On Aug 4, 2010, at 5:31 PM, Jon Nelson wrote:
> It seems as though attributes which are dynamic_loaders cannot be told
> to eagerly load subattributes which are themselves dynamic_loaders.
that is correct. dynamic loaders are not backed by in-memory collections, and
no alternate loader strategies can be applied to them (last line of
http://www.sqlalchemy.org/docs/mappers.html#dynamic-relationship-loaders ).
>
> query = a_instance.b # gimme instances of B, query-like
> query = query.options(sa_orm.eagerload('c'))
>
> Then the following is broken:
>
> for b_instance in query:
>
> with this error:
>
>for b_instance in query:
> File "/usr/lib64/python2.6/site-packages/sqlalchemy/orm/query.py",
> line 1676, in instances
>rows = [process[0](row, None) for row in fetch]
> File "/usr/lib64/python2.6/site-packages/sqlalchemy/orm/mapper.py",
> line 2234, in _instance
>populate_state(state, dict_, row, isnew, only_load_props)
> File "/usr/lib64/python2.6/site-packages/sqlalchemy/orm/mapper.py",
> line 2113, in populate_state
>populator(state, dict_, row)
> File "/usr/lib64/python2.6/site-packages/sqlalchemy/orm/strategies.py",
> line 1109, in new_execute
>'append_without_event')
> File "/usr/lib64/python2.6/site-packages/sqlalchemy/util.py", line
> 1206, in __init__
>self._data_appender = getattr(data, via)
> AttributeError: 'list' object has no attribute 'append_without_event'
its broken in that there's a nasty exception. There should be a nice clean
exception saying you can't do that.ticket #1864 is added.
>
>
> This is with sqlalchemy 0.6.3
>
> --
> See, when the GOVERNMENT spends money, it creates jobs; whereas when
> the money is left in the hands of TAXPAYERS, God only knows what they
> do with it. Bake it into pies, probably. Anything to avoid creating
> jobs. - Dave Barry?
>
> Jon
>
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