Get qty with childs and stock_date depends is product field or forecast

#036128

product.py

@@ -1,6 +1,7 @@
 # This file is part product_qty module for Tryton.
 # The COPYRIGHT file at the top level of this repository contains
 # the full copyright notices and license terms.
+import datetime
 from trytond.pool import Pool, PoolMeta
 from trytond.transaction import Transaction
 
@@ -32,7 +33,7 @@ class Product(metaclass=PoolMeta):
         Location = pool.get('stock.location')
         Date = pool.get('ir.date')
 
-        today = Date.today()
+        stock_date = Date.today() if name == 'product' else datetime.date.max
         context = Transaction().context
 
         # not locations in context
@@ -40,7 +41,7 @@ class Product(metaclass=PoolMeta):
             warehouses = Location.search([('type', '=', 'warehouse')])
             location_ids = [w.storage_location.id for w in warehouses]
             with Transaction().set_context(locations=location_ids,
-                    stock_date_end=today, with_childs=True):
+                    stock_date_end=stock_date, with_childs=True):
                 products_ids = list(map(int, products))
                 return cls._get_quantity(products, name, location_ids,
                     grouping_filter=(products_ids,))