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