Doctrine_manual-1-2-en

Chapter 7: Defining Models 82
Now if we access for example the friends of Stefan Beer it would return one user 'Mikko
Koskenkorva':
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// test.php
// ...
$beer->free();
unset($beer);
$user = Doctrine_Core::getTable('User')->findOneByUsername('Stefan Beer');
print_r($user->Friends->toArray());
Now when you execute test.php you will see the following:
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$ php test.php
Array
(
[0] => Array
(
[id] => 4
[is_active] => 1
[is_super_admin] => 0
[first_name] =>
[last_name] =>
[username] => Mikko Koskenkorva
[password] =>
[type] =>
[created_at] => 2009-01-20 16:53:13
[updated_at] => 2009-01-20 16:53:13
)
)
Foreign Key Constraints
Introduction
A foreign key constraint specifies that the values in a column (or a group of columns) must
match the values appearing in some row of another table. In other words foreign key
constraints maintain the referential integrity between two related tables.
Say you have the product table with the following definition:
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// models/Product.php
class Product extends Doctrine_Record
{
public function setTableDefinition()
{
$this->hasColumn('name', 'string');
$this->hasColumn('price', 'decimal', 18);
$this->hasColumn('discounted_price', 'decimal', 18);
}
public function setUp()
{
$this->hasMany('Order as Orders', array(
'local' => 'id',
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