Re: Automatically Triggering post_settattr After Value Assign by _*_default Method

Hmm..OK, let me take a look at it. I'll let you know what I find...

Dave Morrill

Alexander Michael wrote:
> On Thu, Jul 17, 2008 at 8:02 PM, David C. Morrill
> <dmorrill@...> wrote:
>   
>> Alexander Michael wrote:
>>     
>>> If have a TraitType with a post_setattr method. Is there a way to
>>> indicate that I would like the post_setattr to be called when the
>>> value is set by a default method?
>>>       
>> I don't think you need to indicate anything, it should just happen. I
>> you observe otherwise, please let me know...
>>     
>
> Hmm. Here's my example:
>
> import enthought.traits.api as traits
>
> class MyData(traits.HasTraits):
>     pass
>
> class MyObject(traits.HasTraits):
>     data = traits.Dict(traits.Str, traits.Instance(MyData))
>
> class MyObjectDataTrait(traits.BaseInstance):
>     def __init__(self, **metadata):
>         super(MyObjectDataTrait, self).__init__(MyData,
>             allow_none=True,
>             **metadata
>         )
>
>     def validate(self, object, name, value):
>         if (isinstance(object, MyObject)
>           and isinstance(value, MyData)):
>             return value
>         self.error(object, name, value)
>
>     def post_setattr(self, object, name, value):
>         print 'post_setattr', object, name, value
>         object.data[name] = value
>
> class MyDerivedObject(MyObject):
>     my_data = MyObjectDataTrait
>
>     def _my_data_default(self):
>         print '_my_data_default'
>         return MyData()
>
> obj = MyDerivedObject()
> print obj.my_data # post_setattr isn't executed
> #obj.my_data = MyData() # post_setattr is executed
>
> Should this work? My svn rev may be a few weeks old, I'll refresh it.
>
> Thanks,
> Alex
>
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