results = cars_tbl.select(:name,:race,:color,:recno).sort(+:color).class
#<struct #<Class:0x10331b358> recno=9, name="car1", date="1974", color="brown", age=1, bought=#<Date: 4861389/2,0,2299161>, inhouse=false>

1.9

#<struct recno=9, name="car2", date="1974", color="brown", age=1, bought=#<Date: 1942-12-01 ((2430695j,0s,0n),+0s,2299161j)>, inhouse=false>
root@debian:/home/kbtests#




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