in 1.9 without .to_report

results = puppen_tbl.select(:name,:race,:color,:recno).sort(+:color)

#<struct name="car1", year="1976", color="brown", recno=144>
#<struct name="car2", year="1976", color="brown", recno=3>
#<struct name="car3", year="1976", color="brown", recno=213>

with .to_report returns
kb.rb:25:in `<main>': undefined method `to_report' for #<Array:0x000000029b0bc0> (NoMethodError)

in 1.8
results = puppen_tbl.select(:name,:race,:color,:recno).sort(+:color).to_report

name  | year        | color | recno
-----------------------------------
car1 |  1974 | brown |   144
car2 |  1974 | brown |     3
car3 |  1974 | brown |   213