Magento Model is not Working

I am following this tutorial http://www.magentocommerce.com/knowledge-base/entry/magento-for-dev-part-5-magento-models-and-orm-basics.

As per this tutorial,when i pass a value with url like(http://localhost/dev/weblog/index/testModel/id/1), I am getting error like this

Fatal error: Call to a member function load() on a non-object in app\code\local\Srivats\Weblog\controlle开发者_Python百科rs\IndexController.php on line 10

This is my index controller code

<?php
class Srivats_Weblog_IndexController extends Mage_Core_Controller_Front_Action
{
    public function testModelAction()
    {
        $params = $this->getRequest()->getParams();
        $blogpost = Mage::getModel('weblog/blogpost');
        echo("Loading the blogpost with an ID of ".$params['id']);
        $blogpost->load($params['id']);
        $data = $blogpost->getData();
        var_dump($data);
    }
}

Blogpost.php file

<?php
class Srivats_Weblog_Model_Mysql4_Blogpost extends Mage_Core_Model_Mysql4_Abstract
{
    protected function _construct()
    {
        $this->_init('weblog/blogpost','blogpost_id');
    }
}

Here is my config file

<?xml version="1.0" encoding="utf-8"?>
        <config>
            <global>
                <modules>
                    <srivats_weblog>
                        <version>1.0.0</version>
                    </srivats_weblog>
                </modules>
                <models>
                    <weblog_mysql4>
                        <class>Srivats_Weblog_Model_Mysql4</class>
                        <resourceModel>weblog_mysql4</resourceModel>
                    </weblog_mysql4>
                </models>
            </global>
            <frontend>
                <routers>
                    <weblog>
                        <use>standard</use>
                        <args>
                            <module>Srivats_Weblog</module>
                            <frontName>weblog</frontName>
                        </args>
                    </weblog>
                </routers>
            </frontend>
        </config>

system.log shows

Warning: include() [function.include]: Failed opening 'Mage\Weblog\Model\Blogpost.php' for inclusion (include_path='app\code\local;E:\dev\app\code\community;app\code\core;E:\dev\lib;.;C:\php\pear') in lib\Varien\Autoload.php on line 93

Here is the link to all files https://gist.github.com/cf99e4277599954f38d4 I think this line $blogpost->load($params['id']); causing trouble.What i am missing.Any pointers?

---

Ahh in you config you should have

<global>
    <models>
        <weblog>
            <class>Srivats_Weblog_Model</class>
            <resourceModel>weblog_mysql4</resourceModel>
        </weblog>
    </model>
</global>

you already have for mysql4 resource add this on top of that. You should have

            <models>
                <weblog>
                  <class>Srivats_Weblog_Model</class>
                  <resourceModel>weblog_mysql4</resourceModel>
                </weblog>
                <weblog_mysql4>
                    <class>Srivats_Weblog_Model_Mysql4</class>
                </weblog_mysql4>
            </models>

---

Your real problem is that the line:

$blogpost = Mage::getModel('weblog/blogpost');

Is not returning an object and so $blogpost is just NULL.

Is the blogpost model class file actually created in app/code/local/Srivats/Weblog/Model/Blogpost.php