anchor.diff:          <% if @observations %>
             <% @observations.values_at(1, 3, 5).reject(&:nil?).each do |obs| %>
               <%= thumbnail(obs.thumb_image,
  -                          link: {controller: obs.show_controller, action: obs.show_action, id: obs.id},
  +                          link: {controller: obs.show_controller,
  +                                 action: obs.show_action, id: obs.id},
                             votes: true) %>
             <% end %>
           <% end %>
  
positive.code:   end
  
    tabs = [
      link_to(:show_user_contributors.t, controller: :users,
              action: :by_contribution)
    ]
    if @show_user == @user
      tabs += [
  
negative.code:         <% if @observations %>
            <% @observations.values_at(0, 2, 4).reject(&:nil?).each do |obs| %>
              <%= thumbnail(obs.thumb_image,
                            link: {controller: obs.show_controller,
                                   action: obs.show_action, id: obs.id},
                            votes: true) %>
            <% end %>
          <% end %>
  