On Dec 11, 2013, at 12:45 PM, Iain Duncan <iainduncanli...@gmail.com> wrote:
> On Tue, Dec 10, 2013 at 3:54 PM, Michael Bayer <mike...@zzzcomputing.com> > wrote: > > On Dec 10, 2013, at 5:04 PM, Iain Duncan <iainduncanli...@gmail.com> wrote: > >> Hi, I'm stuck on how to do something that I'm sure must be possible. >> >> I have two kinds of records, using table inheritance, Client, and >> SpecialClient. SpecialClient has extra fields and it's own polymorphic >> identity. I need to *promote* a and existing client record to a special >> client. I tried just making a SpecialClient and copying over attributes, but >> this is giving me "can't set attribute" error messages. Can anyone tell me >> what the *right* way to do change a polymorphic type, while keeping it's ID >> the same, would be? In my case, the ID in the derived type is an fkey to the >> base type table's id col. > > if its joined inheritance, you have to INSERT into the new table manually, > that feature isn’t supported right now. if it’s single, try emitting an > UPDATE for the “discriminator” column, then reloading the object. > > > I think it's joined inheritance? The derived table's primarky key is an "id" > column that is also an fkey to the base table's "id" column and the base > table has a "_type" column holding the poly id. Does this mean I should drop > into sql directly to create the record in the derived table and it will "just > work”? you need to manipulate the tables directly, and then totally reload the original object fresh. pretty much make the ORM think the previous Client never existed.
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