On May 18, 2007, at 12:00 PM, Glauco wrote:
>
> i all my mapper i use this property frequently:
>
> @property
> def changed(self):
> return self._state.get('modified')
>
_state is not public and is not always going to be set, and does not
account for "mutable" properties like pickled types. a better way is
to say "obj in session.dirty".
> but in some cases ( 1:n relation ) mapper this don't work:
>
>
> In [1]: o =Operatore.select()[4]
>
> In [2]: o._state.get('modified')
> Out[2]: False
>
> In [3]: o.groups[0].acl_cod_ruolo
> Out[3]: u'VET'
>
> In [4]: o.groups[0].acl_cod_ruolo = '123'
>
> In [5]: o.groups[0].acl_cod_ruolo
> Out[5]: '123'
>
> In [6]: o.groups[0]._state.get('modified')
> Out[6]: True
>
> In [7]: o._state.get('modified')
> Out[7]: False
>
>
>
> Why the parent self._state['modified'] don't get the changes from
> childs
> mappers sometimes?
> i'm doing something wrong?
_state gets set as the result of a change event on the instance. it
doesnt get propigated to parent instances though, there shouldnt be
any case that this happens. you may observe it occuring as the
result of a bi-directional relationship in some cases. above you are
changing the instance at o.groups[0], but that has no effect on "o".
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