[storm] Reference to Proxy?

[Matthias Urlichs]

Hi,

I have a database that's structured like a reverse infoheritance model,
i.e. there's a main table with basic object relationship info, and a huge
heap of detail tables with different content.


Sort of like this:

class Base(object):
    __storm_table__ = "base"
    id = Int(primary=True) # my ID

    parent_id = Int()      # one of several r'ship fields
    parent = Reference(parent_id,id)

    discriminator = Int()  # which detail table to use?

class DetailBase(object):
    id = Int(primary=True)
    ref = Reference(id,Base.id) # points to the Base table, obviously
    parent = Proxy(ref,Base.parent)
    
class DetailOne(DetailBase):
    _discriminator = 1 # associated with Base.discriminator via a metaclass,
                       # irrelevant for now
    def __init__(self):
        self.parent = None

Storm crashes on the last line:

  File "/usr/lib/python2.5/site-packages/storm/references.py", line 418, in __set__
    return self._remote_prop.__set__(self._reference.__get__(obj), value)
  File "/usr/lib/python2.5/site-packages/storm/references.py", line 399, in __get__
    obj._remote_prop = resolver.resolve_one(obj._unresolved_prop)
  File "/usr/lib/python2.5/site-packages/storm/references.py", line 887, in resolve_one
    return _find_descriptor_obj(self._used_cls, property)
  File "/usr/lib/python2.5/site-packages/storm/references.py", line 916, in _find_descriptor_obj
    raise RuntimeError("Reference used in an unknown class")

This seems not to work because the proxy points to a reference.

What would it take to fix that? Is there a workaround?

I already tried to modify DetailBase like this:
    parent_id = Proxy(_obj, _BaseObject.parent_id)
    parent = Reference(parent_id,BaseObject.id)

  File "/usr/lib/python2.5/site-packages/storm/references.py", line 183, in __set__
    self._relation.unlink(get_obj_info(local), remote_info, True)
  File "/usr/lib/python2.5/site-packages/storm/references.py", line 715, in unlink
    local_vars[local_column].set(None)

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