Question

我正在尝试在node.js中创建一些同步，我遇到了一些问题。如何从newArr获取每个项目将成为返回对象的数组then？

Rating.find({userID: req.body.id}).then( (ratings) => {

   var newArr = ratings.map( (rating) => {

        User.find({_id: rating.reviewerID}).then( (user) => {        
               return {
                 firstName: user[0].firstName,
                 text: rating.text,
                 rating: rating.rating
               }
        }) 
    })

    console.log(newArr);

});

Answer 1

您的方式不正确

Rating.aggregate([
{
    $lookup: {
        localField: "reviewerID",
        from: "user",
        foreignField: "_id",
        as: "some_data"
    },
},

], function(err, data) {
     if (err) throw err
     if (!data)return res.send('data not ');
     return res.status(200).json(data)
   }
})

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如何使用.map synchronic返回新数组？

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