While the obvious and convinient way of deleting a link between User and Group would be the following, you still should *NOT* do this:
<code type="php">
$user = $conn->getTable('User')->find(5);
$user->GroupUser
->remove(0)
->remove(1);
$user->save();
</code>
This is due to a fact that $user->GroupUser loads all group links for given user. This can time-consuming task if user belongs to many groups. Even if the user belongs to few groups this will still execute an unnecessary SELECT statement.
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 trhough the Query API.
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.
<code type="php">
$user = $conn->getTable('User')->find(5);
$user->unlink('Group', array(0, 1));
$user->save();
</code>
While the obvious and convinient way of deleting a link between User and Group would be the following, you still should *NOT* do this:
<code type="php">
$user = $conn->getTable('User')->find(5);
$user->GroupUser
->remove(0)
->remove(1);
$user->save();
</code>
This is due to a fact that $user->GroupUser loads all group links for given user. This can time-consuming task if user belongs to many groups. Even if the user belongs to few groups this will still execute an unnecessary SELECT statement.
