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List:       trac
Subject:    [Trac] Re: Confused about "PathOption" in a plugin/macro
From:       Noah Kantrowitz <noah () coderanger ! net>
Date:       2009-10-31 3:38:31
Message-ID: 4B1FF2A6-233B-4090-A2D1-5D54BC5DD7B6 () coderanger ! net
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On Oct 30, 2009, at 2:01 PM, David Chase wrote:

>
>
> On 2009-10-30, at 4:42 PM, Noah Kantrowitz wrote:
>
>> The *Option classes are accessors, you use them in the context of
>> the class
>> definition like this:
>>
>> class Blah(Component):
>>   latex_path = PathOption('fss', etc etc)
>>
>>   def my_plugin_function(self, req):
>>       print self.latex_path
>
> Thanks, but that's not actually helping me  (and fortunately, I
> figured out another way to make this work, but from the POV of did you
> explain this in terms that a new-to-Python person could make sense of,
> I'm afraid you didn't).
>
> Is there something special about class definition context?
>
> Why would printing "self.latex_path" yield the desired string, instead
> of <Pathoption ... > like you get from "str"?
>
> This looks like the same sort of thing I was doing -- treating it as
> if it were a String -- but you get a different result.  How?  Why?

Yes, when you access it through self (through an object) you get the  
value from the config. If you access it via the class  
(Blah.latex_path) you get the PathOption object. Its a bit of magic in  
how Python does attribute lookups, it ends up invoking code within the  
PathOption object which ends up returning the config value. You should  
definitely use the *Option classes in favor of the direct self.config  
access so you get the auto-magic stuff in the IniAdmin plugin (and  
anything else that introspects those, like the TracIni macro).

--Noah

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