1.4 User Guide

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The purpose of an extension is to become a standard interface which you can use, to share common function that utilize either CI Library or your own library, across your Gas models/instances.

We use Interface instead Class, in extension implementation, because :

Here you can found some default extension which bundled within Gas ORM.

Dummy Extension

I include this dummy extension within the repo as well. Lets look how it works :

class Gas_extension_dummy implements Gas_extension {

        // This is a properties, which will be used to transport Gas Instance
        public $gas;

        public $explanation;

         * __init
         * Initialize extension
         * @access public
         * @param  object
         * @return void
        public function __init($gas)
                // Here, Gas will transport your instance
                $this->gas = $gas;

         * explain
         * Explain about related Gas instance
         * @access public
         * @param  mixed
         * @return string
        public function explain($args = null)
                $CI =& get_instance();

                if ( ! class_exists('CI_Typography')) $CI->load->library('typography');

                if ( ! class_exists('CI_Table')) $CI->load->library('table');

                $arguments = ! is_null($this->explanation) ? var_export($this->explanation, TRUE) : var_export($args, TRUE);

                $nickname = key($this->gas->extensions);

                $fullname = $this->gas->extensions[$nickname];

                $path = __FILE__;

                $model = ucfirst($this->gas->model());

                $structure = $this->gas->list_fields();

                $relationships = array_keys($this->gas->relations);

                $records = $this->gas->get_raw_record();


                foreach ($records as $record)



                $table = $CI->table->generate();


                $explanation = 'Hello, i am an extension. ';

                $explanation .= 'My nickname is '.$nickname.' and my fullname is '.$fullname.'.'."\n";

                $explanation .= 'You can found me at '.$path.'.'."\n";

                $explanation .= 'You call me through '.$model.' instance, and passing bellow arguments : '."\n";

                $explanation .= $arguments ."\n";

                $explanation .= 'to processed, and to explain what '.$model.' model looks like.'."\n";

                $explanation .= $model.' model have table structure : ';

                $explanation .= implode(', ', $structure)."\n";

                $explanation .= $model.' model have defined relationship : ';

                $explanation .= implode(', ', $relationships)."\n";

                $explanation .= $model.' instance now is holding : '.count($records).' record(s)'."\n";

                $explanation .= 'With little help from Table and Typography library,'."\n";

                $explanation .= 'I can create this paragraph, also output the record into this table : '."\n";

                $explanation .= $table;

                $explanation .= 'So basicly, my purpose is to become a standard interface which you can use,'."\n";

                $explanation .= 'to share common function which utilize either CI Library or your own library, '."\n";

                $explanation .= 'across your Gas models/instances.'."\n";

                $explanation .= 'This is all I can say.'."\n";

                $formatted_explanation = $CI->typography->auto_typography($explanation);

                return '<pre>'.$formatted_explanation.'</pre>';

If you put dummy on your extension list, and enable the extension autoload option, then from any of your Gas model, you can directly use it.

$user = new User;

echo $user->dummy->all()->explain();

This should be a simple way, to describe how extension works in Gas ORM.

HTML Extension

If you did not autoload html extension, load it first


You can see the demo for table on my sandbox [3] . Generate HTML table from Gas model records

// execute some Gas finder
$users = Gas::factory('user')->html->all();

// simple usage
echo $users->table();

// hide some collumn
$hidden = array('username', 'email');

echo $users->hide($hidden)->table();

// set table heading
$headings = array('collumn id', 'collumn name', 'collumn username', 'collumn email');

echo $users->heading($headings)->table();

// set table template
$template = array( 'table_open' => '<table border="1" cellpadding="4" cellspacing="0">');

echo $users->template($template)->table();

// hide some collumn, set table heading, set template
$hidden = array('email');

$headings = array('collumn id', 'collumn name', 'collumn username');

$template = array( 'table_open' => '<table border="1" cellpadding="4" cellspacing="0">');

echo $users->hide($hidden)->heading($headings)->template($template)->table();

Generate HTML form from Gas model records

// execute some Gas finder
$user = Gas::factory('user')->html->find(1);

// simple usage
echo $user->form('controller/function');

// define entity type
$entities = array();

$entities['email'] = array('hidden' => array('id' => 'email'));

echo $user->definition($entities)->form('controller/function');

There are option for setting submit, separator, entity and hide as well. You can see the demo on my sandbox [4]

jQuery Extension

If you did not autoload jquery extension, load it first


This extension will be a good place to sharing common handler for any similar jQuery data processor plugin (eg : flot [2] for outputing graph or chart).

For now, it provide a method to handle and generate response for datatable. [1]

Assume you have download and put it into your application directory, and set it properly, point it to some controller as ajax source, then within your controller (which receive the ajax request), you only need to put

if ($_POST)
        echo Gas::factory('user')->jquery->datatable($_POST);
        echo Gas::factory('user')->jquery->datatable($_GET);

That will serve datatable for browsing user table. You can see the demo on my sandbox [5] .

Write your own Gas ORM extension

From above extension example, if you are ready to create your own, here litlle note you should remember :

  • Your extension, should prefixed with Gas_extension_ , then you can adding your extension name after it.
  • Your extension, should implements Gas_extension interface.
  • Your extension, should have __init($gas) method (notice the double underscore, distungished it from your model init method).
  • Your extension, should be under application/libraries.

Thats all about extension.