Change each element of array in Ruby
===

Ruby 1.9

I'm trying to do a trivial operation in Ruby. I want to change each element of array by adding some data to its property title as a prefix. 
   

    def my_proc
             @data = SomeTable.all
             @data.each { |d| 'my_title___'<< pt.title }
    end

What did I do wrong?