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#This file is part of Tryton. The COPYRIGHT file at the top level of
#this repository contains the full copyright notices and license terms.
from trytond.model.fields.field import Field
class Many2One(Field):
'''
Define many2one field (``int``).
'''
_type = 'many2one'
def __init__(self, model_name, string='', left=None, right=None,
ondelete='SET NULL', datetime_field=None, help='', required=False,
readonly=False, domain=None, states=None, change_default=False,
select=False, on_change=None, on_change_with=None, depends=None,
order_field=None, context=None, loading='eager'):
'''
:param model_name: The name of the target model.
:param left: The name of the field to store the left value for
Modified Preorder Tree Traversal.
See http://en.wikipedia.org/wiki/Tree_traversal
:param right: The name of the field to store the right value. See left
:param ondelete: Define the behavior of the record when the target
record is deleted. (``CASCADE``, ``RESTRICT``, ``SET NULL``)
``SET NULL`` will be changed into ``RESTRICT`` if required is set.
:param datetime_field: The name of the field that contains the datetime
value to read the target record.
'''
self.__required = required
if ondelete not in ('CASCADE', 'RESTRICT', 'SET NULL'):
raise Exception('Bad arguments')
self.ondelete = ondelete
if datetime_field:
if depends:
depends.append(datetime_field)
else:
depends = [datetime_field]
super(Many2One, self).__init__(string=string, help=help,
required=required, readonly=readonly, domain=domain,
states=states, change_default=change_default, select=select,
on_change=on_change, on_change_with=on_change_with,
depends=depends, order_field=order_field, context=context,
loading=loading)
self.model_name = model_name
self.left = left
self.right = right
self.datetime_field = datetime_field
def __get_required(self):
return self.__required
def __set_required(self, value):
self.__required = value
if value and self.ondelete == 'SET NULL':
self.ondelete = 'RESTRICT'
required = property(__get_required, __set_required)
__init__.__doc__ += Field.__init__.__doc__
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