What is the difference between attach()
and sync()
in Laravel 4's Eloquent ORM? I've tried to look around but couldn't find anything!
What is the difference between attach()
and sync()
in Laravel 4's Eloquent ORM? I've tried to look around but couldn't find anything!
attach():
Example:
$user = User::find(1);
$user->roles()->attach(1);
sync():
Similar to the attach()
method, the sync()
method is used to attach related models. However, the main differences are:
sync()
accepts an array of IDs to place on the pivot tableExample:
user_role
id user_id role_id 1 12 1 2 12 5 3 12 2
$user = User::find(12);
$user->roles()->sync(array(1, 2, 3));
The above operation will delete:
id user_id role_id 2 12 5
And insert role_id 3
to the table.
user_role table
id user_id role_id 1 12 1 3 12 2 4 12 3