[Sqlalchemy-tickets] [sqlalchemy] #2176: error comparing assocation proxy of attribute mapped collection

[sqlalchemy <mi...@zz...>]

#2176: error comparing assocation proxy of attribute mapped collection
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    Reporter:  guest                   |        Type:  defect
      Status:  new                     |    Priority:  medium
   Milestone:                          |   Component:  access
    Severity:  no triage selected yet  |    Keywords:        
Status_field:  awaiting triage         |  
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 I discovered this while writing tests for a model which implements a
 dictionary-style access to a column of a related class. I can reproduce
 this on SQLAlchemy 0.6.6 and 0.6.7 (have not tried 0.7 yet) using the
 attached script. The resulting traceback is:
 {{{
 Traceback (most recent call last):
   File "bin/py", line 98, in <module>
     execfile(__file__)
   File "/tmp/x.py", line 54, in <module>
     assert art.attributes=={'foo': 'bar'}
   File
 "/Users/wichert/Library/eggs/SQLAlchemy-0.6.7-py2.7.egg/sqlalchemy/ext/associationproxy.py",
 line 179, in __get__
     proxy = self._new(_lazy_collection(obj, self.target_collection))
   File
 "/Users/wichert/Library/eggs/SQLAlchemy-0.6.7-py2.7.egg/sqlalchemy/ext/associationproxy.py",
 line 227, in _new
     self.collection_class = util.duck_type_collection(lazy_collection())
   File
 "/Users/wichert/Library/eggs/SQLAlchemy-0.6.7-py2.7.egg/sqlalchemy/ext/associationproxy.py",
 line 307, in __call__
     return getattr(obj, self.target)
   File
 "/Users/wichert/Library/eggs/SQLAlchemy-0.6.7-py2.7.egg/sqlalchemy/orm/attributes.py",
 line 168, in __get__
     instance_dict(instance))
   File
 "/Users/wichert/Library/eggs/SQLAlchemy-0.6.7-py2.7.egg/sqlalchemy/orm/attributes.py",
 line 392, in get
     return self.set_committed_value(state, dict_, value)
   File
 "/Users/wichert/Library/eggs/SQLAlchemy-0.6.7-py2.7.egg/sqlalchemy/orm/attributes.py",
 line 810, in set_committed_value
     collection.append_without_event(item)
   File
 "/Users/wichert/Library/eggs/SQLAlchemy-0.6.7-py2.7.egg/sqlalchemy/orm/collections.py",
 line 560, in append_without_event
     getattr(self._data(), '_sa_appender')(item, _sa_initiator=False)
   File
 "/Users/wichert/Library/eggs/SQLAlchemy-0.6.7-py2.7.egg/sqlalchemy/orm/collections.py",
 line 1418, in set
     key = self.keyfunc(value)
 TypeError: attribute name must be a string
 }}}

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Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2176>
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