index.html.haml

%h1 Prospects
- unless @prospects.empty?
  %table
    %tr
      %th Organization
      %th Location
      %th Url
      %th Org url

    - for stage, prospects in @prospects_by_stage
      %tr
        %th= ProspectStage[stage].name
      - for prospect in prospects
        %tr
          %td= prospect.organization
          %td= h prospect.location
          %td= auto_link prospect.url
          %td= auto_link prospect.url
          %td= link_to 'Show', prospect
          %td= link_to 'Edit', edit_prospect_path(prospect)
          %td= link_to 'Destroy', prospect, :confirm => 'Are you sure?', :method => :delete
- else
  %p You haven't entered any prospects!

= link_to 'New prospect', new_prospect_path

prospects_controller.rb

def index
    @prospects = Prospect.find_all_by_user_id current_user.id
    @prospects_by_stage = partition_by_stage(@prospects)

    respond_to do |format|
      format.html # index.html.erb
      format.xml  { render :xml => @prospects }
    end
  end

  def partition_by_stage(prospects)
    returned_hash = {}
    stages = prospects.collect {|prospect| prospect.stage}
    stages.each do |stage|
      returned_hash[stage] = prospects.select {|prospect| prospect.stage == stage}
    end
    returned_hash
  end