编译Mongoose后无法覆盖模型 [英] Cannot overwrite model once compiled Mongoose

问题描述

不知道我在做错什么，这里是我的check.js

Not Sure what I'm doing wrong, here is my check.js

var db = mongoose.createConnection('localhost', 'event-db');
db.on('error', console.error.bind(console, 'connection error:'));

var a1= db.once('open',function(){
var user = mongoose.model('users',{ 
       name:String,
       email:String,
       password:String,
       phone:Number,
      _enabled:Boolean
     });

user.find({},{},function (err, users) {
    mongoose.connection.close();
    console.log("Username supplied"+username);
    //doSomethingHere })
    });

这里是我的insert.js

and here is my insert.js

var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/event-db')

var user = mongoose.model('users',{
     name:String,
     email:String,
     password: String,
     phone:Number,
     _enabled:Boolean
   });

var new_user = new user({
     name:req.body.name,
     email: req.body.email,
     password: req.body.password,
     phone: req.body.phone,
     _enabled:false
   });

new_user.save(function(err){
    if(err) console.log(err); 
   });

每当我尝试运行check.js时，我收到这个错误

Whenever I'm trying to run check.js, I'm getting this error

一旦编译，就无法覆盖用户模型。

Cannot overwrite 'users' model once compiled.

我知道这个错误是由于模式不匹配，但我看不到这里发生了什么？我对于mongoose和nodeJS来说很新鲜。

I understand that this error comes due to mismatching of Schema, but I cannot see where this is happening ? I'm pretty new to mongoose and nodeJS.

这是我从MongoDB的客户端界面得到的：

Here is what I'm getting from the client interface of my MongoDB:

MongoDB shell version: 2.4.6 connecting to: test 
> use event-db 
  switched to db event-db 
> db.users.find() 
  { "_id" : ObjectId("52457d8718f83293205aaa95"), 
    "name" : "MyName", 
    "email" : "[e-mail]", 
    "password" : "myPassword", 
    "phone" : 900001123, 
    "_enable" : true 
  } 
>

推荐答案

发生错误是因为您已经定义了一个模式，然后再次定义该模式。一般来说，您应该做的是将模式实例化一次，然后在需要时将全局对象调用。

The error is occurring because you already have a schema defined, and then you are defining the schema again. Generally what you should do is instantiate the schema once, and then have a global object call it when it needs it.

例如：

user_model.js

user_model.js

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

var userSchema = new Schema({
   name:String,
   email:String,
   password:String,
   phone:Number,
   _enabled:Boolean
});
module.exports = mongoose.model('users', userSchema);          

check.js

var mongoose = require('mongoose');
var User = require('./user_model.js');

var db = mongoose.createConnection('localhost', 'event-db');
db.on('error', console.error.bind(console, 'connection error:'));
var a1= db.once('open',function(){
  User.find({},{},function (err, users) {
    mongoose.connection.close();
    console.log("Username supplied"+username);
    //doSomethingHere 
  })
});

insert.js

insert.js

var mongoose = require('mongoose');
var User = require('./user_model.js');

mongoose.connect('mongodb://localhost/event-db');
var new_user = new User({
    name:req.body.name
  , email: req.body.email
  , password: req.body.password
  , phone: req.body.phone
  , _enabled:false 
});
new_user.save(function(err){
  if(err) console.log(err); 
});

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