tryton add button presupuesto.py

from trytond.model import Workflow, ModelView, ModelSQL, fields
from trytond.wizard import Wizard, StateView, StateTransition, Button
from trytond.transaction import Transaction
from trytond.pool import Pool

class Presupuesto(ModelSQL, ModelView):
    'Presupuesto'
    _name = 'presupuesto.presupuesto'
    _description = __doc__
    name = fields.Char('Name')
    greeting = fields.Char('Greeting')
    edad = fields.Char('Edad')
    state = fields.Selection([
        ('draft', 'Draft'),
        ('quotation', 'Quotation'),
        ('confirmed', 'Confirmed'),
        ('processing', 'Processing'),
        ('done', 'Done'),
        ('cancel', 'Canceled'),
    ], 'State', readonly=False, required=False)
    def __init__(self):
        super(Presupuesto, self).__init__()

        self._buttons.update({
                'cancel': {
                    'invisible': ((Eval('state') == 'cancel')
                        | (~Eval('state').in_(['draft', 'quotation'])
                            & (Eval('invoice_state') != 'exception')
                            & (Eval('shipment_state') != 'exception'))),
                    },
                'draft': {
                    'invisible': Eval('state') != 'quotation',
                    },
                'quote': {
                    'invisible': Eval('state') != 'draft',
                    'readonly': ~Eval('lines', []),
                    },
                'confirm': {
                    'invisible': Eval('state') != 'quotation',
                    },
                'process': {
                    'invisible': Eval('state') != 'confirmed',
                    },
                })
        # The states where amounts are cached
        self._states_cached = ['confirmed', 'processing', 'done', 'cancel']

    @ModelView.button
    @Workflow.transition('cancel')
    def cancel(self, ids):
        import pdb; pdb.set_trace()
        self.store_cache(ids)

Presupuesto()