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.. _topics-fields_default_value:
=======================
Default value of fields
=======================
When a record is created, each field, which doesn't have a value specified,
is set with the default value if exists.
The following class method::
Model.default_<field name>()
Return the default value for ``field name``.
This example defines an ``Item`` model which has a default ``since``::
import datetime
from trytond.model import ModelView, ModelSQL, fields
class Item(ModelSQL, ModelView):
"Item"
__name__ = 'item'
since = fields.Date('since')
@classmethod
def default_since(cls):
return datetime.date.today()
See also method ``Model.default_get``: :attr:`~trytond.model.Model.default_get`
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