Laravel Sentry User Model with Relationship - php

Question

I have a User Model:
use Cartalyst\Sentry\Users\Eloquent\User as SentryModel;
class User extends SentryModel {
public function raspberries() {
return $this->hasMany('Raspberry');
}
}
And a SentryModel:
<?php
use Illuminate\Auth\UserInterface;
use Illuminate\Auth\Reminders\RemindableInterface;
class SentryModel extends Eloquent implements UserInterface, RemindableInterface {
/**
* The database table used by the model.
*
* #var string
*/
protected $table = 'users';
/**
* The attributes excluded from the model's JSON form.
*
* #var array
*/
protected $hidden = array('password');
/**
* Get the unique identifier for the user.
*
* #return mixed
*/
public function getAuthIdentifier()
{
return $this->getKey();
}
/**
* Get the password for the user.
*
* #return string
*/
public function getAuthPassword()
{
return $this->password;
}
/**
* Get the e-mail address where password reminders are sent.
*
* #return string
*/
public function getReminderEmail()
{
return $this->email;
}
}
And a Rasberry Model:
class Raspberry extends Eloquent{
# Relations
public function user(){
return $this->belongsTo('User');
}
}
And now I want select all Rasberries from my logged user:
$data = Sentry::getUser()->raspberries()->paginate(10);
But this doesn't work, I got error Message:
BadMethodCallException
Call to undefined method
Illuminate\Database\Query\Builder::raspberries()
Why?