On Sep 30, 2010, at 4:47 PM, Dan wrote:
Hey,
I am trying to create a funky relationship where I want to take a
field in a table, take a portion of it and then use that portion to
create a relation. Is this even possible?
My relation is below
reseller = relation(Reseller,
uselist = False,
primaryjoin = func.substring(credits.c.billing_code, 3, 25) ==
Reseller.resellerid)
Any suggestions to make this happen?
Put viewonly=True on the relation, specify the foreign_keys and remote_side
arguments. Though dramatically simpler, just use a @property.
Also, here's a very old example that uses _local_remote_pairs to do it:
http://www.sqlalchemy.org/trac/attachment/ticket/610/cast_primaryjoin_example.py
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