貓鼬種群與對(duì)象嵌套使用貓鼬種群直接包含對(duì)象？什么時(shí)候應(yīng)該分別使用？貓鼬種群的例子：var personSchema = Schema({
_id : Number,
name : String,
stories : [{ type: Schema.Types.ObjectId, ref: 'Story' }]});var storySchema = Schema({
_creator : { type: Number, ref: 'Person' },
title : String,});貓鼬對(duì)象嵌套示例：var personSchema = Schema({
_id : Number,
name : String,
stories : [storySchema]});var storySchema = Schema({
_creator : personSchema,
title : String,});
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