/**
* Takes post data and prepares it for setting the membership on the group.
* Adds and removes users to group based on a form's userMembershipData
* @param $form
* @param $group
* @return boolean. True if membership was set successfully.
*/
public static function setMembershipFromForm($form, $group)
{
assert('$group instanceof Group');
assert('$form instanceof GroupUserMembershipForm');
$removedUsers = array();
$addedUsers = array();
foreach ($group->users as $index => $user) {
if (empty($form->userMembershipData[$user->id]) && !$user->isSystemUser && !$user->isRootUser) {
$removedUsers[] = $user;
}
}
foreach ($removedUsers as $user) {
$group->users->remove($user);
}
$users = GroupUserMembershipFormUtil::makeUsersFromUserMembershipData($form->userMembershipData);
foreach ($users as $user) {
if (!$group->users->contains($user)) {
$group->users->add($user);
$addedUsers[] = $user;
}
}
$group->save();
foreach ($removedUsers as $user) {
AllPermissionsOptimizationUtil::userRemovedFromGroup($group, $user);
}
foreach ($addedUsers as $user) {
AllPermissionsOptimizationUtil::userAddedToGroup($group, $user);
}
if (!empty($removedUsers)) {
ReadPermissionsSubscriptionUtil::userRemovedFromGroup();
}
if (!empty($addedUsers)) {
ReadPermissionsSubscriptionUtil::userAddedToGroup();
}
return true;
}