sale.py

import logging
from trytond.model import Workflow, ModelView, ModelSQL, fields
from trytond.pyson import Eval, Or, And, Not, Bool, Equal
from trytond.wizard import Wizard, StateView, StateTransition, Button
from trytond.transaction import Transaction
from trytond.pool import Pool, PoolMeta
from trytond.rpc import RPC


__metaclass__ = PoolMeta


log = logging.getLogger(__name__)


class Sale(Workflow, ModelSQL, ModelView):
    "Sale"

    __name__ = 'sale.sale'

    _description = __doc__

    _rec_name = 'id'

    @classmethod
    def __setup__(cls):
        super(Sale, cls).__setup__()
        cls._buttons.update({
            'cancel': {
                'invisible': ~(Eval('state').in_(['draft', 'quotation']) |
                    (Eval('state').in_(['processing']) &
                     Eval('shipment_state').in_(['none', 'exception']) &
                     Eval('invoice_state').in_(['none', 'exception']))),
            },
        })
        cls._transitions |= set([('processing', 'cancel')])