how to instantiate a class with result object in Codeigniter? - codeigniter

Question

The documentation for result() says that we can pass the name of a class to instantiate for each result object: http://codeigniter.com/user_guide/database/results.html
I'm can't figure out correct way to do so.I need to pass few fields from the result object to the constructor.
$query = $this->db->query("SELECT * FROM users;");
foreach ($query->result('User') as $user)
{
echo $row->name; // call attributes
echo $row->reverse_name(); // or methods defined on the 'User' class
}
please let me know if there are better ways!

Answer 1

You can create a static Class method in your User class that creates a user or users instances. You will need to add the appropriate instance vars to the User class.
var $username = FALSE;
var $password = FALSE;
public static function get_user_by_id($id)
{
$CI =& get_instance();
$query = $CI->db->get_where('users', array('id' => $id));
$user = $query->row(0, 'User');
return $user;
}
In the example I'm getting a reference to the CodeIgniter instance to access the database. Since you can't access the database from a Class method since it is not an object instance.

Answer 2

You can't.
The object instantiated can't be passed any arguments, which means you need to create a method you can use to pass these fields to the object which is instantiated:
$query = $this->db->query("SELECT * FROM users;");
foreach ($query->result('User') as $user)
{
$row->init_my_fields('field1', 'field2'); //instead of passing the fields through the __construct()
echo $row->name; // call attributes
echo $row->reverse_name(); // or methods defined on the 'User' class
}

Answer 3

from codeigniter documentation
$query = $db->query("SELECT * FROM users LIMIT 1;");
$row = $query->getRow(0, 'User'); // or ->row(0, 'User') in CI 3
from codeigniter /system/database/DB_result.php
public function custom_result_object($class_name)
{
...
if ($_data !== NULL)
{
for ($i = 0; $i < $c; $i++)
{
$this->custom_result_object[$class_name][$i] = new $class_name();
foreach ($this->{$_data}[$i] as $key => $value)
{
$this->custom_result_object[$class_name][$i]->$key = $value;
}
}
return $this->custom_result_object[$class_name];
}
...
}
I believe this means that CI define new class with empty constructor from the wanted class "should be available to instantiate in the scope" , and tries to set its properties with the values from the row result and then returns it