mongoosejs:执行user.save（）方法将数据保存到mongodb时出错

当dbUser在同一实例中实例化并给定值时，可以调用函数dbUser.save将数据输入localhost:mongodb

var gmailUserSchema = new mongoose.Schema({
displayName: String,
emails: [ { value: String } ],
name: { familyName: String, givenName: String } 
})

// compiling our schema into a Model.
var gmailUser = mongoose.model('gmailUser', gmailUserSchema);
var dbUser = new gmailUser ({
                displayName: 'profile.displayName',
                emails: [{value: 'profile.emails'}] ,
                name: { familyName: 'profile.familyName',
                givenName: 'profile.givenName' }
            });

dbUser.save(function (err) {
  if (err) // ...
  console.log('could not save');
});

但是如果我将值与构造函数分开放入'dbUser'中

// defining schema 
var gmailUserSchema = new mongoose.Schema({
displayName: String,
emails: [ { value: String } ],
name: { familyName: String, givenName: String } 
})

// compiling our schema into a Model.
var gmailUser = mongoose.model('gmailUser', gmailUserSchema);
var dbUser = new gmailUser;

dbUser = {
                displayName: '1profile.displayName',
                emails: [{value: '1profile.emails'}] ,
                name: { familyName: '1profile.familyName',
                givenName: '1profile.givenName' }
}


dbUser.save(function (err) {
 if (err) // ...
 console.log('could not save');
});

我在编译时遇到以下错误：

dbUser.save(function (err) {
       ^
TypeError: Object #<Object> has no method 'save'
    at Object.<anonymous> (/Users/apple/Documents/herokuApp/onlymongoose-3.js:65:8)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)

dbUser.save（函数（err）{
^
TypeError:对象#没有方法“保存”
at对象。（/Users/apple/Documents/herokuApp/onlymongose-3.js:65:8）
在模块处编译（Module.js:456:26）
在Object.Module.\u extensions..js（Module.js:474:10）
在Module.load（Module.js:356:32）

执行此操作时，您正在替换原始dbUser对象：

var dbUser = new gmailUser;

dbUser = {
                displayName: '1profile.displayName',
                emails: [{value: '1profile.emails'}] ,
                name: { familyName: '1profile.familyName',
                givenName: '1profile.givenName' }
}

您可以通过执行以下操作来单独更新字段：

dbUser.displayName = '1profile.displayName';
dbUser.emails = [{value: '1profile.emails'}];
dbUser.name = { familyName: '1profile.familyName' };
dbUser.givenName = '1profile.givenName';