On Sep 7, 2011, at 11:53 AM, werner wrote:
> Michael,
>
> On 09/07/2011 05:10 PM, Michael Bayer wrote:
>> On Sep 7, 2011, at 4:40 AM, werner wrote:
>>
>>> or:
>>> Region_LV.language = sao.relationship('Language',
>>> primaryjoin="Country_LV.fk_language_id==Language.id",
>>> foreign_keys=[Country_LV.__table__.c.fk_language_id])
>>>
>>> I get:
>>> sqlalchemy.exc.ArgumentError: Column-based expression object expected for
>>> argument 'foreign_keys'; got: 'Country_LV.fk_language_id', type<type 'str'>
>> this one above is the one that doesn't make any sense (also its probably how
>> the relationship should be set up).
> Sorry that was a copy/paste error on my part.
>> Clearly x.__table__.c.somename is a Column object, not a string.
>> Something is up with what you're sending it. I've tried to reproduce
>> with no luck. See attached. Also I don't even need the
>> primaryjoin/foreignkeys if the originating Table upon which the view is
>> based has foreign keys to the parent.
>>
> The additional column is in my case added in to the view as the base table
> doesn't have it and it is filled by the stored procedure (which combines the
> base table plus the localized table ...) , i.e.:
>
> def view(name, metadata, selectable):
> t = table(name)
>
> for c in selectable.c:
> c._make_proxy(t)
>
> lc = sasql.column("stuff_id", sa.Integer)
> t.append_column(lc)
>
> But what I had overlooked/forgotten to include was the "__mapper_args__ =
> {"primary_key":__table__.c.id}" line.
>
> After adding this the relationship as shown at the beginning it works.
well that's also strange. If the mapper is not able to find a primary key,
the error is very clear:
sqlalchemy.exc.ArgumentError: Mapper Mapper|MSView|msview could not assemble
any primary key columns for mapped table 'msview'
not sure why that isn't what you were seeing.
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