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Thursday, 27 November 2014

create magento extension from scratch

create magento extension from scratch , create magento module,create magento module online,create magento module with database


Magento Developper’s Guide (Lesson 1) – Magento plugins structure

Basic knowledge:
Before you venture into magento, check that you have already a solid foundation in programming.
prerequisite for developing Magento are:
- Have already installed Magento.
- Know what the MVC pattern.
- Know the object-oriented PHP (and PHP of course …)
- How does the whole template magento
You have the first 2 but do not have the 3rd, go to: magento designer’s guide

The structure of a Magento module

In a magneto module there are 2 parties, the « code » and « templates ».
code determines the actions that the module will be able to achieve the interraction with the database etc … while templates are just the layout of the data sent by code.
Magento, the two parties will be placed at two different locations.
your « code » will be in
/app/code/local/monNameSpace/monNomDeModule/
while the « template » of the module will be in:
/app/design/frontend/monRepertoiredeTemplates/monTemplate (for the frontend)
And
/app/design/adminhtml/monRepertoiredeTemplates/monTemplate (for the backend)
The « code » of my template will contain the following elements:
the structure of a module magento
Block : Where you go to the « controller » of your block
Controllers: the controllers of your module
Models: Performers of your module
Helper: of your helpers module
etc: the configuration of your module
sql: SQL query to execute to create your module during the instalation

Summary :

Lesson 1 – Magento plugin’s structure
Lesson 2 – Create your own controller
Lesson 3 – Create a block
Lesson 4 – The Model and the database
Lesson 5 – The Model, collections and forms
Lesson 6 – Create a plugin in the backend
Lesson 7 – The magento admin grid
Lesson 8 – Rewrite / modify a magento block
Lesson 9 – Rewrite / modify a magento model
Lesson 10 – Rewrite / modify a magento controller
Lesson 11 – Events and Observers in magento
Lesson 12 – The Helpers
Lesson 14 – Make an update of your plugin
Lesson 15 – Translate your Magento plugin, the Internationalization
Step by step,



http://navaneeth.me/creating-magento-extension-with-custom-database-table/#.VHeOTWfI2ZQ
Let’s setup our directory structure:
/app/code/local/<Namespace>/<Module>/
Block/
controllers/
etc/
Model/
    Mysql4/
        <Module>/
sql/
    <module>_setup/
/app/design/frontend/<interface>/<theme>/
 
template/
    <module>/

Activate Module

Magento requires there to be an XML file that tells Magento to look for and use your custom module.
/app/etc/modules/<Namespace>_<Module>.xml
<?xml version="1.0"?>
<config>
    <modules>
        <[Namespace]_[Module]>
            <active>true</active>
            <codePool>local</codePool>
        </[Namespace]_[Module]>
    </modules>
</config>
Also you can disable your module in the Configuration menu on the backend via the Advanced tab.
NOTE: Due to a bug in Magento, whitespace is not treated correctly. This means that if you leave space in the values between node names (anything in angled brackets <> is a node), Magento will break.
As an explanation of the above code you will see that all you are changing is the [Namespace]_[Module] text and leaving everything else the same. Please note the capital P in codePool. If this is lowercase this module will not be active.

Create Controller

/app/code/local/<Namespace>/<Module>/controllers/IndexController.php
<?php
class <Namespace>_<Module>_IndexController extends Mage_Core_Controller_Front_Action
{
    public function indexAction()
    {
            $this->loadLayout();
            $this->renderLayout();
    }
}
NOTE: You may notice that there is no closing, ?>, PHP tag in the code. This is a common coding style that Magento core classes use. Magento Coding Standard is similar (with some exceptions) to Zend Framework PHP Coding Standard and you can find the detailed explanations of this rule in Zend Framework Documentation

Create Configuration XML

/app/code/local/<Namespace>/<Module>/etc/config.xml
<?xml version="1.0"?>
<config>
    <modules>
        <[Namespace]_[Module]>
            <version>0.1.0</version>
        </[Namespace]_[Module]>
    </modules>
    <frontend>
        <routers>
            <[module]>
                <use>standard</use>
                <args>
                    <module>[Namespace]_[Module]</module>
                    <frontName>[module]</frontName>
                </args>
            </[module]>
        </routers>
        <layout>
            <updates>
                <[module]>
                    <file>[module].xml</file>
                </[module]>
            </updates>
        </layout>
    </frontend>  
    <global>
        <models>
            <[module]>
                <class>[Namespace]_[Module]_Model</class>
                <resourceModel>[module]_mysql4</resourceModel>
            </[module]>
            <[module]_mysql4>
                <class>[Namespace]_[Module]_Model_Mysql4</class>
                <entities>
                    <[module]>
                        <table>[module]</table>
                    </[module]>
                </entities>
            </[module]_mysql4>
        </models>
        <resources>
            <[module]_setup>
                <setup>
                    <module>[Namespace]_[Module]</module>
                </setup>
                <connection>
                    <use>core_setup</use>
                </connection>
            </[module]_setup>
            <[module]_write>
                <connection>
                    <use>core_write</use>
                </connection>
            </[module]_write>
            <[module]_read>
                <connection>
                    <use>core_read</use>
                </connection>
            </[module]_read>
        </resources>
        <blocks>
            <[module]>
                <class>[Namespace]_[Module]_Block</class>
            </[module]>
        </blocks>
        <helpers>
            <[module]>
                <class>[Namespace]_[Module]_Helper</class>
            </[module]>
        </helpers>
    </global>
</config>
NB : You can use the frontName of your choice without any link to your module name. IE : Mage_Catalog could have “mycatalog” as a frontName.

Create Helper

/app/code/local/<Namespace>/<Module>/Helper/Data.php
<?php
  
class <Namespace>_<Module>_Helper_Data extends Mage_Core_Helper_Abstract
{
  
}

Create Models

If you are quite new to Magento you should pay attention to one of its specifics! The Constructors below are not the usual PHP-Constructors!! Keeping that in mind can save hours of frustrating crashes ;)
/app/code/local/<Namespace>/<Module>/Model/<Module>.php
<?php
  
class <Namespace>_<Module>_Model_<Module> extends Mage_Core_Model_Abstract
{
    public function _construct()
    {
        parent::_construct();
        $this->_init('<module>/<module>');
    }
}
/app/code/local/<Namespace>/<Module>/Model/Mysql4/<Module>.php
<?php
  
class <Namespace>_<Module>_Model_Mysql4_<Module> extends Mage_Core_Model_Mysql4_Abstract
{
    public function _construct()
    {  
        $this->_init('<module>/<module>', '<module>_id');
    }
}
NOTE: The ‘_id’ refers to the PRIMARY KEY in your database table.
/app/code/local/<Namespace>/<Module>/Model/Mysql4/<Module>/Collection.php
<?php
  
class <Namespace>_<Module>_Model_Mysql4_<Module>_Collection extends Mage_Core_Model_Mysql4_Collection_Abstract
{
    public function _construct()
    {
        //parent::__construct();
        $this->_init('<module>/<module>');
    }
}

SQL Setup

/app/code/local/<Namespace>/<Module>/sql/<module>_setup/mysql4-install-0.1.0.php
<?php
  
$installer = $this;
  
$installer->startSetup();
  
$installer->run("
  
-- DROP TABLE IF EXISTS {$this->getTable('<module>')};
CREATE TABLE {$this->getTable('<module>')} (
  `<module>_id` int(11) unsigned NOT NULL auto_increment,
  `title` varchar(255) NOT NULL default '',
  `content` text NOT NULL default '',
  `status` smallint(6) NOT NULL default '0',
  `created_time` datetime NULL,
  `update_time` datetime NULL,
  PRIMARY KEY (`<module>_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
  
    ");
  
$installer->endSetup();
NOTE: Please note the text that needs to be replaced. This SQL structure is up to you, this is merely a starting point.
Note Important: If you add fields and couldn’t save data in these fields please try to go to System→Cache Management Then 1.Flush Cache Storage 2.Flush Magento Cache.

Template Design

/app/design/frontend/<interface>/<theme>/layout/<module>.xml
<?xml version="1.0"?>
<layout version="0.1.0">
    <[module]_index_index>
        <reference name="content">
            <block type="[module]/[module]" name="[module]" />
        </reference>
    </[module]_index_index>
</layout>
NOTE: The block type will automatically figure out what template file to use based on the second [module] declaration.
As an alternate way of declaring what template file to use you can use this:
/app/design/frontend/<interface>/<theme>/layout/<module>.xml
<?xml version="1.0"?>
<layout version="0.1.0">
    <[module]_index_index>
        <reference name="content">
            <block type="core/template" name="[module]" template="[module]/[module].phtml" />
        </reference>
    </[module]_index_index>
</layout>
/app/design/frontend/<interface>/<theme>/template/<module>/<module>.phtml
<h4><?php echo $this->__('Module List') ?></h4>
  
<?php  
        /*
        This will load one record from your database table.
        load(<module>_id) will load whatever ID number you give it.
        */
    /*
    $news = Mage::getModel('<module>/<module>')->load(1);
    echo $news->get<Module>Id();
    echo $news->getTitle();
    echo $news->getContent();
    echo $news->getStatus();
    */
  
        /*
        This block of code loads all of the records in the database table.
        It will iterate through the collection and the first thing it will do
        is set the Title to the current value of $i which is incremented each
        iteration and then echo that value back out.  At the very end it will
        save the entire collection.
        */
    /*
    $i = 0;
          
    $collection = Mage::getModel('<module>/<module>')->getCollection();
    $collection->setPageSize(5);
    $collection->setCurPage(2);
    $size = $collection->getSize();
    $cnt = count($collection);
    foreach ($collection as $item) {
        $i = $i+1;
        $item->setTitle($i);
        echo $item->getTitle();
    }
  
    $collection->walk('save');  
    */
  
        /*
        This shows how to load one value, change something and save it.
        */
  
    /*
    $object = Mage::getModel('<module>/<module>')->load(1);
    $object->setTitle('This is a changed title');
    $object->save();
    */
?>
NOTE: Uncomment anything that you would like to use and this is just a starting point and some common methods for you to try and pull the data out.
In this section I am utilizing the built-in Grid Widgets and form capabilities to create a form to allow editing and creating new items for your custom database.

Directory Additions

Here is the revised directory setup due to the additions and changes we need for the backend module.
/app/code/local/<Namespace>/<Module>/
Block/
    Adminhtml/
        <Module>/
            Edit/
                Tab/
controllers/
    Adminhtml/
etc/
Helper/
Model/
    Mysql4/
        <Module>/
sql/
    <module>_setup/
Blocks
These control the setup and appearance of your grids and the options that they display.
NOTE: Please note the fact that Block comes before Adminhtml in the class declaration. In any of the Magento modules in Adminhtml it is the opposite. For your module to work it has to be Block_Adminhtml otherwise you will get a ‘Cannot redeclare module…’ error.
/app/code/local/<Namespace>/<Module>/Block/Adminhtml/<Module>.php
<?php
  
class <Namespace>_<Module>_Block_Adminhtml_<Module> extends Mage_Adminhtml_Block_Widget_Grid_Container
{
    public function __construct()
    {
        $this->_controller = 'adminhtml_<module>';
        $this->_blockGroup = '<module>';
        $this->_headerText = Mage::helper('<module>')->__('Item Manager');
        $this->_addButtonLabel = Mage::helper('<module>')->__('Add Item');
        parent::__construct();
    }
}
/app/code/local/<Namespace>/<Module>/Block/Adminhtml/<Module>/Edit.php
<?php
  
class <Namespace>_<Module>_Block_Adminhtml_<Module>_Edit extends Mage_Adminhtml_Block_Widget_Form_Container
{
    public function __construct()
    {
        parent::__construct();
                
        $this->_objectId = 'id';
        $this->_blockGroup = '<module>';
        $this->_controller = 'adminhtml_<module>';
  
        $this->_updateButton('save', 'label', Mage::helper('<module>')->__('Save Item'));
        $this->_updateButton('delete', 'label', Mage::helper('<module>')->__('Delete Item'));
    }
  
    public function getHeaderText()
    {
        if( Mage::registry('<module>_data') && Mage::registry('<module>_data')->getId() ) {
            return Mage::helper('<module>')->__("Edit Item '%s'", $this->htmlEscape(Mage::registry('<module>_data')->getTitle()));
        } else {
            return Mage::helper('<module>')->__('Add Item');
        }
    }
}
/app/code/local/<Namespace>/<Module>/Block/Adminhtml/<Module>/Grid.php
<?php
  
class <Namespace>_<Module>_Block_Adminhtml_<Module>_Grid extends Mage_Adminhtml_Block_Widget_Grid
{
    public function __construct()
    {
        parent::__construct();
        $this->setId('<module>Grid');
        // This is the primary key of the database
        $this->setDefaultSort('<module>_id');
        $this->setDefaultDir('ASC');
        $this->setSaveParametersInSession(true);
        $this->setUseAjax(true);
    }
  
    protected function _prepareCollection()
    {
        $collection = Mage::getModel('<module>/<module>')->getCollection();
        $this->setCollection($collection);
        return parent::_prepareCollection();
    }
  
    protected function _prepareColumns()
    {
        $this->addColumn('<module>_id', array(
            'header'    => Mage::helper('<module>')->__('ID'),
            'align'     =>'right',
            'width'     => '50px',
            'index'     => '<module>_id',
        ));
  
        $this->addColumn('title', array(
            'header'    => Mage::helper('<module>')->__('Title'),
            'align'     =>'left',
            'index'     => 'title',
        ));
  
        /*
        $this->addColumn('content', array(
            'header'    => Mage::helper('<module>')->__('Item Content'),
            'width'     => '150px',
            'index'     => 'content',
        ));
        */
  
        $this->addColumn('created_time', array(
            'header'    => Mage::helper('<module>')->__('Creation Time'),
            'align'     => 'left',
            'width'     => '120px',
            'type'      => 'date',
            'default'   => '--',
            'index'     => 'created_time',
        ));
  
        $this->addColumn('update_time', array(
            'header'    => Mage::helper('<module>')->__('Update Time'),
            'align'     => 'left',
            'width'     => '120px',
            'type'      => 'date',
            'default'   => '--',
            'index'     => 'update_time',
        ));  
  
  
        $this->addColumn('status', array(
  
            'header'    => Mage::helper('<module>')->__('Status'),
            'align'     => 'left',
            'width'     => '80px',
            'index'     => 'status',
            'type'      => 'options',
            'options'   => array(
                1 => 'Active',
                0 => 'Inactive',
            ),
        ));
  
        return parent::_prepareColumns();
    }
  
    public function getRowUrl($row)
    {
        return $this->getUrl('*/*/edit', array('id' => $row->getId()));
    }
  
    public function getGridUrl()
    {
      return $this->getUrl('*/*/grid', array('_current'=>true));
    }
  
  
}
/app/code/local/<Namespace>/<Module>/Block/Adminhtml/<Module>/Edit/Form.php
<?php
  
class <Namespace>_<Module>_Block_Adminhtml_<Module>_Edit_Form extends Mage_Adminhtml_Block_Widget_Form
{
    protected function _prepareForm()
    {
        $form = new Varien_Data_Form(array(
                                        'id' => 'edit_form',
                                        'action' => $this->getUrl('*/*/save', array('id' => $this->getRequest()->getParam('id'))),
                                        'method' => 'post',
                                     )
        );
  
        $form->setUseContainer(true);
        $this->setForm($form);
        return parent::_prepareForm();
    }
}
/app/code/local/<Namespace>/<Module>/Block/Adminhtml/<Module>/Edit/Tabs.php
<?php
  
class <Namespace>_<Module>_Block_Adminhtml_<Module>_Edit_Tabs extends Mage_Adminhtml_Block_Widget_Tabs
{
  
    public function __construct()
    {
        parent::__construct();
        $this->setId('<module>_tabs');
        $this->setDestElementId('edit_form');
        $this->setTitle(Mage::helper('<module>')->__('News Information'));
    }
  
    protected function _beforeToHtml()
    {
        $this->addTab('form_section', array(
            'label'     => Mage::helper('<module>')->__('Item Information'),
            'title'     => Mage::helper('<module>')->__('Item Information'),
            'content'   => $this->getLayout()->createBlock('<module>/adminhtml_<module>_edit_tab_form')->toHtml(),
        ));
        
        return parent::_beforeToHtml();
    }
}
/app/code/local/<Namespace>/<Module>/Block/Adminhtml/<Module>/Edit/Tab/Form.php
<?php
  
class <Namespace>_<Module>_Block_Adminhtml_<Module>_Edit_Tab_Form extends Mage_Adminhtml_Block_Widget_Form
{
    protected function _prepareForm()
    {
        $form = new Varien_Data_Form();
        $this->setForm($form);
        $fieldset = $form->addFieldset('<module>_form', array('legend'=>Mage::helper('<module>')->__('Item information')));
        
        $fieldset->addField('title', 'text', array(
            'label'     => Mage::helper('<module>')->__('Title'),
            'class'     => 'required-entry',
            'required'  => true,
            'name'      => 'title',
        ));
  
        $fieldset->addField('status', 'select', array(
            'label'     => Mage::helper('<module>')->__('Status'),
            'name'      => 'status',
            'values'    => array(
                array(
                    'value'     => 1,
                    'label'     => Mage::helper('<module>')->__('Active'),
                ),
  
                array(
                    'value'     => 0,
                    'label'     => Mage::helper('<module>')->__('Inactive'),
                ),
            ),
        ));
        
        $fieldset->addField('content', 'editor', array(
            'name'      => 'content',
            'label'     => Mage::helper('<module>')->__('Content'),
            'title'     => Mage::helper('<module>')->__('Content'),
            'style'     => 'width:98%; height:400px;',
            'wysiwyg'   => false,
            'required'  => true,
        ));
        
        if ( Mage::getSingleton('adminhtml/session')->get<Module>Data() )
        {
            $form->setValues(Mage::getSingleton('adminhtml/session')->get<Module>Data());
            Mage::getSingleton('adminhtml/session')->set<Module>Data(null);
        } elseif ( Mage::registry('<module>_data') ) {
            $form->setValues(Mage::registry('<module>_data')->getData());
        }
        return parent::_prepareForm();
    }
}

Controller

/app/code/local/<Namespace>/<Module>/controllers/Adminhtml/<Module>Controller.php
NOTE: you need to manually add line 16, which is currently missing in this file. As per suggestion from mkd at page http://www.magentocommerce.com/boards/viewthread/11228/
<?php
  
class <Namespace>_<Module>_Adminhtml_<Module>Controller extends Mage_Adminhtml_Controller_Action
{
  
    protected function _initAction()
    {
        $this->loadLayout()
            ->_setActiveMenu('<module>/items')
            ->_addBreadcrumb(Mage::helper('adminhtml')->__('Items Manager'), Mage::helper('adminhtml')->__('Item Manager'));
        return $this;
    }  
    
    public function indexAction() {
        $this->_initAction();      
        $this->_addContent($this->getLayout()->createBlock('<module>/adminhtml_<module>'));
        $this->renderLayout();
    }
  
    public function editAction()
    {
        $<module>Id     = $this->getRequest()->getParam('id');
        $<module>Model  = Mage::getModel('<module>/<module>')->load($<module>Id);
  
        if ($<module>Model->getId() || $<module>Id == 0) {
  
            Mage::register('<module>_data', $<module>Model);
  
            $this->loadLayout();
            $this->_setActiveMenu('<module>/items');
            
            $this->_addBreadcrumb(Mage::helper('adminhtml')->__('Item Manager'), Mage::helper('adminhtml')->__('Item Manager'));
            $this->_addBreadcrumb(Mage::helper('adminhtml')->__('Item News'), Mage::helper('adminhtml')->__('Item News'));
            
            $this->getLayout()->getBlock('head')->setCanLoadExtJs(true);
            
            $this->_addContent($this->getLayout()->createBlock('<module>/adminhtml_<module>_edit'))
                 ->_addLeft($this->getLayout()->createBlock('<module>/adminhtml_<module>_edit_tabs'));
                
            $this->renderLayout();
        } else {
            Mage::getSingleton('adminhtml/session')->addError(Mage::helper('<module>')->__('Item does not exist'));
            $this->_redirect('*/*/');
        }
    }
    
    public function newAction()
    {
        $this->_forward('edit');
    }
    
    public function saveAction()
    {
        if ( $this->getRequest()->getPost() ) {
            try {
                $postData = $this->getRequest()->getPost();
                $<module>Model = Mage::getModel('<module>/<module>');
                
                $<module>Model->setId($this->getRequest()->getParam('id'))
                    ->setTitle($postData['title'])
                    ->setContent($postData['content'])
                    ->setStatus($postData['status'])
                    ->save();
                
                Mage::getSingleton('adminhtml/session')->addSuccess(Mage::helper('adminhtml')->__('Item was successfully saved'));
                Mage::getSingleton('adminhtml/session')->set<Module>Data(false);
  
                $this->_redirect('*/*/');
                return;
            } catch (Exception $e) {
                Mage::getSingleton('adminhtml/session')->addError($e->getMessage());
                Mage::getSingleton('adminhtml/session')->set<Module>Data($this->getRequest()->getPost());
                $this->_redirect('*/*/edit', array('id' => $this->getRequest()->getParam('id')));
                return;
            }
        }
        $this->_redirect('*/*/');
    }
    
    public function deleteAction()
    {
        if( $this->getRequest()->getParam('id') > 0 ) {
            try {
                $<module>Model = Mage::getModel('<module>/<module>');
                
                $<module>Model->setId($this->getRequest()->getParam('id'))
                    ->delete();
                    
                Mage::getSingleton('adminhtml/session')->addSuccess(Mage::helper('adminhtml')->__('Item was successfully deleted'));
                $this->_redirect('*/*/');
            } catch (Exception $e) {
                Mage::getSingleton('adminhtml/session')->addError($e->getMessage());
                $this->_redirect('*/*/edit', array('id' => $this->getRequest()->getParam('id')));
            }
        }
        $this->_redirect('*/*/');
    }
    /**
     * Product grid for AJAX request.
     * Sort and filter result for example.
     */
    public function gridAction()
    {
        $this->loadLayout();
        $this->getResponse()->setBody(
               $this->getLayout()->createBlock('<module>/adminhtml_<module>_grid')->toHtml()
        );
    }
}

XML Configuration Changes

/app/code/local/<Namespace>/<Module>/etc/config.xml
<?xml version="1.0"?>
<config>
    <modules>
        <[Namespace]_[Module]>
            <version>0.1.0</version>
        </[Namespace]_[Module]>
    </modules>
    <frontend>
        <routers>
            <[module]>
                <use>standard</use>
                <args>
                    <module>[Namespace]_[Module]</module>
                    <frontName>[module]</frontName>
                </args>
            </[module]>
        </routers>
        <layout>
            <updates>
                <[module]>
                    <file>[module].xml</file>
                </[module]>
            </updates>
        </layout>
    </frontend>
    <admin>
        <routers>
            <[module]>
                <use>admin</use>
                <args>
                    <module>[Namespace]_[Module]</module>
                    <frontName>[module]</frontName>
                </args>
            </[module]>
        </routers>
    </admin>
    <adminhtml>
        <menu>
            <[module] module="[module]">
                <title>[Module]</title>
                <sort_order>71</sort_order>              
                <children>
                    <items module="[module]">
                        <title>Manage Items</title>
                        <sort_order>0</sort_order>
                        <action>[module]/adminhtml_[module]</action>
                    </items>
                </children>
            </[module]>
        </menu>
        <acl>
            <resources>
                <all>
                    <title>Allow Everything</title>
                </all>
                <admin>
                    <children>
                        <[module]>
                            <title>[Module] Module</title>
                            <sort_order>200</sort_order>
                        </[module]>
                    </children>
                </admin>
            </resources>  
        </acl>
        <layout>
            <updates>
                <[module]>
                    <file>[module].xml</file>
                </[module]>
            </updates>
        </layout>
    </adminhtml>  
    <global>
        <models>
            <[module]>
                <class>[Namespace]_[Module]_Model</class>
                <resourceModel>[module]_mysql4</resourceModel>
            </[module]>
            <[module]_mysql4>
                <class>[Namespace]_[Module]_Model_Mysql4</class>
                <entities>
                    <[module]>
                        <table>[module]</table>
                    </[module]>
                </entities>
            </[module]_mysql4>
        </models>
        <resources>
            <[module]_setup>
                <setup>
                    <module>[Namespace]_[Module]</module>
                </setup>
                <connection>
                    <use>core_setup</use>
                </connection>
            </[module]_setup>
            <[module]_write>
                <connection>
                    <use>core_write</use>
                </connection>
  
  
            </[module]_write>
            <[module]_read>
                <connection>
                    <use>core_read</use>
                </connection>
            </[module]_read>
        </resources>
        <blocks>
            <[module]>
                <class>[Namespace]_[Module]_Block</class>
            </[module]>
        </blocks>
        <helpers>
            <[module]>
                <class>[Namespace]_[Module]_Helper</class>
            </[module]>
        </helpers>
    </global>
</config>
XML Layout
/app/design/adminhtml/<interface>/<theme>/layout/<module>.xml
<?xml version="1.0"?>
<layout version="0.1.0">
    <[module]_adminhtml_[module]_index>
        <reference name="content">
            <block type="[module]/adminhtml_[module]" name="[module]" />
        </reference>
    </[module]_adminhtml_[module]_index>
</layout>

Seperate Adminhtml Configuration

It’s also worth noting the adminhtml changes in the config.xml (above) can be placed in their own XML file instead, keeping these changes separated away:
/app/code/local/<Namespace>/<Module>/etc/adminhtml.xml
<?xml version="1.0"?>
<config>
    <menu>
        <[module] module="[module]">
            <title>[Module]</title>
            <sort_order>71</sort_order>              
            <children>
                <items module="[module]">
                    <title>Manage Items</title>
                    <sort_order>0</sort_order>
                    <action>[module]/adminhtml_[module]</action>
                </items>
            </children>
        </[module]>
    </menu>
    <acl>
        <resources>
            <all>
                <title>Allow Everything</title>
            </all>
            <admin>
                <children>
                    <[module]>
                        <title>[Module] Module</title>
                        <sort_order>200</sort_order>
                    </[module]>
                </children>
            </admin>
        </resources>  
    </acl>
    <layout>
        <updates>
            <[module]>
                <file>[module].xml</file>
            </[module]>
        </updates>
    </layout>
</config>

Standard Magento Admin URLs, no rewrite needed

Also, rather than using a rewrite for the admin section described above, you can implement the same standard admin generated urls Magento uses. These look like: ‘/admin/[module]/index/’ instead of the above that would generate ‘/[module]/adminhtml_[module]/index/’.
To implement this different url structure you can change the following in your config.xml:
/app/code/local/<Namespace>/<Module>/etc/config.xml
...
<admin>
    <routers>
        <!-- Includes our controller, so when we add the adminhtml menu item below, it is found! -->
        <adminhtml>
             <args>
                 <modules>
                     <[module] before="Mage_Adminhtml">[Namespace]_[Module]_Adminhtml</[module]>
                 </modules>
             </args>
         </adminhtml>
    </routers>
</admin>
<adminhtml>
    <menu>
        <[module] module="[module]">
            <title>[Module]</title>
            <sort_order>71</sort_order>              
            <children>
                <items module="[module]">
                    <title>Manage Items</title>
                    <sort_order>0</sort_order>
                    <action>adminhtml/[module]</action>
                </items>
            </children>
        </[module]>
    </menu>
..

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