Learning Kohana

class Auto_Modeler extends Model
{
	protected $data = array();
 
	public function __construct($id = NULL)
	{
		parent::__construct();
 
		if ($id != NULL)
		{
			// try and get a row with this ID
			$data = $this->db->getwhere($this->table_name, array('id' => $id))->result(FALSE);
 
			// try and assign the data
			if (count($data) == 1 AND $data = $data->current())
			{
				foreach ($data as $key => $value)
					$this->data[$key] = $value;
			}
		}
	}
 
	public function __destruct()
	{
		return TRUE;
	}
 
	public function __get($key)
	{
		if (isset($this->data[$key]))
			return $this->data[$key];
	}
 
	public function __set($key, $value)
	{
		if (empty($this->data[$key]) OR $this->data[$key] !== $value)
			$this->data[$key] = $value;
	}
 
	public static function factory($model = FALSE, $id = FALSE)
	{
		$model = empty($model) ? __CLASS__ : ucfirst($model).'_Model';
		return new $model($id);
	}
 
	public function set_fields($data)
	{
		foreach ($data as $key => $value)
			if (isset($this->data[$key]))
				$this->data[$key] = $value;
	}
 
	public function save()
	{
		if ($this->data['id']) // Do an update
			return count($this->db->update($this->table_name, $this->data, array('id' => $this->data['id'])));
		else // Do an insert
			return $this->db->insert($this->table_name, $this->data)->insert_id();
	}
 
	public function delete()
	{
		if ($this->data['id'])
		{
			$this->db->delete($this->table_name, array('id' => $this->data['id']));
			return $this->__destruct();
		}
	}
 
	public function fetch_all($orderby = 'id', $direction = 'ASC')
	{
		return $this->db->orderby($orderby, $direction)->get($this->table_name)->result(TRUE, __CLASS__);
	}
 
	public function select_list($key, $display)
	{
		$rows = array();
 
		foreach ($this->fetch_all() as $row)
			$rows[$row->$key] = $row->$display;
 
		return $rows;
	}
}

class Post_Model extends Auto_Modeler
{
	// Database table name
	protected $table_name = 'posts';
 
	// Database fields and default values
	protected $data = array('id' => '',
	                        'title' => '',
	                        'content' => '',
	                        'date' => '',
	                        'active' => '');
}

class Post_Controller extends Controller {
 
	public function index()
	{
		$post_model = new Post_Model();
		$this->template->title = 'Blog Posts';
 
		$this->template->content = new View('publication/index');
		$this->template->content->posts = $post_model->fetch_all();
	}
 
	public function add()
	{
		$this->template->title = 'Add Post';
 
		$form = new Forge(NULL, 'Add Post');
		$form->input('title')->rules('required');
		$form->input('content')->label(TRUE)->rules('required');
		$form->dateselect('date')->label(TRUE)->rules('required')->set_parts(array('month', 'day', 'year'));
		$form->checkbox('active')->label(TRUE)->value(TRUE);
		$form->submit('Add Post');
 
		if ($form->validate() AND $post = $form->as_array())
		{
			$this->upload($post);
			url::redirect('proof_sheet/index');
		}
		else
		{
			$this->template->content = $form;
		}
	}
 
	public function edit($id = NULL)
	{
		$this->template->title = 'Edit Blog Post '.$id;
 
		$post = new Post_Model($id);
		$form = new Forge(NULL, 'Edit Post');
		$form->hidden('id')->value($post->id);
		$form->input('title')->value($post->title)->rules('required');
		$form->input('content')->label(TRUE)->rules('required')->value($post->content);
		$form->dateselect('date')->label(TRUE)->rules('required')->set_parts(array('month', 'day', 'year'))->value($post->date);
		$form->checkbox('active')->label(TRUE)->value(TRUE)->checked($post->current);
		$form->submit('Update Post');
 
		if ($form->validate() AND $post_data = $form->as_array())
		{
			$this->do_post($post_data);
			url::redirect('post/index');
		}
		else
		{
			$this->template->content = $form;
		}
	}
 
	private function do_post($post)
	{
		// Insert/update the new item magically
		$post= new Post_Model();
		$post->set_fields($post);
		$post->save();
	}