32 lines
1.1 KiB
Python
32 lines
1.1 KiB
Python
# This file is part of Tryton. The COPYRIGHT file at the toplevel of this
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# repository contains the full copyright notices and license terms.
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from sql import Column
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from trytond.i18n import lazy_gettext
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from trytond.model import Index, fields
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def sequence_ordered(
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field_name='sequence',
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field_label=lazy_gettext('ir.msg_sequence'),
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order='ASC NULLS FIRST'):
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"Returns a mixin to order the model by order fields"
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assert order.startswith('ASC')
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class SequenceOrderedMixin(object):
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"Mixin to order model by a sequence field"
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__slots__ = ()
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@classmethod
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def __setup__(cls):
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super(SequenceOrderedMixin, cls).__setup__()
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table = cls.__table__()
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cls._order = [(field_name, order)] + cls._order
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cls._sql_indexes.add(
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Index(table,
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(Column(table, field_name), Index.Range(order=order)),
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(table.id, Index.Range(order=order))))
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setattr(SequenceOrderedMixin, field_name, fields.Integer(field_label))
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return SequenceOrderedMixin
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