Thank you, but I met new problem about nested data. schema:

definition user {
    relation manager: department
    permission view = manager->view
}

definition department {
    relation child: department | department#child
    relation member: user
    permission view = member + child->member
}

test relations:

department:1#child@department:2
department:1#child@department:3
department:2#child@department:4

department:1#member@user:1
department:2#member@user:2
department:3#member@user:3
department:4#member@user:4
user:dept_1_manager#manager@department:1