Hi,
playing with inheritance, I figured out that an inherited mapped class
passed to filter doesn't point to the correct table.
I have 2 classes, Catalog and CatalogChannel(Catalog).
Here is the syntax followed by the generated query:
query.filter(Catalog.c.id==CatalogChannel.c.id)
WHERE catalogs.id = catalogs.id
The generated query should be "WHERE catalogs.id = catalog_channels.id".
I can make this happend by explicitly using the table itself rather than
the class:
query.filter(Catalog.c.id==catalog_channel_table.c.id)
WHERE catalogs.id = catalog_channels.id
Should I open a ticket for that ?
Normaly, I would join(["A", "B"]) the tables between each other. But if
a "channel" relation only exists on the CatalogChannel class,
join("channel") wouldn't work as SA looks at superclass Catalog. I
thought it would naturally find the relationship by looking at the
polymorphic "type" column from Catalog, but it doesn't. Mike suggested
we would need to extend the API with a new method like
join_to_subclass() or so... Even though, I still think SA should figure
out which relation I'm looking at...
Regards,
--
Alexandre CONRAD
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