Delete duplicate entries from a 2 dimensional array in ror

rubyonrails-talk
1

I am trying to loop an array like this..

    @mem =     @tran = Transport.find_all_by_month_and_vehicle(date,vehicle)     tran.each do |t|       @mem << [Student.find_by_id(t.mem_id), t.transport_date, vehicle.no] if t.mem_type=="Student"       @mem << [Employee.find_by_id(t.mem_id), t.transport_date, vehicle.no] if t.mem_type=="Employee"     end

And in the view page I am looping it and displaying it like this

    @mem.each do |m|       <tr>                 <td><%= link_to m[0].first_name} %></td>                 <td > <%= m[0].age %></td>                 <td id="date"> m[1] </td>                 <td id="vehicle"> m[2] </td>       </tr>     <%end%>

But I am getting duplicates entries here..I need to remove duplicate entries from this.. How do I do it?? Kindly help