20120829

• Lino-Welfare: Miscellaneous translations. Added explicit blank=True to ChoiceList fields where necessary.

  “jobs.Contract [u’Datumsbereich 01.12.2011…31.12.2011 auxdferhalb Begleitungsperiode 01.08.2012….’] (1 object(s) with primary key 180)”

• Added i18n support (locale dirs) for modules lino.modlib.accounts and lino.modlib.ledger.

• New feature: Lino now supports writing dummy modules. A little change in lino.core.modeltools.resolve_app(), and a first example lino.modlib.postings.dummy used in lino_xl.lib.cal.

• New test application lino.test_apps.quantityfield.

  QuantityFields are implemented as CharFields and therefore should not be declared null=True. The message “Nullable CharField %s in %s” % (f.name,model) produced by lino.core.kernel.analyze_models() is now again a plain Exception.

  But if blank=True, empty strings are converted to None values.

• VoucherTypes caused problems because it had no blank_item:

  Exception
  Unresolved value '' for <class 'lino.modlib.ledger.models.VoucherTypes'>
  TRACEBACK:
    File "l:\snapshots\django\django\core\handlers\base.py", line 111, in get_response
      response = callback(request, *callback_args, **callback_kwargs)
    File "l:\snapshots\django\django\views\generic\base.py", line 58, in view
      return self.dispatch(request, *args, **kwargs)
    File "l:\snapshots\django\django\views\generic\base.py", line 79, in dispatch
      return handler(request, *args, **kwargs)
    File "t:\hgwork\lino\lino\ui\extjs3\views.py", line 603, in get
      elem = ar.create_instance()
    File "t:\hgwork\lino\lino\core\actions.py", line 739, in create_instance
      obj = self.actor.create_instance(self,**kw)
    File "t:\hgwork\lino\lino\core\table.py", line 887, in create_instance
      instance = self.model(**kw)
    File "l:\snapshots\django\django\db\models\base.py", line 361, in __init__
      setattr(self, field.attname, val)
    File "l:\snapshots\django\django\db\models\fields\subclassing.py", line 34, in __set__
      obj.__dict__[self.field.name] = self.field.to_python(value)
    File "t:\hgwork\lino\lino\utils\choicelists.py", line 462, in to_python
      return self.choicelist.to_python(value)
    File "t:\hgwork\lino\lino\utils\choicelists.py", line 328, in to_python
      raise Exception("Unresolved value %r for %s" % (value,cls))
  

  I completely removed the blank_item from ChoiceList and replaced it by None. My feeling (had already been saying before that this blank_item was a strange thing). But not yet sure whether there will be surprises…