[Zope3-dev] Re: Get a template resource object from code.

[Johan Carlsson]

Tres Seaver wrote:
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> Johan Carlsson wrote:
> 
>>No lock on the Zope3-users list I turn here.
>>
>>How do I get a page template resource object define in a named layer
>>from Python code?
> 
> 
> Look at what the handler for the <browser:resource> directive does:
> 
>   zope.app.component.metaconfigure.resource

Thanks Tres,
Already done that. It registers the resource as an adapter on the global 
site manger. Problem is I can't get the adapter, but gets an error.
The registration is somewhat strange in it self (adapts from layer 
interface to Interface interface???).

I cut and paste my post from the Zope3-users list:


Ok, so far I figured out the following:

1. Resources gets registered as adapters in the Global Site Manager.
2. The adapter is registerd to adapt from the current layer interface 
(defaults to IDefaultBrowserLayer) to the Interface interface (strange, 
why is that so I wounder?)
3. The layer interface I can look up byt calling: 
zapi.getUtility(ILayer, 'my_layer')

Ok, fine. So from my View class I try the following:

         gsm=zapi.getGlobalSiteManager()
         layer = zapi.getUtility(ILayer, 'my_test')
         adapter=gsm.queryAdapter(layer, Interface, 'test_me.html')


But this doesn't work, I get the following error:


Error type: exceptions.KeyError
Error object: <weakref at 02545900; to 'Surrogate' at 0210CAF0>

File "C:\Python24\Lib\site-packages\zope\publisher\publish.py", line 
138, in publish

File 
"C:\Python24\Lib\site-packages\zope\app\publication\zopepublication.py", 
line 164, in callObject

File "C:\Python24\Lib\site-packages\zope\publisher\publish.py", line 
113, in mapply

File "C:\Python24\Lib\site-packages\zope\publisher\publish.py", line 
119, in debug_call

File "C:\Zope\Zope31\lib\python\wfc\browser\metasite.py", line 44, in 
__call__
     adapter=gsm.queryAdapter(layer, Interface, 'test_me.html')

File "C:\Python24\Lib\site-packages\zope\component\site.py", line 70, in 
queryAdapter
     """Set all module' __file__ attribute to an absolute path"""

File "C:\Zope\Zope31\lib\python\zope\interface\adapter.py", line 414, in 
queryAdapter
     return self.adapter_hook(interface, object, name, default)

File "C:\Zope\Zope31\lib\python\zope\interface\adapter.py", line 404, in 
adapter_hook
     factory = self.lookup1(providedBy(object), interface, name)

File "C:\Zope\Zope31\lib\python\zope\interface\adapter.py", line 392, in 
lookup1
     return self.lookup((required,), provided, name, default)

File "C:\Zope\Zope31\lib\python\zope\interface\adapter.py", line 327, in 
lookup
     byname = s.get(provided)

File "C:\Zope\Zope31\lib\python\zope\interface\adapter.py", line 227, in get
     self.clean()

File "C:\Zope\Zope31\lib\python\zope\interface\adapter.py", line 146, in 
clean
     base.unsubscribe(self)

File "C:\Zope\Zope31\lib\python\zope\interface\adapter.py", line 248, in 
unsubscribe
     del self.dependents[dependent]

File "C:\Python24\lib\weakref.py", line 216, in __delitem__
     del self.data[ref(key)]


Can somebody sched a light on this problem?

Regards,
Johan


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