Model Library for Codeigniter

I have made a model library for codeigniter. It is based on the article http://maestric.com/doc/php/codeigniter_models


if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class MY_Model extends Model {

var $table = "";

function My_Model()
{
parent::Model();
$this->load->database();
}

function find($type = 'all', $options = array())
{
if ($type == 'first')
{
$this->db->limit(1);
}
if(array_key_exists('fields', $options))
{
$this->db->select(implode(",", $options['fields']));
}
if(array_key_exists('where', $options))
{
foreach ($option['where'] as $key=>$value)
{
$this->db->where($key, $value);
}
}
if(array_key_exists('order', $options))
{
foreach ($option['where'] as $key=>$value)
{
$this->db->order_by($key, $value);
}
}
if(array_key_exists('limit', $options))
{
$limit = $options['limit'];
if(array_key_exists('limit', $limit) && !array_key_exists('offset', $limit))
{
$this->db->limit($limit['limit']);
}
if(array_key_exists('limit', $limit) && array_key_exists('offset', $limit))
{
$this->db->limit($limit['limit'], $limit['offset']);
}
}
$query = $this->db->get($this->table);
$result = $query->result_array();
return (count($result) > 0 ? $result[0] : NULL);
}

function find_first($options)
{
return $this->find('first', $options);
}

function find_all($options)
{
return $this->find('all', $options);
}

function find_id($id)
{
if ($id == NULL)
{
return NULL;
}
return $this->find('first', array('where'=>array('id'=>$id)));
}

function insert($data)
{
$this->db->insert($this->table, $data);
return $this->db->insert_id();
}

function update($id, $data)
{
$this->db->where('id', $id);
$this->db->update($this->table, $data);
}

function delete($id)
{
if ($id != NULL)
{
$this->db->where('id', $id);
$this->db->delete($this->table);
}
}
}
?>