Re: How to edit dexterity types without needing to know about their behaviors

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Johannes Raggam wrote:
> On Fri, 2014-03-14 at 11:25 +0100, Johannes Raggam wrote:
>> On Fri, 2014-03-14 at 02:46 -0700, ajung wrote:
>>> ajung wrote
>>>> johannes raggam wrote
>>>>> i'll fix that, probably at the wine and beer sprint. but then
>>>>> you'll still always get UTC datetime values instead of
>>>>> localized ones, if you get the start/end attributes directly
>>>>> from the context.
>>>>> 
>>>>>> Consistency-is-king Andreas
>>>>> pragmatism is okay. johannes
>>> Here are the facts why plone.app.event currently freaks me out.
>>> 
>>> The source 'start' object is v = DateTime('2008/09/09 09:00:00
>>> GMT+2') which translates to 07:00 UTC.
>>> 
>>> The migration code tries to concert the DateTime instance to a
>>> Python datetime instance with UTC timezone and setting the
>>> 'timezone' of the event object to 'Etc/GMT+2' using
>>> 
>>> v = v.asdatetime() tz = str(v.tzinfo) if tz.startswith('GMT'): tz
>>> = 'Etc/%s' % tz new_obj.timezone = tz acc =
>>> IEventAccessor(new_obj) v =
>>> v.replace(tzinfo=pytz.timezone('UTC')) setattr(acc, k, v)
>> first, are you sure, that you want to use Etc/GMT+2 as timezone?
>> Etc/GMT is not GMT, see the answer here: 
>> http://answers.yahoo.com/question/index?qid=20090707145844AANnghH
>> 
>>>>> import pytz from datetime import datetime vie =
>>>>> pytz.timezone('Europe/Vienna') etc =
>>>>> pytz.timezone('Etc/GMT+2') dt = vie.localize(datetime.now()) 
>>>>> dt
>> datetime.datetime(2014, 3, 14, 11, 13, 11, 629280,
>> tzinfo=<DstTzInfo 'Europe/Vienna' CET+1:00:00 STD>)
>>>>> dt.astimezone(etc)
>> datetime.datetime(2014, 3, 14, 8, 13, 11, 629280,
>> tzinfo=<StaticTzInfo 'Etc/GMT+2'>)
>> 
>> then, just set the timezone on the accessor and start and end
>> datetime as floating datetimes. if you don't have multiple timezone
>> in the portal you are migrating, that shouldn't be a problem.
> 
> ... and make sure the ObjectModifiedEvent is fired, so that the 
> data_postprocessing event handler is executed.

This is yet another reason why the implementation is _broken_ - I wonder
how one can design and implement such a simple functionality this way.
This is just scary.

- -aj


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