express框架中调用render()出现栈溢出问题

[pikzhang]

//控制台报错信息
RangeError: Maximum call stack size exceeded
at Buffer.get [Symbol.toStringTag] ()
at Buffer.toString ()
at toType (C:\Users\piCzhang\Desktop\project_blog\node_modules\art-template\lib\compile\adapter\extend.js:7:47)
at extend (C:\Users\piCzhang\Desktop\project_blog\node_modules\art-template\lib\compile\adapter\extend.js:20:16)
at extend (C:\Users\piCzhang\Desktop\project_blog\node_modules\art-template\lib\compile\adapter\extend.js:31:33)
at extend (C:\Users\piCzhang\Desktop\project_blog\node_modules\art-template\lib\compile\adapter\extend.js:31:33)
at extend (C:\Users\piCzhang\Desktop\project_blog\node_modules\art-template\lib\compile\adapter\extend.js:31:33)
at extend (C:\Users\piCzhang\Desktop\project_blog\node_modules\art-template\lib\compile\adapter\extend.js:31:33)
at extend (C:\Users\piCzhang\Desktop\project_blog\node_modules\art-template\lib\compile\adapter\extend.js:31:33)
at extend (C:\Users\piCzhang\Desktop\project_blog\node_modules\art-template\lib\compile\adapter\extend.js:31:33)
at extend (C:\Users\piCzhang\Desktop\project_blog\node_modules\art-template\lib\compile\adapter\extend.js:31:33)
at extend (C:\Users\piCzhang\Desktop\project_blog\node_modules\art-template\lib\compile\adapter\extend.js:31:33)
at extend (C:\Users\piCzhang\Desktop\project_blog\node_modules\art-template\lib\compile\adapter\extend.js:31:33)
at extend (C:\Users\piCzhang\Desktop\project_blog\node_modules\art-template\lib\compile\adapter\extend.js:31:33)
at extend (C:\Users\piCzhang\Desktop\project_blog\node_modules\art-template\lib\compile\adapter\extend.js:31:33)
at extend (C:\Users\piCzhang\Desktop\project_blog\node_modules\art-template\lib\compile\adapter\extend.js:31:33)

//问题描述
只有在使用populate进行多表联查才会出现这个问题，但是把主表里面的_id字段过滤掉就不会出现这个问题

//异常代码段

 const Article = require('../../model/article');
const dateFormat = require('dateformat');
const Comment = require('../../model/comment');
module.exports = async (req,res)=>{
   let article = await Article.findOne({_id:req.query.id});
   let comments = await Comment.find({aId:req.query.id}).populate('uid').lean();
  
   
  
    console.log({comments})
    res.render('home/article',{"article":article, "comments":{comments}}); //这里出错
 
}

//使用的模型Article

 const mongoose = require('mongoose');
const commentSchema = new mongoose.Schema({
 uid:{
        type:mongoose.Schema.Types.ObjectId,
        ref:'User',
        required:true
    },
    date:{
        type:Date,
        default:Date.now(),
        required:true
     },
    aId:{
        type:mongoose.Schema.Types.ObjectId,
        ref:'Article',
        required:true
    },
    content:String
});
const Comment = mongoose.model('comment',commentSchema);
module.exports = Comment;

//联查使用的模型User

const mongoose = require('mongoose');
const Joi = require('joi');

const userSchema = new mongoose.Schema({
   username: {
       type: String,
       required: true,
       minlength: 2,
       maxlength: 20
   },
   email: {
       type: String,
       unique: true,
       required: true
   },
   password: {
       type: String,
       required: true
   },
   role: {
       type: String,
       required: true

   },
   //0表示不启用，1表示启用
   state: {
       type: Number,
       default: 0
   }



});
const User = mongoose.model('User', userSchema);

const validateUser = (user) => {
   const schema = Joi.object({
       username: Joi.string()
           .alphanum()
           .min(3)
           .max(30)
           .required().error(new Error('用户名不符合规范')),

       password: Joi.string()
           .pattern(new RegExp('^[a-zA-Z0-9]{3,30}$')).error(new Error('密码不符合规范')),
       role: Joi.string()
           .pattern(new RegExp('(^admin$|^normal$)')).error(new Error('角色不符合规范'))
       ,
       state: Joi.string()
           .pattern(new RegExp('0|1')).error(new Error('状态不符合规范')),

       email: Joi.string()
           .email({ minDomainSegments: 2, tlds: { allow: ['com', 'net'] } }).error(new Error('邮箱不符合规范'))
   });
   return schema.validate(user);
}


module.exports = {
   User,
   validateUser
}

[ghost]

我也遇到这个问题，请问解决了吗？我暂时是过滤_id

[ghost]

mongoose版本过高导致的，我写的版本是：
"mongoose": "^ 5.4.0", 前面的 ^ 符号，npm install 的时候实际安装的是最高5.10.0 ，我降级写 5.4.0 就不报错了

package.json文件：

"dependencies": {
"mongoose": "5.4.0",
}

[pikzhang]

好的学习了，谢谢，网上还有一种方法是把Mongo对象转成普通对象，说是mongo对象内部维护的信息太多了导致爆栈，试过了这样确实没问题，不过应该还是是环境的问题，因为我的数据量非常非常低不至于爆掉栈空间

[cpeng2019]

好的学习了，谢谢，网上还有一种方法是把Mongo对象转成普通对象，说是mongo对象内部维护的信息太多了导致爆栈，试过了这样确实没问题，不过应该还是是环境的问题，因为我的数据量非常非常低不至于爆掉栈空间

谢谢! 我找了很久, 最后用你说的转对象的方法解决了, 先用了 JSON.stringify() 转成字符串, 再用了 JSON.parse() 转回对象.