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Codeigniter Abstract Base Model

Is it possible to implement an abstract base model in Codeigniter? I created an abstract class that has the basic functions of CRUD, but I get the error "Could not instantiate an abstract class."

The abstract model is in / application / core / my _model.php and just

abstract class MY_Model extends CI_Model {

Unable to instantiate abstract class "located on line 174 / system / core / Common.php

It appears that Codeigniter is trying to create an instance of my_model.php when it loads, which I assume is due to the files in the / core folder being used as a place to expand the main system files, such as Controller and Model. Is there any way to stop this? I tried to autoload the model using Phil Sturgeon autoload , but that didn't help.

 /* | ------------------------------------------------------------------- | Native Auto-load | ------------------------------------------------------------------- | | Nothing to do with cnfig/autoload.php, this allows PHP autoload to work | for base controllers and some third-party libraries. | */ function __autoload($class) { if(strpos($class, 'CI_') !== 0) { @include_once( APPPATH . 'core/'. $class . EXT ); } }

I understand that a simple way to do this is to simply include the file at the beginning of each model in which I wanted to use it, but obviously this would be less optimal.

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Why do an essay MY_Model? You can use all your CRUD functions in MY_Model and extend your models from MY_Model instead of CI_Model. You do not need to use autoload, since CodeIgniter allows you to extend CI_Model with MY_Model as long as you put it in the main folder.

A good example of MY_Model is an example from Jamie Rumbelov. You will find it here: https://github.com/jamierumbelow/codeigniter-base-model/

Good luck

Greetings

Bart

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I am trying to configure the Loader class to accept tags and interfaces.

First I put all my changes in my / application / core / MY _Loader.php:

  <?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); /** * CodeIgniter * * An open source application development framework for PHP 5.1.6 or newer * * @package CodeIgniter * @author ExpressionEngine Dev Team * @copyright Copyright (c) 2008 - 2011, EllisLab, Inc. * @license http://codeigniter.com/user_guide/license.html * @link http://codeigniter.com * @since Version 1.0 * @filesource */ // ------------------------------------------------------------------------ // Joseff Betancourt - 11/14/2012 modified code by adding a autoloader and interface loader copied from model loader. /** * Loader Class * * Loads views and files * * @package CodeIgniter * @subpackage Libraries * @author ExpressionEngine Dev Team * @category Loader * @link http://codeigniter.com/user_guide/libraries/loader.html */ class MY_Loader extends CI_Loader { // All these are set automatically. Don't mess with them. /** * Nesting level of the output buffering mechanism * * @var int * @access protected */ protected $_ci_abstracts_paths = array(); /** * List of paths to load models from * * @var array * @access protected */ protected $_ci_interfaces_paths = array(); /** * List of paths to load helpers from * * @var array * @access protected */ protected $_ci_abstracts = array(); /** * List of loaded interfaces * * @var array * @access protected */ protected $_ci_interfaces = array(); /** * List of loaded helpers * * @var array * @access protected */ /** * Constructor * * Sets the path to the view files and gets the initial output buffering level */ function __construct() { parent::__construct(); $this->_ci_abstracts_paths = array(APPPATH); $this->_ci_interfaces_paths = array(APPPATH); log_message('debug', "Loader Class Initialized"); } // -------------------------------------------------------------------- /** * Initialize the Loader * * This method is called once in CI_Controller. * * @param array * @return object */ public function initialize() { $this->_ci_abstracts = array(); $this->_ci_interfaces = array(); $this->_ci_autoloader(); return $this; } // -------------------------------------------------------------------- /** * Abstracts Loader * * This function lets users load and instantiate models. * * 11/14/2012 - Joseff Betancourt - Cloned from Models * * @param string the name of the class * @param string name for the abstract * @param bool database connection * @return void */ public function abstracts($abstracts, $name = '', $db_conn = FALSE) { if (is_array($abstracts)) { foreach ($abstracts as $babe) { $this->abstracts($babe); } return; } if ($abstracts == '') { return; } $path = ''; // Is the abstracts in a sub-folder? If so, parse out the filename and path. if (($last_slash = strrpos($abstracts, '/')) !== FALSE) { // The path is in front of the last slash $path = substr($abstracts, 0, $last_slash + 1); // And the model name behind it $abstracts = substr($abstracts, $last_slash + 1); } if ($name == '') { $name = $abstracts; } if (in_array($name, $this->_ci_abstracts, TRUE)) { return; } $CI =& get_instance(); if (isset($CI->$name)) { show_error('The model name you are loading is the name of a resource that is already being used: '.$name); } $abstracts = strtolower($abstracts); foreach ($this->_ci_abstracts_paths as $mod_path) { if ( ! file_exists($mod_path.'abstracts/'.$path.$abstracts.'.php')) { continue; } if ($db_conn !== FALSE AND ! class_exists('CI_DB')) { if ($db_conn === TRUE) { $db_conn = ''; } $CI->load->database($db_conn, FALSE, TRUE); } if ( ! class_exists('CI_Abstracts')) { load_class('Abstracts', 'core'); } require_once($mod_path.'abstracts/'.$path.$abstracts.'.php'); $abstracts = ucfirst($abstracts); $CI->$name = new $abstracts(); $this->_ci_abstracts[] = $name; return; } // couldn't find the abstracts show_error('Unable to locate the abstracts you have specified: '.$abstracts); } // -------------------------------------------------------------------- /** * Interface Loader * * This function lets users load and instantiate interfaces. * * 11/14/2012 - Joseff Betancourt - Cloned from Models * * @param string the name of the class * @param string name for the interface * @param bool database connection * @return void */ public function interfaces($interfaces, $name = '', $db_conn = FALSE) { if (is_array($interfaces)) { foreach ($interfaces as $babe) { $this->interfaces($babe); } return; } if ($interfaces == '') { return; } $path = ''; // Is the abstracts in a sub-folder? If so, parse out the filename and path. if (($last_slash = strrpos($interfaces, '/')) !== FALSE) { // The path is in front of the last slash $path = substr($interfaces, 0, $last_slash + 1); // And the model name behind it $interfaces = substr($interfaces, $last_slash + 1); } if ($name == '') { $name = $interfaces; } if (in_array($name, $this->_ci_interfaces, TRUE)) { return; } $CI =& get_instance(); if (isset($CI->$name)) { show_error('The interface name you are loading is the name of a resource that is already being used: '.$name); } $interfaces = strtolower($interfaces); foreach ($this->_ci_interfaces_paths as $mod_path) { if ( ! file_exists($mod_path.'interfaces/'.$path.$interfaces.'.php')) { continue; } if ($db_conn !== FALSE AND ! class_exists('CI_DB')) { if ($db_conn === TRUE) { $db_conn = ''; } $CI->load->database($db_conn, FALSE, TRUE); } if ( ! class_exists('CI_Interfaces')) { load_class('Interfaces', 'core'); } require_once($mod_path.'interfaces/'.$path.$interfaces.'.php'); $interfaces = ucfirst($interfaces); $CI->$name = new $interfaces(); $this->_ci_interfaces[] = $name; return; } // couldn't find the interfaces show_error('Unable to locate the interfaces you have specified: '.$interfaces); } // -------------------------------------------------------------------- /** * Autoloader * * The config/autoload.php file contains an array that permits sub-systems, * libraries, and helpers to be loaded automatically. * * @param array * @return void */ private function _ci_autoloader() { // Abstracts models if (isset($autoload['abstracts'])) { $this->model($autoload['abstracts']); } // Interfaces models if (isset($autoload['interfaces'])) { $this->model($autoload['interfaces']); } } // -------------------------------------------------------------------- } /* End of file Loader.php */ /* Location: ./system/core/Loader.php */

Then I copy core Model.php to Abstracts.php and Interfaces.php (replace the word Model with or or) and put them in the application / core / folder.

In Autoload I added

 /* | ------------------------------------------------------------------- | Auto-load Interfaces | ------------------------------------------------------------------- | Prototype: | | $autoload['interfaces'] = array('interface1', 'interface2'); | */ $autoload['interfaces'] = array(); /* | ------------------------------------------------------------------- | Auto-load Abstracts | ------------------------------------------------------------------- | Prototype: | | $autoload['abstracts'] = array('abstract1', 'abstract2'); | */ $autoload['abstracts'] = array();

and finally, I added the directory to the application folder for abstracts and interfaces. Not fully proven, but I think this is a slightly more holistic approach, allowing a person to download an abstract when necessary for reference.

You should also create abstract text in the abstract folder as follows:

 abstract class MY_Model extends CI_Model { blah }
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Save file to / application / core / MY _model.php:

 <?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); class MY_model extends CI_Model { public function __construct() { parent::__construct(); } // Return all records in the table public function get_all($table) { $q = $this->db->get($table); if($q->num_rows() > 0) { return $q->result(); } return array(); } // Return only one row public function get_row($table,$primaryfield,$id) { $this->db->where($primaryfield,$id); $q = $this->db->get($table); if($q->num_rows() > 0) { return $q->row(); } return false; } // Return one only field value public function get_data($table,$primaryfield,$fieldname,$id) { $this->db->select($fieldname); $this->db->where($primaryfield,$id); $q = $this->db->get($table); if($q->num_rows() > 0) { return $q->result(); } return array(); } // Insert into table public function add($table,$data) { return $this->db->insert($table, $data); } // Update data to table public function update($table,$data,$primaryfield,$id) { $this->db->where($primaryfield, $id); $q = $this->db->update($table, $data); return $q; } // Delete record from table public function delete($table,$primaryfield,$id) { $this->db->where($primaryfield,$id); $this->db->delete($table); } // Check whether a value has duplicates in the database public function has_duplicate($value, $tabletocheck, $fieldtocheck) { $this->db->select($fieldtocheck); $this->db->where($fieldtocheck,$value); $result = $this->db->get($tabletocheck); if($result->num_rows() > 0) { return true; } else { return false; } } // Check whether the field has any reference from other table // Normally to check before delete a value that is a foreign key in another table public function has_child($value, $tabletocheck, $fieldtocheck) { $this->db->select($fieldtocheck); $this->db->where($fieldtocheck,$value); $result = $this->db->get($tabletocheck); if($result->num_rows() > 0) { return true; } else { return false; } } // Return an array to use as reference or dropdown selection public function get_ref($table,$key,$value,$dropdown=false) { $this->db->from($table); $this->db->order_by($value); $result = $this->db->get(); $array = array(); if ($dropdown) $array = array("" => "Please Select"); if($result->num_rows() > 0) { foreach($result->result_array() as $row) { $array[$row[$key]] = $row[$value]; } } return $array; } }

then expand in this way

 class any_model extends MY_Model { public function __construct() { parent::__construct(); } }
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