Error 'Object has no method xxx ' while using Mongoose

Question

I am trying to use Mongoose for connecting MongoDB with Nodejs . I have my code as below. When I am trying to do a GET/POST via api/users I get the Error ``` TypeError: Object function model(doc, fields, skipId) { [08/14 21:28:06 GMT+0800] if (!(this instanceof model)) [08/14 21:28:06 GMT+0800] return new model(doc, fields, skipId); [08/14 21:28:06 GMT+0800] Model.call(this, doc, fields, skipId); [08/14 21:28:06 GMT+0800] } has no method 'list' ``` Can someone please explain what I am doing wrong ? I had to split my code into different files because I have a lot of functions and I dont want to mess them either my app.js or index/routes.js app.js ``` //database connection mongoose.connect('....'); var db = mongoose.connection; db.on('error', console.error.bind(console, 'connection error:')); db.once('open', function callback () { console.log("Conncection Success !"); }); users_module= require('./custom_modules/users.js'); users_module.init_users(); ... app.get('/api/users',user.list);…

Accepted Answer

The `methods` property of a `model` object in Mongoose is used to add functions to instances of model objects. So, in your code, the function `list` is added to an instance of `UserModel`. If you instead want to have a `static` like singleton function, then you could add it directly to the `UserModel` object returned by the call to `mongoose.model('UserModel', userModelSchema);`:

```
UserModel.list = list;
```

Now, you can call it to return the list of all users.

Note that it's still an asynchronous function though. So, you can't just return the results of calling the function, as it will be empty normally. `find` is async, so your `list` function also needs to accept a callback that can be called when the list has been returned:

```
UserModel.list(function(list) {
   res.render(list);
});
```

Error 'Object has no method xxx ' while using Mongoose

Solution

Problem