===========================
Saturday, December 12, 2015
===========================

Ticket :ticket:`143` is advancing at full speed and seems to be
reaching an end.  We now have collective purchase invoices (SREG and
REG), :class:`lino_xl.lib.ledger.ui.MovementsByProject` shows the
new virtual field :attr:`voucher_partner
<lino_xl.lib.ledger.models.Movement.voucher_partner>` on a ledger
movement.  I worked on :ref:`welfare.specs.ledger`.

TODO:

- AAW aus den REG und SREG generieren.

I discovered and fixed a bug in
:meth:`lino.mixins.Registrable.get_row_permission`: the method is
supposed to refuse any non-readonly action on a registered object::


    def get_row_permission(self, ar, state, ba):
        if state and not state.editable:
            # BEFORE:
            # if not ar.bound_action.action.readonly:
            # AFTER:
            if not ba.action.readonly:  
                return False
        return super(Registrable, self).get_row_permission(ar, state, ba)


But fixing this bug revealed another, more subtle problem: The
"Deregister" action also is non-readonly. But we want to permit it on
registered objects. So we had to add yet another condition in above
code::

        if state and not state.editable and not isinstance(
                ba.action, ChangeStateAction):