I've learned something.
This:
ret = Title.search("Batman", :ranker => "expr(1)")
yields an error, but this
ret = Title.search("Batman", :ranker => "expr('1')")
works.
Further experimentation shows that the entire expression needs to be quoted.
Two samples:
# use each item's id as its rank. Because we prefer high ranks over low,
items are returned in
# order of descending id
#
ret = Title.search("Batman", :limit => 10000, :ranker =>
"expr('id')").map(&:id)
# use the expression 1000-id as rank. Because we prefer high ranks over
low, items are returned in
# order of ASCENDING id
ret = Title.search("Batman", :limit => 10000, :ranker => "expr('10000 -
id')").map(&:id)
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