Sequelize:如何访问 [object Promise] 或从 Promise 返回值? [英] Sequelize: How to access [object Promise] or return value from promise?

问题描述

我有一种情况，我只想在用户登录时访问用户数据.当我不查询数据库时，我有以下代码可以工作.这意味着 var tmp 设置为 YOUR_API_KEY.但是在查询数据库时，我得到了[object Promise].谷歌搜索后，我尝试了不同的解决方案，但没有解决我的问题.

I have a situation where I want to access the user data only if he or she is logged in. I have the following code that works when I'm not querying the database. Meaning the var tmp is set to YOUR_API_KEY. But when querying the database, I get [object Promise]. I tried different solutions after googling around, but nothing seams to solve my question.

var tmp = function() {

   if(req.session.user) {

      return User.findOne({
         where: {
                    id: req.session.user.userID
                },
                include: [
                    { model: Apikey }
                ]
            }).then(function(sqlUser) {
                return sqlUser.Apikeys['0'].kay;
            });

        } else {
            return "YOUR_API_KEY"
        }
}

推荐答案

使用回调"

var tmp = function(callback) {
  if(req.session.user) {
    return User.findOne({
      where: {
              id: req.session.user.userID
            },
            include: [
              { model: Apikey }
            ]
    }).then(function(sqlUser) {
      callback(sqlUser.Apikeys['0'].kay)
    });
  } else {
    callback("YOUR_API_KEY")
  }
}

//now you can use your function like this
tmp(function(apiKey){
  //do something with apiKey e.g.:
  console.log(apiKey)
});

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