Mongoose mongo模块导出问题，节点js中存在交叉引用文件

我有两个文件Stats.js和Stock.js。这两个文件都需要访问其他文件，所以我必须在Stats中添加require（Stock），反之亦然。但是，在Stats.js中执行createstats（）时，它会给出aggregate不是一个现成的函数。当我发表评论时，问题并不存在

**var Stats=require（'../Stats'）；Stock.js中的行**

如何克服这个问题。请帮忙。谢谢

文件1:Stats.js

---

文件2:Stock.js

---

这是我解决问题的唯一方法。我又添加了一个名为Schemas.js的文件，如下所示

Schemas.js 然后更新文件1和文件2，如下所示

stats.js stock.js

var mongoose     = require('mongoose');
var Stock    = require('../Stock');
var logger   = require('../../util/log');
var Schema  = mongoose.Schema;
var StatsSchema   = new Schema({
    item:String,
    pqty:Number,
    sqty:Number,
    date:Date,
});


function createstats () {

    Stock.aggregate([

    .....
    .....
    ])
}
module.exports = mongoose.model('Stats', StatsSchema);

    var mongoose     = require('mongoose');    
    var Stats    = require('../Stats');
    var logger   = require('../../util/log');
    var Schema       = mongoose.Schema;    

    var StockSchema   = new Schema({
     supplier:String,
     name:Number,
     rate:Number,
     date:Date,   
    });

    function updateqty () {
        Stats.update(

        .....
        .....
        )
    }
    module.exports = mongoose.model('Stock', StockSchema);

 var mongoose     = require('mongoose');    
    var Stats    = require('../Stats');
    var logger   = require('../../util/log');
    var Schema       = mongoose.Schema;    

    var StockSchema   = new Schema({
     supplier:String,
     name:Number,
     rate:Number,
     date:Date,   
    });

var StatsSchema   = new Schema({
    item:String,
    pqty:Number,
    sqty:Number,
    date:Date,
});



module.exports = {
    StatsSchema:StatsSchema,
    StockSchema:StockSchema,
};

 var mongoose     = require('mongoose');
    var logger   = require('../../util/log');

    var modelSchemas = require('../Schemas');
    var StatsSchema=modelSchemas.StatsSchema;
    var StockSchema=modelSchemas.StockSchema;
    Stock = mongoose.model('Stock', StockSchema);
    Stats = mongoose.model('Stats', StatsSchema);


    function createstats () {

        Stock.aggregate([

        .....
        .....
        ])
    }
    module.exports = mongoose.model('Stats', StatsSchema);

var mongoose     = require('mongoose');    
    var logger   = require('../../util/log');

var modelSchemas = require('../Schemas');
var StatsSchema=modelSchemas.StatsSchema;
var StockSchema=modelSchemas.StockSchema;

Stock = mongoose.model('Stock', StockSchema);
Stats = mongoose.model('Stats', StatsSchema);

    function updateqty () {
        Stats.update(

        .....
        .....
        )
    }
    module.exports = mongoose.model('Stock', StockSchema);