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http://mongoosejs.com/docs/ap...

MyModel.update({ name: 'Tobi' }, { ferret: true }, { upsert: true }, function (err, raw) {
if (err) return handleError(err);
console.log('The raw response from Mongo was ', raw);
});

Set the upsert attribute of the third parameter of the update method to true

Book.update(
// 查詢
{
    name: "The Kite Runner"
},
// 更新
{
    auther: "Khaled Hosseini"
},
// 其他參數(shù)
{
    upsert: true,
}, function(err, doc)
{
    if (err) console.log(err);
    console.log(doc);
});

• Update the document’s auther attribute when The Kite Runner exists in the database;

• When there is no The Kite Runner in the database, insert The Kite Runner document;