Ruby on Rails

Hi All
I never worked with RUBY my fisrt time.

I'd like to run this query by IRB and see how many line it will show
me :

select codigo, nome from teste

My database is postgre 8.4

Look what i did to do it:

irb(main):006:0> Post.find_by_sql "SELECT codigo, tirulo from teste"
NameError: uninitialized constant Post
from (irb):6
irb(main):007:0>

What is going on there?

Thanks

Grato

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