括号前 id 的输出嵌套数组未以正确方式输出

Question

我试图根据用户 ID 组合 textContent 数组进行聊天对话，但退出结果不是我要寻找的，来自@Barman 答案而不是 sender_user ID 必须是“用户”表中用户的 ID，检查我的代码示例。我是新手，任何帮助将不胜感激。谢谢！

这就是我想要达到的目标：

 contacts: [
        {
          id: 1 
        },
        {
          id: 2  
        } 
      ],
       
            "chats": {
              userid->  "1": {
                    "isPinned": "true",
                   "msg": [
                        {
                            "textContent": "Hello",
                            "time": "2020-10-07T15:04:40.000Z",
                            "isSent": "true",
                            "isSeen": "true"
                        },
                        {
                            "textContent": "Hello to you, john!",
                            "time": "2020-10-07T15:04:40.000Z",
                            "isSent": "true",
                            "isSeen": "true"
                        }
                    ]
                },
                "2": {
                    "isPinned": "true",
                    "msg": [
                        {
                            "textContent": "how are you?",
                            "time": "2020-10-07T15:04:40.000Z",
                            "isSent": "true",
                            "isSeen": "true"
                        },
                        {
                            "textContent": "im fine thx you?",
                            "time": "2020-10-07T15:04:40.000Z",
                            "isSent": "true",
                            "isSeen": "true"
                        }
                    ]
                }
            }
     

基于我的退出代码的结果是这样的，id "1":{ 和 "2" 必须来自 getContacts 用户 ID，而不是来自 sender_userid:

 {
    "chats": {
        "1": {
            "isPinned": "false",
            "msg": [
                {
                    "textContent": "Hello",
                    "time": "Mon Dec 10 2018 07:45:00 GMT+0000 (GMT)",
                    "isSent": "true",
                    "isSeen": "true"
                },
                {
                    "textContent": "im fine thx you?",
                    "time": "Mon Dec 10 2018 07:45:23 GMT+0000 (GMT)",
                    "isSent": "true",
                    "isSeen": "true"
                }
            ]
        },
        "2": {
            "isPinned": "false",
            "msg": [
                {
                    "textContent": "How are you?",
                    "time": "Mon Dec 10 2018 07:45:00 GMT+0000 (GMT)",
                    "isSent": "true",
                    "isSeen": "true"
                },
{
                    "textContent": "Hello to you, john!",
                    "time": "Mon Dec 10 2018 08:45:00 GMT+0000 (GMT)",
                    "isSent": "true",
                    "isSeen": "true"
                }
            ]
        }

Mysql 聊天和用户表：

js代码：

getContacts: (q, callBack) => {
    pool.query(
      'SELECT u.* FROM `users` u INNER JOIN `my_friends` f ON f.myid = u.id WHERE f.friend_id = ? AND f.status = ?',
      [q, 1],
      (error, contacts) => {
        if (error) {
          callBack(error)
        }
        return callBack(null, contacts)
      }
    )
  },
getChats: callBack => {
  pool.query(
    'SELECT * FROM chat WHERE reciever_userid=1 AND sender_userid=5 OR sender_userid=1 AND reciever_userid=5  ORDER BY time', [],
    (error, chats) => {
      if (error) {
        callBack(error)
      }
      return callBack(null, chats)
    }
  )
}

getChats((err, chatz) => {
  if (err) {
    console.log(err)
    return
  }

  getChats: (req, res) => {  
    getContacts((err, users) => {
      getChats((err, chatz) => {
        if (err) {
          console.log(err)
          return
        } 
         
        const chats = {}  
        chatz.forEach(({sender_userid, isPinned, textContent, time, isSent, isSeen}) => {
          if (chats[sender_userid]) {
            chats[sender_userid].msg.push({
              textContent,
              time,
              isSent,
              isSeen
            })
          } else {
            chats[sender_userid] = {
              isPinned,
              msg: [
                {
                  textContent,
                  time,
                  isSent,
                  isSeen
                }
              ]
            }
          }
        })
       
        return res.json({ 
          chats
        })
      })
    })
  }
}

Answer 1

为您的WHERE 条件添加括号，因为AND 和OR 的默认优先级与您所需的分组不匹配。

您需要创建新对象，而不是修改现有的el 对象，以便将所有消息合并为同一发件人。

使用el.sender_userid 作为您正在创建的chats 属性中的键。如果已经存在具有该键的元素，则将每个聊天推送到 msg 数组中。

getChats: callBack => {
  pool.query(
    'SELECT * FROM chat WHERE (reciever_userid=1 AND sender_userid=5) OR (sender_userid=1 AND reciever_userid=5 ) ORDER BY time', [],
    (error, chats) => {
      if (error) {
        callBack(error)
      }
      return callBack(null, chats)
    }
  )
}

getChats((err, chatz) => {
  if (err) {
    console.log(err)
    return
  }

  const chats = {};
  chatz.forEach(({sender_userid, isPinned, textContent, time, isSent, isSeen}) => {
    if (chats[sender_userid]) {
      chats[sender_userid].msg.push({
        textContent,
        time,
        isSent,
        isSeen
      });
    } else {
      chats[sender_userid] = {
        isPinned,
        msg: [{
          textContent,
          time,
          isSent,
          isSeen
        }]
      };
    }
  });

  return res.json({
    chats
  })
})