[Zope3-Users] Accessing adapter methods from zpt

[Michael van Slingerland]

Hi James,

Thanks for your thorough explanation with examples, good stuff!

I had the feeling that views needed to be used but it looked so inefficient.
Is there a thought/philosophy behind the fact that we can't access
adapters directly from ZPT?

Thanks,
Mike

> Mike,
>
> When I started getting into adapters recently I
> discovered that you can't (easily) access adapters
> directly from ZPT. You will need to create a python
> view class as an intermediate step.
>
> Where you use a "context" statement to access
> properties of an object in ZPT, e.g.:
>
> <div class="field" tal:content="context/description"
> />
>
> you use a "view" statement to get at the methods of
> the Python View Class, e.g.:
>
> <div class="field" tal:content="view/rating" />
>
> You use the ZCML to wire up the ZPT to the Python,
> e.g.:
>
>   <page
>       name="someview.html"
>       for="dotted.path.to.IObject"
>       class=".pythonfile.ViewClass"
>       template="template.pt"
>       permission="zope.Public"
>       menu="zmi_views" title="View"/>
>
> Where python file is the file the viewclass is in,
> usually in the same browser folder, and ViewClass is
> the name of a class defined within that file.
>
> The ViewClass itself can do whatever logic you want to
> prepare data for the ZPT, but if it's just grabbing
> adapted methods and re-presenting them, it'll be
> something like this:
>
> from wherever import IAdapter
>
> class ViewClass:
>
>     def __init__ (self, context, request):
>         self.context = context
>         self.request = request
>
>         self.adaptation = IAdapter(context)
>
>     def method(self):
>         """Get the adapted doodle from the adapter"""
>         adapted = self.adaptation.adaptermeth()
>         return adapted
>
> Where "adaptermeth" is the method defined in your
> adapter, and "IAdapter" is the name of your adapter.
> You probably won't want to reference it as
> self.adaptation - call if something more meaningful -
> self.myimagefunction, or whatever.
>
> You will need to def a method for each adapted method
> you want to grab from adapters and pass to the ZPT.
>
> If you have more than one adapter you want to access
> from a given ZPT you need to make sure you import them
> all, and use a different "self.adapterdesc =" in the
> __init__, and you can then call each from the methods
> of the view class.
>
> Hope that helps,
> James
>
> --- Michael van Slingerland <z3uml at xs4all.nl> wrote:
>
>> Hi all,
>>
>> I've made an adapter on the image content type and
>> built a new view on the
>> IImage interface. But what I can't find anywhere is
>> how to access methods
>> defined in the adapter from ZPT?
>>
>> Anyone knows howto do this?
>>
>> Thanks,
>> Mike
>>
>> _______________________________________________
>> Zope3-users mailing list
>> Zope3-users at zope.org
>> http://mail.zope.org/mailman/listinfo/zope3-users
>>
>
>
>
>
> ___________________________________________________________
> To help you stay safe and secure online, we've developed the all new
> Yahoo! Security Centre. http://uk.security.yahoo.com
> _______________________________________________
> Zope3-users mailing list
> Zope3-users at zope.org
> http://mail.zope.org/mailman/listinfo/zope3-users
>