[storm] Reference to Proxy?

[BožoDragojevič]

Matthias Urlichs <matthias at ...> writes:

> 
> 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")
> 

I've uploaded the changes that were needed to 0.10 to pull this off at 
lp:~bozo-dragojevic-joost/storm/proxiable-references

Not sure it's directly useable with 0.14 -- I had some trouble when I tried
upgrading from 0.10, but don't remember if it was related to this or some other
local modifications that I did...

Bozzo