groupMemberModel->getGroups($user_id); } public function getGroupMembers($group_id) { return $this->groupMemberModel->getMembers($group_id); } public function addGroupMember($group_id, $user_id) { return $this->groupMemberModel->addUser($group_id, $user_id); } public function removeGroupMember($group_id, $user_id) { return $this->groupMemberModel->removeUser($group_id, $user_id); } public function isGroupMember($group_id, $user_id) { return $this->groupMemberModel->isMember($group_id, $user_id); } }