输出显示未定义

Question

model.js:

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

const CountryInfoSchema = new Schema({
    country_code:{type:String},
    country_name:{type:String},
    is_active:{type:Boolean},
    created_on:{ type: Date, default: Date.now },
    created_by:{type:String},
    updated_on:{ type: Date, default: Date.now },
    updated_by:{type:String}
});

module.exports =mongoose.model('country',CountryInfoSchema);


Controller.js:

const countryModel= require("./../userDetailsModels/country-info");

var createCountryDetails =(req,res) =>{
    var countryinfo = new countryModel(req.body);
    countryinfo.save()
        .then(info => {
            res.send({
                country_code:req.body.country_code,
                country_name:req.body.country_name,
                is_active:req.body.is_active,
                created_by:req.body.created_by,
                updated_by:req.body.updated_by,
                created_on:info.created_on,
                updated_on:info.updated_on,
                id:info._id
            });
        })
        .catch(err => {
            res.status(400).send({
                message:err
            });
        });

}


module.exports ={
    createCountryDetails: createCountryDetails,
}

在邮递员中，我测试了api

要求正文：

{
     "country_code":"IND",
    "country_name":"India",
   " is_active":true,
    "created_by":"SA",
    "updated_by":"SA"
}

像这样在下面获取输出

{
    "created_on": "2018-08-28T06:51:57.278Z",
    "updated_on": "2018-08-28T06:51:57.278Z",
    "id": "5b84f10d7ca3bf2654d6af39"
}

其他字段country_code显示未定义。我不知道哪里出了错误。调试时我得到所有字段都是未定义。我正在使用mongo db。在无法使用api创建数据之前，此代码已正常工作

我需要如下输出：

{
         "country_code":"IND",
        "country_name":"India",
       " is_active":true,
        "created_by":"SA",
        "updated_by":"SA",
        "created_on": "2018-08-28T06:51:57.278Z",
        "updated_on": "2018-08-28T06:51:57.278Z",
        "id": "5b84f10d7ca3bf2654d6af39"
    }