如果我的模型中有Schema.ObjectId，那么如何列出行的所有元素（类似于MYSQL）？

I have 2 schemas:

我有2个架构:

var mongoose = require('mongoose');  
var Schema = mongoose.Schema;

var companySchema= new Schema({  
    name: String,
    country: String       
});

module.exports = mongoose.model('Company', companySchema); 
var mongoose = r