猫鼬-nodejs-由于某种原因没有方法 [英] mongoose - nodejs - has no method for some reason

问题描述

有一些问题！

错误是

local: 
  { password: '$2a$08$kSflSzcciqWN78nfqAu/4.ZBZaXkqb19bEypeWcuSxg89yPNuijYO',
    email: '***@gmail.com' } } has no method 'usersCharacters'

但是它确实有方法！ 我不确定它是否可以正确导出.据我所知，我在执行此操作的方式与用户使用的其他方法类似，只是在这里似乎不起作用.

But it does have the method! I am not sure it is being exported properly. As far as I can tell I am doing it similarly to the other methods users have except here it doesn't seem to work.

user.js模型文件

user.js model file

....
module.exports = mongoose.model('User', UserSchema);

var User = mongoose.model('User', UserSchema);


/* method works :D ! -- not sure if over complicated though! */
UserSchema.methods.usersCharacters = function(email,cb){
  User.findOne( {'local.email' : email }).exec(function(err, user){
    if (err) console.log("shit");
    var _return = [];

    user.characters.forEach(function(err, i){
      Character.findOne({ "_id" :user.characters[i] }).exec(function(err2, dude){
        _return.push(dude);

        /* Can't think of a smarter way to return :( */
        if ( i == user.characters.length-1)
          cb(_return);
      });
    });
  });
};

routes.js

routes.js

/* This doesn't work! I am wondering how I might be able to return this users characters -- 
 *
 * The error is here btw! TypeError: Cannot call method 'usersCharacters' of undefined -- line with character : ****
 */
app.get('/profile', isLoggedIn, function(req, res) {
    var mongoose = require('mongoose');
    var UserSchema = mongoose.model('User', UserSchema);
    console.log(UserSchema);
    // ERROR ON THIS LINE! : (
    characters : req.user.usersCharacters(req.user.email, function(_characters){ 
                   console.log("list of characters: " + _characters);
                   return _characters;
                   res.render('profile.ejs', {
                     user : req.user, // get the user out of session and pass to template
                     characters : characters
                   });

这是要点，其中包含我的更多模型文件代码:

here is a gist with more of my model file code:

https://gist.github.com/hassanshaikley/d4766251ec53feec8e84

推荐答案

从中创建User模型后添加到UserSchema 的方法，在模型实例.

Methods that you add to UserSchema after creating the User model from it, won't be available on User model instances.

因此，在创建User模型之前创建方法:

So create the method before creating the User model:

UserSchema.methods.usersCharacters = function(email,cb){ ... };

var User = mongoose.model('User', UserSchema);
module.exports = User;

在相关说明中，只有对mongoose.model('User', UserSchema)的第一次调用会处理该架构以创建'User'模型.随后的调用将忽​​略UserSchema参数并返回现有模型.

On a related note, only the first call to mongoose.model('User', UserSchema) processes the schema to create the 'User' model. Subsequent calls ignore the UserSchema parameter and return the existing model.

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