javascript - 普通更新和使用 $set 运算符更新有什么区别？

Question

普通方法:

module.exports = (_id, newInfo) => {
    return User.update( {_id} , newInfo);
};

使用 $set 运算符:

module.exports = (_id, newInfo) => {
    return User.update( {_id} , {$set: newInfo} );
};

Answer 1

正如它所说的here :

不使用$set进行更新，

if the replacement object is a document, the matching documents will be replaced (except the _id values if no _id is set)

而我们使用$set，

To update only selected fields, $set operator needs to be used. Following replacement object replaces author value but leaves everything else intact.