import sqlalchemy
def index_in(col, valuelist):
return sqlalchemy.case([(value,idx) for idx,value in enumerate
(valuelist)], value=col)
session.query(C).filter(C.someattr.in_(valuelist)).order_by(index_in
(C.someattr, valuelist))
Don't try to do this with huge lists of items.
On Feb 25,
Thanks. But using a CASE clause becomes objectionable in exactly those cases
where I would want to have the DB do the sorting — i.e. where the table is
big enough that just sorting the result set in python code using array index
(rows.sort(key=lambda row: values.index(row[0]))) would be a Bad
