sub-contracting rewrite with testcases

accounts/doctype/purchase_invoice/purchase_invoice.py

@@ -320,6 +320,7 @@ class DocType(BuyingController):
 		 	self.doc.posting_date,'Posting Date')
 		
 		self.validate_write_off_account()
+		self.update_raw_material_cost()
 
 	def check_prev_docstatus(self):
 		for d in getlist(self.doclist,'entries'):
@@ -494,3 +495,16 @@ class DocType(BuyingController):
 	def on_update(self):
 		pass
 
+	def update_raw_material_cost(self):
+		if self.sub_contracted_items:
+			for d in self.doclist.get({"parentfield": "entries"}):
+				rm_cost = webnotes.conn.sql(""" select raw_material_cost / quantity 
+					from `tabBOM` where item = %s and is_default = 1 and docstatus = 1 
+					and is_active = 1 """, (d.item_code,))
+				rm_cost = rm_cost and flt(rm_cost[0][0]) or 0
+			
+				d.conversion_factor = d.conversion_factor or webnotes.conn.get_value(
+					"UOM Conversion Detail", {"parent": d.item_code, "uom": d.uom}, 
+					"conversion_factor") or 1
+			
+				d.rm_supp_cost = rm_cost * flt(d.qty) * flt(d.conversion_factor)

accounts/doctype/purchase_invoice_item/purchase_invoice_item.txt

@@ -1,8 +1,8 @@
 [
  {
-  "creation": "2013-01-29 20:53:00", 
+  "creation": "2013-02-11 10:54:51", 
   "docstatus": 0, 
-  "modified": "2013-02-08 14:06:17", 
+  "modified": "2013-02-27 18:10:04", 
   "modified_by": "Administrator", 
   "owner": "Administrator"
  }, 
@@ -282,6 +282,35 @@
   "search_index": 0, 
   "width": "150px"
  }, 
+ {
+  "doctype": "DocField", 
+  "fieldname": "valuation_rate", 
+  "fieldtype": "Currency", 
+  "hidden": 1, 
+  "label": "Valuation Rate", 
+  "no_copy": 1, 
+  "options": "Company:company:default_currency", 
+  "print_hide": 1, 
+  "read_only": 1
+ }, 
+ {
+  "doctype": "DocField", 
+  "fieldname": "conversion_factor", 
+  "fieldtype": "Float", 
+  "label": "Conversion Factor", 
+  "print_hide": 1
+ }, 
+ {
+  "doctype": "DocField", 
+  "fieldname": "rm_supp_cost", 
+  "fieldtype": "Currency", 
+  "hidden": 1, 
+  "label": "Raw Materials Supplied Cost", 
+  "no_copy": 1, 
+  "options": "Company:company:default_currency", 
+  "print_hide": 1, 
+  "read_only": 1
+ }, 
  {
   "allow_on_submit": 1, 
   "doctype": "DocField",