Mongoose populate 与多张表多级关联查询

async function getinfo (userid) {
    let postinfo,collectinfo;
    try {
        postinfo = await userModel.findOne({'userId':userid}).populate({path:'post',select:' -__v -visit -star -reply -anthorDesc -author '});
        collectinfo  = await userModel.findOne({'userId':userid}).populate({path:'collect',select:' -__v -visit -star -reply -anthorDesc -author '});
    } catch (error) {
        throw error
    }
    postinfo.collect = [];
    console.log(collectinfo.collect);
    postinfo.collect = postinfo.collect.concat(collectinfo.collect);
    return postinfo
}

查询一个用户的发帖与收藏帖子的情况

model如下

var userSchema = new Schema({
    "userId":{type:String},
    "name" : {type:String},
    "password" : {type:String},
    "email":{type:String},
    "intro":{type:String,default:'他还没有任何介绍!'},
    "avatar":{type:String,default:'userAvatar.png'},
    "collect":[{type:mongoose.Schema.Types.ObjectId,ref:'Post'}],
    "post":[{type:mongoose.Schema.Types.ObjectId,ref:'Post'}],
    "isAdmin":{type:Boolean,default:false},//判断是否为管理员
});

通过assign进行复制存在问题

用contact方法进行连接时，如果不清空被连接的数组，便不能得到正确的结果