set department name with company abbr

erpnext/hr/doctype/department/department.json

@@ -3,7 +3,7 @@
  "allow_guest_to_view": 0, 
  "allow_import": 1, 
  "allow_rename": 1, 
- "autoname": "field:department_name", 
+ "autoname": "",
  "beta": 0, 
  "creation": "2013-02-05 11:48:26", 
  "custom": 0, 
@@ -434,7 +434,7 @@
  "issingle": 0, 
  "istable": 0, 
  "max_attachments": 0, 
- "modified": "2018-04-18 12:02:42.572599", 
+ "modified": "2018-05-11 12:18:18.839182",
  "modified_by": "Administrator", 
  "module": "HR", 
  "name": "Department", 

erpnext/hr/doctype/department/department.py

@@ -10,6 +10,10 @@ from frappe.model.document import Document
 class Department(NestedSet):
 	nsm_parent_field = 'parent_department'
 
+	def autoname(self):
+		abbr = frappe.db.get_value('Company', self.company, 'abbr')
+		self.name = '{0} - {1}'.format(self.department_name, abbr)
+
 	def update_nsm_model(self):
 		frappe.utils.nestedset.update_nsm(self)