Ruby on Rails

I am trying to do a search where I can enter a part of a word and the
search find all occurrences of that part word in the field. The above
subject does not work. Can anyone help
I am using Rails 3 and ruby 1.9.2
I use to be able to do it in rails 2.x.
In my Model I have the following:-
def self.search(search_item)
if search_item
self.where('section = ?', '%:search_item%')
else
self.all
end
end

In my controller I have:-
@homepages = Homepage.search(params[:search])
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => @homepages }
format.js {render :js => @homepages}
end

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