searchlogic returns nil when I order my records

I can't figure out why ascend_by won't wo开发者_JAVA百科rk for me. Here's a console readout

>> tapes = Tape.search(:timestamp_gte => "1278361923")

=> blah blah blah

>> tapes.length

=> 1436

>> tapes.ascend_by_timestamp

=> nil

I get the same behavior when I use descend_by and other columns.

ruby 1.8.7

Rails 2.3.8

searchlogic 2.4.19

Well, I'm not sure why, but it looks like it works if you add in the scope at the same time. But (oddly) only if the ascend part comes first. So:

tapes = Tape.ascend_by_id.search(:timestamp_gte => "1278361923")

should work, while

tapes = Tape.search(:timestamp_gte => "1278361923").ascend_by_id

doesn't.