commonified some purchase code, added test case for auto inventory accounting for purchase invoice

stock/doctype/purchase_receipt/purchase_receipt.py

@@ -89,16 +89,6 @@ class DocType(BuyingController):
 				webnotes.msgprint("Another Purchase Receipt using the same Challan No. already exists.\
 			Please enter a valid Challan No.", raise_exception=1)
 
-
-	# update valuation rate
-	def update_valuation_rate(self):
-		for d in self.doclist.get({"parentfield": "purchase_receipt_details"}):
-			if d.qty:
-				d.valuation_rate = (flt(d.purchase_rate) + flt(d.item_tax_amount)/flt(d.qty)
-					+ flt(d.rm_supp_cost) / flt(d.qty)) / flt(d.conversion_factor)
-			else:
-				d.valuation_rate = 0.0
-
 	#check in manage account if purchase order required or not.
 	# ====================================================================================
 	def po_required(self):
@@ -134,8 +124,7 @@ class DocType(BuyingController):
 		pc_obj.validate_reference_value(self)
 		self.check_for_stopped_status(pc_obj)
 
-		# update valuation rate
-		self.update_valuation_rate()
+		self.update_valuation_rate("purchase_receipt_details")
 
 
 	# On Update

stock/doctype/purchase_receipt/test_purchase_receipt.py

@@ -36,7 +36,6 @@ class TestPurchaseReceipt(unittest.TestCase):
 		
 	def test_purchase_receipt_gl_entry(self):
 		webnotes.defaults.set_global_default("auto_inventory_accounting", 1)
-		
 		self.assertEqual(cint(webnotes.defaults.get_global_default("auto_inventory_accounting")), 1)
 		
 		pr = webnotes.bean(copy=test_records[0])
@@ -47,7 +46,6 @@ class TestPurchaseReceipt(unittest.TestCase):
 		gl_entries = webnotes.conn.sql("""select account, debit, credit
 			from `tabGL Entry` where voucher_type='Purchase Receipt' and voucher_no=%s
 			order by account desc""", pr.doc.name, as_dict=1)
-			
 		self.assertTrue(gl_entries)
 		
 		stock_in_hand_account = webnotes.conn.get_value("Company", pr.doc.company,