Enforce positive timedelta

issue11869
review421921004

configuration.py

@@ -6,7 +6,7 @@ from trytond.model import (
 from trytond.modules.company.model import (
     CompanyMultiValueMixin, CompanyValueMixin)
 from trytond.pool import Pool
-from trytond.pyson import Eval, Id
+from trytond.pyson import Eval, Id, TimeDelta
 from trytond.tools.multivalue import migrate_property
 
 purchase_invoice_method = fields.Selection(
@@ -36,7 +36,12 @@ class Configuration(
                 ]))
     purchase_invoice_method = fields.MultiValue(purchase_invoice_method)
     get_purchase_invoice_method = get_purchase_methods('invoice_method')
-    purchase_process_after = fields.TimeDelta("Process Purchase after",
+    purchase_process_after = fields.TimeDelta(
+        "Process Purchase after",
+        domain=['OR',
+            ('purchase_process_after', '=', None),
+            ('purchase_process_after', '>=', TimeDelta()),
+            ],
         help="The grace period during which confirmed purchase "
         "can still be reset to draft.\n"
         "Applied only if a worker queue is activated.")

party.py

@@ -6,11 +6,20 @@ from trytond.modules.company.model import (
     CompanyMultiValueMixin, CompanyValueMixin)
 from trytond.modules.party.exceptions import EraseError
 from trytond.pool import Pool, PoolMeta
-from trytond.pyson import Eval
+from trytond.pyson import Eval, TimeDelta
 
 supplier_currency = fields.Many2One(
     'currency.currency', "Supplier Currency",
     help="Default currency for purchases from this party.")
+supplier_lead_time = fields.TimeDelta(
+    "Lead Time",
+    domain=['OR',
+        ('supplier_lead_time', '=', None),
+        ('supplier_lead_time', '>=', TimeDelta()),
+        ],
+    help="The time from confirming the purchase order to receiving "
+    "the goods from the party when used as a supplier.\n"
+    "Used if no lead time is set on the product supplier.")
 
 
 class Party(CompanyMultiValueMixin, metaclass=PoolMeta):
@@ -20,10 +29,7 @@ class Party(CompanyMultiValueMixin, metaclass=PoolMeta):
             " as customer."))
     customer_codes = fields.One2Many(
         'party.party.customer_code', 'party', "Customer Codes")
-    supplier_lead_time = fields.MultiValue(fields.TimeDelta("Lead Time",
-            help="The time from confirming the purchase order to receiving "
-            "the goods from the party when used as a supplier.\n"
-            "Used if no lead time is set on the product supplier."))
+    supplier_lead_time = fields.MultiValue(supplier_lead_time)
     supplier_lead_times = fields.One2Many(
         'party.party.supplier_lead_time', 'party', "Lead Times")
     supplier_currency = fields.MultiValue(supplier_currency)
@@ -52,7 +58,7 @@ class SupplierLeadTime(ModelSQL, CompanyValueMixin):
             'company': Eval('company', -1),
             },
         depends={'company'})
-    supplier_lead_time = fields.TimeDelta("Lead Time")
+    supplier_lead_time = supplier_lead_time
 
 
 class PartySupplierCurrency(ModelSQL, ValueMixin):

product.py

@@ -12,7 +12,7 @@ from trytond.model import (
 from trytond.modules.currency.fields import Monetary
 from trytond.modules.product import price_digits
 from trytond.pool import Pool, PoolMeta
-from trytond.pyson import Bool, Eval, If
+from trytond.pyson import Bool, Eval, If, TimeDelta
 from trytond.tools import is_full_text, lstrip_wildcard
 from trytond.transaction import Transaction
 
@@ -285,7 +285,12 @@ class ProductSupplier(
     company = fields.Many2One(
         'company.company', "Company",
         required=True, ondelete='CASCADE')
-    lead_time = fields.TimeDelta('Lead Time',
+    lead_time = fields.TimeDelta(
+        "Lead Time",
+        domain=['OR',
+            ('lead_time', '=', None),
+            ('lead_time', '>=', TimeDelta()),
+            ],
         help="The time from confirming the purchase order to receiving the "
         "products.\n"
         "If empty the lead time of the supplier is used.")