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

[Chris Withers]

Hi All,

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?

cheers,

Chris

-- 
Simplistix - Content Management, Batch Processing & Python Consulting
            - http://www.simplistix.co.uk
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