Add round_price

We add a common method to round prices that are stored using the price digits.
It is useless to use the digits from the field because it can not be changed in
any other way than by configuration.

issue9146
review299521002

production.py

@@ -11,6 +11,8 @@ from trytond.model.exceptions import AccessError
 from trytond.pyson import Eval, Bool
 from trytond.transaction import Transaction
 
+from trytond.modules.product import round_price
+
 
 class Production(metaclass=PoolMeta):
     __name__ = 'production'
@@ -60,8 +62,7 @@ class Production(metaclass=PoolMeta):
                 cycle_cost = Decimal(cycle_cost)
             cost += cycle_cost
 
-        digits = self.__class__.cost.digits
-        return cost.quantize(Decimal(str(10 ** -digits[1])))
+        return round_price(cost)
 
     @classmethod
     @ModelView.button

tryton.cfg

@@ -3,6 +3,7 @@ version=5.5.0
 depends:
     company
     ir
+    product
     production
     production_routing
     stock

work.py

@@ -14,7 +14,7 @@ from trytond.pool import Pool
 from trytond.pyson import Eval, If, Bool
 from trytond.transaction import Transaction
 
-from trytond.modules.product import price_digits
+from trytond.modules.product import price_digits, round_price
 from .exceptions import PickerError
 
 
@@ -314,7 +314,6 @@ class WorkCycle(Workflow, ModelSQL, ModelView):
             if center.cost_method == 'cycle':
                 self.cost = center.cost_price
             elif center.cost_method == 'hour':
-                digits = self.__class__.cost.digits
                 hours = self.duration.total_seconds() / (60 * 60)
                 self.cost = center.cost_price * Decimal(str(hours))
-                self.cost = self.cost.quantize(Decimal(str(10 ** -digits[1])))
+                self.cost = round_price(self.cost)