public function getMessageQueue()
	{
		// For empty queue, if messages exists in the session, enqueue them.
		if (!count($this->_messageQueue)) {
			$session = JFactory::getSession();
			$sessionQueue = $session->get('application.queue');

			if (count($sessionQueue)) {
				$input = new JInput();
				$rand_token = $input->get('rand_token');
				if(!$rand_token) {
					$uri =& JURI::getInstance();
					$query = $uri->getQuery(1);
					$query['rand_token'] = md5(rand());
					$uri->setQuery($query);
					$unique_url = $uri->toString( );
					header('Location: '.$unique_url);
					exit;
				}
				$this->_messageQueue = $sessionQueue;
				$session->set('application.queue', null);
			}
		}

		return $this->_messageQueue;
	}

This code is adding rand_token parameter to url every time system message is generated, so it makes url unique and joomla cache will not use it again.
Hope this will help you with your joomla system messages issue.

	$user_obj =& JFactory::getUser();
	if(!isset($user_obj->groups['Super Users'])) {
		return;
	}
		$input = new JInput();
		$option = $input->get('option');
		$view = $input->get('view');
		$layout = $input->get('layout');
		$id = $input->get('id');
		$Itemid = $input->get('Itemid');
		$query_string = http_build_query(JRequest::get( 'get' ));

		if(
			($option == 'com_media' && $view == 'imagesList')
			|| ($option == 'com_media' && $view == 'images')
			|| ($option == 'com_content' && $view == 'articles' && $layout == 'modal')
			|| ($option == 'com_content' && $view == 'article' && $layout == 'pagebreak')
		) {
			return;
		}
?>
<div>
	<p style="font-size: 24px;">
		Query: <?php echo $query_string;?>
		<br> Component: <?php echo $option;?>
		<br> View: <?php echo $view;?>
		<br> Layout: <?php echo $layout;?>
		<br> ID: <?php echo $id;?>
		<br> Menu item id: <?php echo $Itemid;?>
	</p>
</div>

This solution will help you find out menu id or article id or any other information that is hidden by SEF URL for any page when using default joomla SEF or any components for joomla SEF URLs like sh404SEF.

So, let’s start!

- First, download and install Codeigniter( I will be using Codeigniter 2.1.0 in this tutorial ). Make sure that you set your database connection settings in /application/config/database.php and included ‘database’ to list of libraries that will be autoloaded in /application/config/autoload.php , we will also need ‘url’ helper, so please add it to autoload as well.
- Download Data manager library, extract contents of archive in your root folder and rename extracted folder to say ‘data_manager’.
- Replace /data_manager/params.php with one from this archive. It will make Data manager retrieve database connection settings and daseurl from Codeigniter config files.
- Next step is creating Data manager profile file which will tell Data manager what exactly we need to do. For our ‘products’ db table, let’s create a /data_manager/profiles/products_admin.php profile file with following contents:

<?php
$table = 'products';

$fields = array (
	array (
		'name' => 'id'
		, 'type' => 'key'
		, 'title' => 'ID'
	)
	, array (
		'name' => 'productCode'
		, 'type' => 'input'
		, 'title' => 'Code'
	)
	, array (
		'name' => 'productName'
		, 'type' => 'input'
		, 'title' => 'Name'
		, 'is_link' => 1
		, 'link' => '/products/edit/*'
	)
	, array (
		'name' => 'category_id'
		, 'type' => 'lookup'
		, 'title' => 'Category'
		//lookup field specific parameters
		, 'lookup_table' => 'categories'
		, 'key_field' => 'id'
		, 'values_field' => 'title'
	)
	, array (
		'name' => 'productScale'
		, 'type' => 'list'
		, 'title' => 'Scale'
		, 'items' => array(
			"1:10" => "1:10( minimal )"
			, "1:12" => "1:12( tiny )"
			, "1:18" => "1:18( average )"
			, "1:24" => "1:24( big )"
			, "1:32" => "1:32( maximal )"
		)
		, 'list_mode' => 0
	)
	, array (
		'name' => 'productDescription'
		, 'type' => 'textarea'
		, 'title' => 'Description'
		, 'rows' => 5
		, 'cols' => 60
		, 'list_mode' => 0
	)
	, array (
		'name' => 'buyPrice'
		, 'type' => 'input'
		, 'title' => 'Price'
		, 'css_class' => 'product_price'
	)

	, array (
		'name' => 'is_active'
		, 'type' => 'check'
		, 'title' => 'Is active'
	)
	, array (
		'name' => 'managing'
		, 'type' => 'managing'
		, 'title' => 'Actions'
		, 'delete_link' => '/products/delete/*'
		, 'edit_link' => '/products/edit/*'
		, 'non_db' => 1
		, 'single_mode' => 0
	)
);

Variable $table is telling Data manager that we will be working with ‘products’ db table.
Variable $fields is array of fields that will be used for our admin panel. What each field does you can see from result, parameters are mostly self-explanatory, but you can also look at detailed explanation of Data manager fields parameters.

- Next step is to create controller and views. Download archive with sample controller and views and extract it to /application folder.
- Rename controller file and folder inside views folder from ‘sample_controller’ to a name of controller that you want to use. In out case let’s use controller name ‘products’.
After that open controller file ( /application/controllers/products.php ), rename controller class name to ‘Products’ and change value for class variable $dm_profile to our Data manager profile name ( ‘products_admin’ ) to make it look like this:

<?php
include_once BASEPATH.'../data_manager/DataManager.php';

class Products extends CI_Controller {
	private $dm_profile = 'products_admin';
	private $controller = '';
...

And that’s it!!!

You asking “Soooo easy?” – Yes, so easy!

So if you access http://your_domain/products you will see something like this:

And if you click ‘Edit’ link in front of any item, or item title you will see this:

Here you can download complete sources of this demo project with a database.
You can change controllers and views files to make this admin panel look and work more like you want it to look, it is just a demo that shows basic usage of Data manager library.
So keep in touch with new tutorials and new versions of Data manager.

How it works?

-First, you need to download Data manager library.
-Put it anywhere on your server – it can be root or /libraries directory or any other.
-Assign database connection information in /data_manager/params.php
For example:

<?php
define('DM_DB_HOST', 'localhost');
define('DM_DB_NAME', 'db_name');
define('DM_DB_USER', 'db_user');
define('DM_DB_PASS', 'db_user_pass');

define('DM_BASE_URL', 'http://mydomain.com/');

-Then you will need to create Data manager profile, which will tell Data manager what each field in you database table do.
Create a file with a name of your profile with php extension ( for example “employees.php” ) inside /data_manager/profiles/ folder.
Sample code for employees.php profile can look like this:

<?php
$table = 'employees';

$fields = array (
	array (
		'name' => 'employeeNumber'
		, 'type' => 'key'
		, 'title' => 'ID'
	)
	, array (
		'name' => 'firstName'
		, 'type' => 'input'
		, 'title' => 'First name'
		, 'is_link' => 1
		, 'link' => '/index.php?page=edit_employee&id=*'
	)
	, array (
		'name' => 'lastName'
		, 'type' => 'input'
		, 'title' => 'Last name'
		, 'is_link' => 1
		, 'link' => '/index.php?page=edit_employee&id=*'
	)
	, array (
		'name' => 'officeCode'
		, 'type' => 'lookup'
		, 'title' => 'Office'
		//lookup field specific parameters
		, 'lookup_table' => 'offices'
		, 'key_field' => 'officeCode'
		, 'values_field' => 'addressLine1'
	)
	, array (
		'name' => 'email'
		, 'type' => 'input'
		, 'title' => 'E-mail'
	)
	, array (
		'name' => 'is_contractor'
		, 'type' => 'check'
		, 'title' => 'Is contractor'
	)
	, array (
		'name' => 'jobTitle'
		, 'type' => 'input'
		, 'title' => 'Job title'
		, 'list_mode' => 0
	)
	, array (
		'name' => 'managing'
		, 'type' => 'managing'
		, 'title' => 'Actions'
		, 'delete_link' => '/index.php?page=delete_employee&id=*'
		, 'edit_link' => '/index.php?page=edit_employee&id=*'
		, 'non_db' => 1
		, 'single_mode' => 0
	)
);

Variable $table should be assigned to name of your database table that you need to create admin panel for.
Variable $fields is an array of fields, that will be used to display data.
As you can see each field have few mandatory parameters such as name, type and title. There are also other parameters that may be applied for fields of specific type or field of any type.
You can also look at detailed explanation of Data manager fields parameters.

-In your php code you will need to include Data manager class file to use it, for example:

include_once $_SERVER["DOCUMENT_ROOT"].'/data_manager/DataManager.php';

-Next step is to add calls of proper Data manager functions inside your php code to make it work.
For showing list of items from db table:

	$page = 1;
	$dm = new DataManager('employees');
	$dm->setItemsPerPage(7);
	$dm->setPage($page);
	$dm->setMode('list');
	$dm->setOrderingField('employeeNumber');
	if ($dm->loadData() === false) {
		var_dump($dm->getErrors());
		exit;
	}
	$titles = $dm->getTitles();
	$fields = $dm->getFields();

After executing this code variable $titles will contain array of titles of fields to display and variable $fields will contain array, each item of which will contain an html code for a field.
Then you can use code similar to this to display table with list of db table rows.

<table border="1">

	<tr>
<?php foreach($titles as $title) { ?>
		<td><?php echo $title; ?></td>
<?php } ?>
	</tr>

<?php foreach($fields as $row) { ?>
	<tr>
<?php 	foreach($row as $field) { ?>
		<td><?php echo $field; ?></td>
<?php 	} ?>
	</tr>
<?php } ?>

</table>

Then as follows, you can use this code for showing list of fields for editing or creating single db table row:

	$id = (int) (isset($_GET['id'])?$_GET['id']:0);
	$dm = new DataManager('employees');
	if ($id) {
		$dm->setKeyValue($id);
	}
	$dm->setMode('single');
	if ($dm->loadData() === false) {
		var_dump($dm->getErrors());
		exit;
	}
	$titles = $dm->getTitles();
	$fields = $dm->getFields();
	$fields = $fields[0];

As you can see, code is very similar, but this time we need to set ‘single’ instead of ‘list’ mode and assign db table id value to get proper row.
Code for inserting/updating/deleting data is even easier:

	//inserting/updating row
	$data = $_POST;
	$dm = new DataManager('employees');
	if ($dm->save($data) === false) {
		var_dump($dm->getErrors());
		exit;
	}

	//deleting row
	$id = (int) (isset($_GET['id'])?$_GET['id']:0);
	$dm = new DataManager('employees');
	if ($dm->delete($id) === false) {
		var_dump($dm->getErrors());
		exit;
	}

On the internet you can find some cool designs for your admin panel and make it look better, Data manager will take care of the rest!
Soon I will post more tutorials for advanced usage of Data manager and explanation of Data manager fields.
So keep in touch!