Kohana 3.2 ORM and PDO

Question

I am giving Kohana a try and I was trying to use the ORM + PDO + MySQL database, and I don't seem to find an answer in google or SO.

I have both the database and ORM modules enabled, and I have set PDO as default in modules/database/config/database.php

I have a simple controller, and a simple model:

MODEL application/classes/model/blogpost.php:

<?php
class Model_Blogpost extends ORM {
    protected $_table_name  = 'blog_post'; 
}

CONTROLLER: in application/classes/controller/welcome.php

<?php defined('SYSPATH') or die('No direct script access.');

class Controller_Welcome extends Controller {

  public function action_index() {

    $Blog_Post = ORM::factory('blogpost');    // ==> ERROR HERE

    $Blog_Post->name = 'test1';
    $Blog_Post->description = 'this is a quick test';
    $Blog_Post->content = 'The content goes here....';
    $Blog_Post->save();

    $id = $Blog_Post->id;

    $Blog_Post = ORM::factory('blogpost', $id);
    $view->Blog_Post = $Blog_Post;

    $this->response->body($view);
  }
} // End Welcome

I get the following error when I try to run the test:

Kohana_Exception [ 0 ]: Database method list_columns is not supported by Kohana_Database_PDO

I have done a search in google and Stack Overflow, and my impression is that ORM may not work with PDO, is this correct? or am I missing something?

Thank you.

Answer 1

list_columns is used for ORM to get all the columns in a table when they are not specified. To get around this, you can specify the table columns in the _table_columns protected property:

class Model_Blogpost extends ORM {
  protected $_table_name  = 'blog_post';
  protected $_table_columns = array(
    'column1' => NULL,
    'column2' => NULL,
    // ...
    'columnx' => NULL,
  ); 
}

This will ensure that list_columns is not called. The downside is that you will have to keep track of every change to the table you make. The upside is that an extra SHOW FULL COLUMNS query is not called, meaning a small performance boost.

Another way is to override the list_columns method and provide your own means of listing columns with it.

Answer 2

here. Sometimes Kohana's docs can be confusing - never fear! the source code, while it might sound scary, is FULL with comments and actually serves as a really good docs.