我的猫鼬模型:
const userSchema = Schema({
firstName: String,
lastName: String,
books: [{title: String, author: String, isbn: Number}]
});
我想为每个POST请求添加a new title & author with a book object
。我目前给我positional operator did not find the match
错误的方法:
var User = mongoose.model("User", userSchema);
router.post('/submit', (req, res) => {
let update={
'books.$.title' : req.body.title,
'books.$.author' : req.body.author
}
User.findOneAndUpdate({_id:req.body.user_id},{$push: update},{new: true}).exec(function(err, doc) {
if (err){
console.log(err);
return;
}
res.send(doc);
});
});
对于我的数据库中具有不同作者和标题的两种形式的Submit(POST),我希望获得以下结果:
{
_id: 'SomeId'
firstName: 'John',
lastName: 'Cena',
books: [{title: 'a', author:'b' }, {{title: 'c', author:'d' }}]
}
我都不在乎这两篇文章中的ISBN,因为在我们的架构中它不是必填字段。由于我的books
子文档开始时为空,因此我无法在代码中正确设置positional operator ($)
。请帮助我正确编写findOneAndUpdate
查询!
答案 0 :(得分:1)
$push
需要字段名称和值,在您的情况下,字段名称为book
,值是对象{author, title}
User.findOneAndUpdate({_id:req.user._id}, {$push : { books : { author: "c", title: "d"}}})