When using the ACL implementation in Symfony2 in a web application, we have come across a use case where the suggested way of using the ACLs (checking a users permissions on a single domain object) becomes unfeasible. Thus, we wonder if there exists some part of the ACL API we can use to solve our problem. 

The use case is in a controller that prepares a list of domain objects to be presented in a template, so that the user can choose which of her objects she wants to edit. The user does not have permission to edit all of the objects in the database, so the list must be filtered accordingly.

This could (among other solutions) be done according to two strategies:

1) A query filter that appends a given query with the valid object ids from the present user's ACL for the object(or objects). I.e:

```
WHERE <other conditions> AND u.id IN(<list of legal object ids here>)

```

2) A post-query filter that removes the objects the user does not have the correct permissions for after the complete list has been retrieved from the database. I.e:

```
$objs   = <query for objects>
$objIds = <getting all the permitted obj ids from the ACL>
for ($obj in $objs) {
    if (in_array($obj.id, $objIds) { $result[] = $obj; } 
}
return $result;

```

The first strategy is preferable as the database is doing all the filtering work, and both require two database queries. One for the ACLs and one for the actual query, but that is probably unavoidable.

Is there any implementation of one of these strategies (or something achieving the desired results) in Symfony2?