erpnext/stock/__init__.py

import frappe
from frappe import _

install_docs = [
	{"doctype":"Role", "role_name":"Stock Manager", "name":"Stock Manager"},
	{"doctype":"Role", "role_name":"Item Manager", "name":"Item Manager"},
	{"doctype":"Role", "role_name":"Stock User", "name":"Stock User"},
	{"doctype":"Role", "role_name":"Quality Manager", "name":"Quality Manager"},
	{"doctype":"Item Group", "item_group_name":"All Item Groups", "is_group": 1},
	{"doctype":"Item Group", "item_group_name":"Default",
		"parent_item_group":"All Item Groups", "is_group": 0},
]

def get_warehouse_account_map(company=None):
	company_warehouse_account_map = company and frappe.flags.setdefault('warehouse_account_map', {}).get(company)
	warehouse_account_map = frappe.flags.warehouse_account_map

	if not warehouse_account_map or not company_warehouse_account_map or frappe.flags.in_test:
		warehouse_account = frappe._dict()

		filters = {}
		if company:
			filters['company'] = company
			frappe.flags.setdefault('warehouse_account_map', {}).setdefault(company, {})

		for d in frappe.get_all('Warehouse',
			fields = ["name", "account", "parent_warehouse", "company", "is_group"],
			filters = filters,
			order_by="lft, rgt"):
			if not d.account:
				d.account = get_warehouse_account(d, warehouse_account)

			if d.account:
				d.account_currency = frappe.db.get_value('Account', d.account, 'account_currency', cache=True)
				warehouse_account.setdefault(d.name, d)
		if company:
			frappe.flags.warehouse_account_map[company] = warehouse_account
		else:
			frappe.flags.warehouse_account_map = warehouse_account

	return frappe.flags.warehouse_account_map.get(company) or frappe.flags.warehouse_account_map

def get_warehouse_account(warehouse, warehouse_account=None):
	account = warehouse.account
	if not account and warehouse.parent_warehouse:
		if warehouse_account:
			if warehouse_account.get(warehouse.parent_warehouse):
				account = warehouse_account.get(warehouse.parent_warehouse).account
			else:
				from frappe.utils.nestedset import rebuild_tree
				rebuild_tree("Warehouse", "parent_warehouse")
		else:
			account = frappe.db.sql("""
				select
					account from `tabWarehouse`
				where
					lft <= %s and rgt >= %s and company = %s
					and account is not null and ifnull(account, '') !=''
				order by lft desc limit 1""", (warehouse.lft, warehouse.rgt, warehouse.company), as_list=1)

			account = account[0][0] if account else None

	if not account and warehouse.company:
		account = get_company_default_inventory_account(warehouse.company)

	if not account and warehouse.company:
		account = frappe.db.get_value('Account',
			{'account_type': 'Stock', 'is_group': 0, 'company': warehouse.company}, 'name')

	if not account and warehouse.company and not warehouse.is_group:
		frappe.throw(_("Please set Account in Warehouse {0} or Default Inventory Account in Company {1}")
			.format(warehouse.name, warehouse.company))
	return account

def get_company_default_inventory_account(company):
	return frappe.get_cached_value('Company',  company, 'default_inventory_account')