configuration.py

#The COPYRIGHT file at the top level of this repository contains the full
#copyright notices and license terms.
from trytond.model import fields
from trytond.pool import Pool, PoolMeta
from trytond.pyson import Eval, Id


def default_func(field_name):
    @classmethod
    def default(cls, **pattern):
        return getattr(
            cls.multivalue_model(field_name),
            'default_%s' % field_name, lambda: None)()
    return default


class Configuration(metaclass=PoolMeta):
    __name__ = 'sale.configuration'
    pos_sequence = fields.MultiValue(fields.Many2One(
        'ir.sequence.strict', "Sale POS Sequence", required=True,
        domain=[
            ('company', 'in',
                [Eval('context', {}).get('company', -1), None]),
            ('sequence_type', '=', Id('sale_pos', 'sequence_type_sale_pos')),
            ]))
    ticket_report = fields.Many2One('ir.action.report', "Ticket Report")

    @classmethod
    def __register__(cls, module_name):
        super().__register__(module_name)
        table = cls.__table_handler__(module_name)
        table.not_null_action('ticket_report', action='remove')

    @classmethod
    def multivalue_model(cls, field):
        pool = Pool()
        if field == 'pos_sequence':
            return pool.get('sale.configuration.sequence')
        return super(Configuration, cls).multivalue_model(field)

    default_pos_sequence = default_func('pos_sequence')


class ConfigurationSequence(metaclass=PoolMeta):
    __name__ = 'sale.configuration.sequence'
    pos_sequence = fields.Many2One(
        'ir.sequence.strict', "Sale POS Sequence", required=True,
        domain=[
            ('company', 'in', [Eval('company', -1), None]),
            ('sequence_type', '=', Id('sale_pos', 'sequence_type_sale_pos')),
            ])

    @classmethod
    def default_pos_sequence(cls):
        pool = Pool()
        ModelData = pool.get('ir.model.data')
        try:
            return ModelData.get_id('sale_pos', 'sequence_sale_pos')
        except KeyError:
            return None