hr module :new field added on user (parent user=>many2many) now you can put domain like : [('user_id', 'child_of', [uid])] if you want to open Departemnt tasks for current user and its child for example

bzr revid: mra@tinyerp.com-20090318104038-4kt32jemqov5dgdv

addons/hr/hr_department.py

@@ -1,7 +1,7 @@
 # -*- encoding: utf-8 -*-
 ##############################################################################
 #
-#    OpenERP, Open Source Management Solution	
+#    OpenERP, Open Source Management Solution
 #    Copyright (C) 2004-2009 Tiny SPRL (<http://tiny.be>). All Rights Reserved
 #    $Id$
 #
@@ -50,6 +50,7 @@ class hr_department(osv.osv):
                 return False
             level -= 1
         return True
+
     _constraints = [
         (_check_recursion, 'Error! You can not create recursive departments.', ['parent_id'])
     ]
@@ -81,7 +82,50 @@ class ir_action_window(osv.osv):
 
 ir_action_window()
 
+class res_users(osv.osv):
+    _inherit = 'res.users'
+    _description = 'res.users'
 
+    def _parent_compute(self, cr, uid, ids, name, arg, context={}):
+        result = {}
+        obj_dept = self.pool.get('hr.department')
+        for id in ids:
+            ids_dept = obj_dept.search(cr, uid, [('member_ids', 'in', [id])])
+            parent_ids = []
+            if ids_dept:
+                data_dept = obj_dept.read(cr, uid, ids_dept, ['manager_id'])
+                parent_ids = map(lambda x: x['manager_id'][0], data_dept)
+            result[id] = parent_ids
+        return result
 
-# vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:
+    def _child_compute(self, cr, uid, ids):
+        obj_dept = self.pool.get('hr.department')
+        child_ids = []
+        for id in ids:
+            ids_dept = obj_dept.search(cr, uid, [('manager_id', '=', id)])
+            if ids_dept:
+                data_dept = obj_dept.read(cr, uid, ids_dept, ['member_ids'])
+                childs = map(lambda x: x['member_ids'], data_dept)
+                childs = tools.flatten(childs)
+                if id in childs:
+                    childs.remove(id)
+                child_ids.extend(tools.flatten(childs))
+        return child_ids
 
+    def _parent_search(self, cr, uid, obj, name, args):
+        parent = []
+        for arg in args:
+            if arg[0] == 'parent_id':
+                parent = arg[2]
+        child_ids = self._child_compute(cr, uid, parent)
+        if not child_ids:
+            return [('id', 'in', [0])]
+        return [('id', 'in', child_ids)]
+
+    _columns = {
+        'parent_id': fields.function(_parent_compute, relation='res.users',fnct_search=_parent_search, method=True, string="Parent Users", type='many2many'),
+               }
+
+res_users()
+
+# vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:

addons/hr/hr_department_view.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <openerp>
     <data>
-        
+
         <!--
 	======================
 	department
@@ -48,14 +48,29 @@
             <field name="domain">[('parent_id','=',False)]</field>
         </record>
         <menuitem action="open_module_tree_department_tree" id="menu_department_tree" parent="base.menu_users"/>
-        
+
         <record id="open_module_tree_department" model="ir.actions.act_window">
             <field name="name">Departments</field>
             <field name="res_model">hr.department</field>
             <field name="view_type">form</field>
         </record>
-        
+
         <menuitem action="open_module_tree_department" id="menu_department_def" parent="hr.menu_department_tree"/>
-        
+
+        <!-- res.users inherit -->
+        <record model="ir.ui.view" id="view_users_form_inherit">
+			<field name="name">res.users.form</field>
+			<field name="type">form</field>
+			<field name="model">res.users</field>
+			<field name="inherit_id" ref="base.view_users_form"/>
+			<field name="arch" type="xml">
+				<notebook position="inside">
+					<page string="Parents">
+						<field name="parent_id" nolabel="1"/>
+					</page>
+				</notebook>
+			</field>
+		</record>
+
     </data>
 </openerp>