检查Javascript中对象数组中的键是否？

Question

我尝试检查一个值是否在数组的对象中。之后我推送的对象是值不在数组中。我该怎么做？

router.post('/save', (req, res) => {
let userId = req.user.id
let dataPushSave = req.body.idSave
let dataPushSaveObj = {idSave: dataPushSave}

User.findById(userId, (err, user) => {
    if (user.favorites.idSave !== dataPushSave) {
        user.favorites.push(dataPushSaveObj)
        user.save()
    }
})

我的猫鼬模型：

    const User = new Schema({
    firstName: {
        type: String,
        required: true
    },
    favorites: [{
        _id: Object,
        idSave: String
    }]
});

Answer 1

    const User = new Schema({
    firstName: {
        type: String,
        required: true
    },
    favorites: [{
        _id: Object,
        idSave: String
    }]
});

从上述架构中，从收藏夹中删除 _id: Object。 我会推荐下面的架构

const User = new Schema({
    firstName: {
        type: String,
        required: true
    },
    favorites: {
        type: [new Schema({
        idSave: { type: String },
      }, { _id: false })]
    }
});

然后使用 $addToSet 运算符确保收藏夹数组中没有重复项。

let user;
User.findByIdAndUpdate(
  userId, 
  { $addToSet: {  favorites: dataPushSaveObj } }, 
  { new: true }, // this option will make sure you get the new updated docc
  (err, doc) => {
    if (err) console.error(err);
    user = doc;
  }
);