Ruby on Rails

Hey all,
          I am trying to list students in alphabetical order starting from a to z but using search logic I unable to do that. can any one help me out.
          These lines are in controller

           @search = Student.search(params[:search])
          @students+=@search.all

View
    <% @students= @students.sort_by(&:last_name) %>
 i am able to sort it but not in alphabetical order. Help me


Cheers,
Kp

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