[英]How do I add new object or push into array Mongodb Compass NodeJS Express (update is not a function)?
此时我尝试查找在这种情况下有效的查询,但随后想更新 object。 所以我想检查审查 object 是否存在,如果不存在,则首先创建该键名,然后将该 object 推送到数组中。 否则推入现有的 object 阵列中。
默认 object 看起来像(没有评论对象):
const mongoose = require('mongoose'); const musicSchema = mongoose.Schema({ id: { type: Number, required: true }, artist: { type: String, required: true }, title: { type: String, required: true }, release_year: { type: Number, required: true }, genre_id: { type: Number, required: true }, image_url: { type: String, required: true }, reviews: [{ id: { type: Number, required: true }, locale: { type: String, required: true }, rating: { type: Number, required: true }, comment: { type: String, required: true } }] }); const Music = mongoose.model("Music", musicSchema); // now we have to create our model console.log; module.exports = Music; // export our created model
app.post('/addReview/:id', async (req, res) => { let idNumber = parseInt(req.params.id); // 501437 let reviewObject = req.body; // {id: "501437", locale: "nl", rating: 3, text: "helello"} try { const music = client.db('database').collection('music'); const query = { id: idNumber }; const musicSong = await music.findOne(query); await musicSong.update({ $push: { reviews: reviewObject } }); // error comes from here } catch (err) { console.log(err); } });
reviews
字段是否不存在,然后将其初始化为空白数组reviews
save()
保存主文档app.post('/addReview/:id', async (req, res) => {
let idNumber = parseInt(req.params.id); // 501437
let reviewObject = req.body; // {id: "501437", locale: "nl", rating: 3, text: "helello"}
try {
const music = client.db('database').collection('music');
const query = { id: idNumber };
let musicSong = await music.findOne(query);
if (!Array.isArray(musicSong.reviews)) {
musicSong.reviews = [];
}
musicSong.reviews.push(reviewObject);
music.save();
} catch (err) {
console.log(err);
}
});
使用updateOne()
的第二个选项:
如果您使用更新方法,则不需要查找、检查和保存操作,
app.post('/addReview/:id', async (req, res) => {
const query = { id: parseInt(req.params.id) };
let reviewObject = req.body;
try {
const music = client.db('database').collection('music');
await music.updateOne(query, { $push: { reviews: reviewObject } });
} catch (err) {
console.log(err);
}
});
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