.post('/reply/:conversation_id', ensureAuthenticated, (req, res, next) => {
  Conversation.findById(req.params.conversation_id, (err, conversation) => {

    // If the user that's logged in was the one who created the conversation, and is submitting a reply, run this code
    if (req.user._id == conversation.created_by_user_id) {
      User.findById(conversation.sent_to_user_id, (err, user) => {
        Message.create({
          //...
        }, (err, message) => {
          if (err) {
            console.log(err)
          } else {
            message.conversations.push(conversation._id)
            conversation.unread = true
            conversation.save()  // This is being saved to the database
            message.save()
            res.redirect('/conversations/' + conversation._id)
          }
        })
      })
    } else {
    // Otherwise, if the user that's logged in was *not* the one who created the conversation, and is submitting a reply, run this code

      User.findById(conversation.created_by_user_id, (err, user) => {
        Message.create({
          //...
        }, (err, message) => {
          if (err) {
            console.log(err)
          } else {
            message.conversations.push(conversation._id)
            conversation.unread = true
            conversation.save() // This is not being saved
            message.save()
            res.redirect('/conversations/' + conversation._id)
          }
        })
      })
    }
  })
});

if部分将conversation.unread = true保存到数据库。 else部分没有。

条件的两个部分基本上都做同样的事情（将对话的unread标志保存为true，并保存消息），但只有条件的第一部分才能设置{{1到真。

有人可以帮我弄清楚为什么unread标记未在unread声明中保存为true吗？

Answer 1

您正试图同步拨打save。

.save接受回调。它是异步的。

请参阅下面的我的版本。

router.post('/reply/:conversation_id', ensureAuthenticated, (req, res, next) => {
  Conversation.findById(req.params.conversation_id, (err, conversation) => {

    // If the user that's logged in was the one who created the conversation, and is submitting a reply, run this code
    if (req.user._id == conversation.created_by_user_id) {
      User.findById(conversation.sent_to_user_id, (err, user) => {
        Message.create({
          //...
        }, (err, message) => {
          if (err) {
            console.log(err)
          } else {
            message.conversations.push(conversation._id)
            conversation.unread = true
            conversation.save()  // This is being saved to the database
            message.save()
            res.redirect('/conversations/' + conversation._id)
          }
        })
      })
    } else {
    // Otherwise, if the user that's logged in was *not* the one who created the conversation, and is submitting a reply, run this code

    User.findById(conversation.created_by_user_id, (err, user) => {
      Message.create({
          //...
        }, (err, message) => {
          if (err) {
            console.log(err)

            //return here
            return res.redirect('/error'); //

          } else {
            message.conversations.push(conversation._id)
            conversation.unread = true

            //.save takes a function callback
            conversation.save((err) => {

              //.save takes a function callback
              message.save((err) => {
                res.redirect('/conversations/' + conversation._id)
              })
            })
          }
        })
    })
  }
})
});

Mongoose没有更新未读标志

1 个答案: