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

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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.