Doctrine_manual-1-2-en

Chapter 8: Working with Models 108
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8-31
// test.php
// ...
$user = new User();
$user->username = 'Some User';
$user->Groups[0]->username = 'Some Group';
$user->Groups[1]->username = 'Some Other Group';
$user->save();
However in real world scenarios you often already have existing groups, where you want to
add a given user. The most efficient way of doing this is:
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8-32
// test.php
// ...
$groupUser = new GroupUser();
$groupUser->user_id = $userId;
$groupUser->group_id = $groupId;
$groupUser->save();
Deleting a Link
The right way to delete links between many-to-many associated records is by using the DQL
DELETE statement. Convenient and recommended way of using DQL DELETE is through the
Query API.
Listing
8-33
// test.php
// ...
$q = Doctrine_Query::create()
->delete('GroupUser')
->addWhere('user_id = ?', 5)
->whereIn('group_id', array(1, 2));
$deleted = $q->execute();
Another way to unlink the relationships between related objects is through the
Doctrine_Record::unlink method. However, you should avoid using this method unless
you already have the parent model, since it involves querying the database first.
Listing
8-34
// test.php
// ...
$user = Doctrine_Core::getTable('User')->find(5);
$user->unlink('Group', array(1, 2));
$user->save();
You can also unlink ALL relationships to Group by omitting the second argument:
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8-35
// test.php
// ...
$user->unlink('Group');
While the obvious and convenient way of deleting a link between User and Group would be
the following, you still should NOT do this:
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