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我尝试使用 mongoose-schema-extend 实现 mongoDB 子文档的继承，然后使用 mongoose 本身。基本要求是在继承类中定义附加属性并将它们放在 DB 上——这在两种方法中都可以正常工作。第二个要求是能够区分类型——使用 discriminatorType 和 instanceOf。discriminatorType 没有使用 mongoose-schema-extend 保存在 DB 中，仅直接使用 mongoose discriminator。instanceOf 在这两种情况下都不起作用（在 parentDocument.find 之后）- 口袋似乎只是对象。

猫鼬模式扩展的代码：

var PocketSchema = new mongoose.Schema({
    name: {type: String, unique: true , required: true}, //required - not working within array
    status: {type: String , enum :['ACTIVE','RETIRED'], Default:'ACTIVE' },
    limits : ['Limit']
},{ discriminatorKey : '_type' });

dbConn.model('Pocket', PocketSchema);

var CreditCardPocketSchema =dbConn.models.Pocket.schema.extend({
  PAN :  {type: String, required: true } 
});

dbConn.model('CreditCardPocket', CreditCardPocketSchema);

var customerSchema = mongoose.Schema({
    username: {type: String, unique: true, required: true } ,
    password: String,
    email: { type: String },
    status: {type: String , enum :['REGISTERED','ACTIVE','RETIRED'] , Default:'REGISTERED'},
    pockets : ['Pocket']
});

带有 util.extend 的猫鼬代码：

function PocketSchema() {          
mongoose.Schema.apply(this, arguments);         
this.add({                             
    name: {type: String, unique: true , required: true},//required - not working within array
    status: {type: String , enum :['ACTIVE','RETIRED'], Default:'ACTIVE' },
    limits : ['Limit']
});                                    
};      
util.inherits(PocketSchema, mongoose.Schema);
var pocketSchema = new PocketSchema();

dbConn.model('Pocket', pocketSchema);

var CreditCardPocketSchema = new PocketSchema({
    PAN :  {type: String, required: true } 
});

dbConn.models.Pocket.discriminator('CreditCardPocket', CreditCardPocketSchema);

**检查instanceOf的代码：**

exports.showPockets = function(req, res){
var username = req.params.username;

dbConn.models.Customer.findOne({username:username},function(err,user) {
    if (user === null) {
        res.send('user does not exist');
    }else {
        user.pockets[0] instanceof dbConn.models.CreditCardPocket;
        user.pockets[0] instanceof dbConn.models.Pocket;

        dbConn.models.Pocket.prototype.isPrototypeOf(user.pockets[0]);
        dbConn.models.SVAPocket.prototype.isPrototypeOf(user.pockets[0]);
    }
});
};

mongoose-schema-extend 鉴别器对子文档不能正常工作吗？例如，这不应该返回 true 吗？

提前致谢。

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