[Zope-dev] can't register adapters for classes with metaclasses

[Tres Seaver]

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On 02/27/2011 06:24 AM, Chris Withers wrote:

> This is particularly problematic when using the common case of 
> SQLAlchemy declaratively mapped model classes.
> 
> The attached unit test when run will fail with:
> 
> Error in test test_provideAdapter (test_sa.TestAdapter)
> Traceback (most recent call last):
>    File "/usr/local/lib/python2.6/unittest.py", line 279, in run
>      testMethod()
>    File "test_sa.py", line 25, in test_provideAdapter
>      provideAdapter(MyAdapter,Model)
>    File 
> "zope.component-3.10.0-py2.6.egg/zope/component/globalregistry.py", line 
> 72, in provideAdapter
>      base.registerAdapter(factory, adapts, provides, name, event=False)
>    File "zope.component-3.10.0-py2.6.egg/zope/component/registry.py", 
> line 182, in registerAdapter
>      required = _getAdapterRequired(factory, required)
>    File "zope.component-3.10.0-py2.6.egg/zope/component/registry.py", 
> line 414, in _getAdapterRequired
>      for r in required:
> TypeError: 'DeclarativeMeta' object is not iterable
> 
> Why is that and how should I register an adapter against such a class?

UTSL:  the 'required' argument passed to 'registerAdapter' is supposed
to be a sequence of interfaces or classes, not a single interface or
class.  If a class, then it must be something which can be passed to
'implementedBy'.


Tres.
- -- 
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Tres Seaver          +1 540-429-0999          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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