mapped attribute throws AttributeError: 'symbol' object has no attribute

[Adrian]

When I try to access a specific mapped attribute the error below is thrown but only if I use a custom __eq__(). 

    def __eq__(self, other):

        '''

        '''

        return self.aromatic_ring_id == other.aromatic_ring_id

When I print the type of both, the 'other' class is 'symbol': <class 'credoscript.models.aromaticring.AromaticRing'> <class 'sqlalchemy.util.langhelpers.symbol'>

Any ideas what went wrong?

---------------------------------------------------------------------------

AttributeError                            Traceback (most recent call last)

/home/adrian/<ipython console> in <module>()

/usr/local/lib/python2.7/dist-packages/SQLAlchemy-0.7.2-py2.7-linux-x86_64.egg/sqlalchemy/orm/attributes.pyc in __get__(self, instance, owner)

    166             return dict_[self.key]

    167         else:

--> 168             return self.impl.get(instance_state(instance),dict_)

    169 

    170 def create_proxied_attribute(descriptor):

/usr/local/lib/python2.7/dist-packages/SQLAlchemy-0.7.2-py2.7-linux-x86_64.egg/sqlalchemy/orm/attributes.pyc in get(self, state, dict_, passive)

    422                     value = ATTR_EMPTY

    423 

--> 424                 if value in (PASSIVE_NO_RESULT, NEVER_SET):

    425                     return value

    426                 elif value is ATTR_WAS_SET:

/home/adrian/Software/credoscript/models/aromaticring.py in __eq__(self, other)

     48         '''

     49         print type(self), type(other)

---> 50         return self.aromatic_ring_id == other.aromatic_ring_id

     51 

     52     def __ne__(self, other):

AttributeError: 'symbol' object has no attribute 'aromatic_ring_id'

[Michael Bayer]

Please try out the dev tip, 0.7.3, which is at http://hg.sqlalchemy.org/sqlalchemy/archive/default.tar.gz .  There's been a fix regarding attribute access upon objects that redefine __eq__(), which should never be called by SQLAlchemy and this looks like exactly that same issue.

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