[英]Mongoose: updating a single sub-document issues
架构:
var educationSchema = new Schema({
schoolName: String,
startDate: Number,
endDate: Number,
degree: String,
major: String,
grade: String
});
var UserSchema = new Schema({
firstName: String,
lastName: String,
education: [educationSchema]
});
更新代码:
User.findOneAndUpdate(
{"_id": req.user.id, "education._id": req.body.id},
{
"$set": {
"education.$": req.body
}
},
function(err, edu) {
}
);
现在,如果用户仅在UI
上编辑schoolName
,则会发生以下情况:
预保存状态:
{
"_id" : ObjectId("5878fb4f51ec530358fea907"),
"firstName" : "John",
"lastName" : "Doe",
"education" : [
{
"schoolName" : "ABC",
"startDate" : 1998,
"endDate" : 2005,
"degree" : "Bachelor’s Degree",
"major" : "CS",
"grade" : "3.5",
"_id" : ObjectId("5878fbb951ec530358fea909")
}
]
}
保存后状态:
"education" : [
{
"schoolName" : "XYZ"
}
]
$set
不是正确的运算符吗?
更新education.$
更新子文档。 如果您只想更新schoolName,您必须使用education.$.schoolName
。
将您的更新代码更改为:
User.findOneAndUpdate(
{"_id": req.user.id, "education._id": req.body.id},
{
"$set": {
"education.$.schoolName": req.body
}
},
function(err, edu) {
}
);
编辑:( 更新通过req.body发送的任何字段 )
const update = {};
Object.getOwnPropertyNames(req.body).forEach(key => {
update['education.$.' + key] = req.body[key];
});
User.findOneAndUpdate(
{"_id": req.user.id, "education._id": req.body.id},
{
"$set": update
},
function(err, edu) {
}
);
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