Extend States for Model in Odoo 11

Question

I want to extend the "state" column of the mrp.production model. There was an example I found in https://www.odoo.com/de_DE/forum/how-to/developers-13/how-to-extend-fields-selection-options-without-overwriting-them-21529 but it seems to not work in odoo 11.

i.e. the __init__ signature changed to __init__(self, pool, cr) (guessing this from the error trace that I saw referencing model.__init__(pool, cr))

from odoo import models, fields
import logging

_logger = logging.getLogger(__name__)

class mrp_production(models.Model):
   _inherit = 'mrp.production'

   def __init__(self, pool, cr):
       super(mrp_production, self).__init__(pool, cr)
       states = self._columns['state'].Selection

       _logger.debug('extend state of mrp.production')

       state_other = ('other_state', 'My State')
       if state_other not in states:
           states.append(state_other)

The Error I'm receiving is:

AttributeError: 'mrp.production' object has no attribute '_columns'

Answer 1

You don't need to extend the __init__. Please look into the documentation to get a first look how to extend odoo business models.

For your example the correct code:

from odoo import models, fields

class MrpProduction(models.Model):
    _inherit = 'mrp.production'

    state = fields.Selection(
        selection_add=[('other_state', 'My State')])