def index
    @player_type = squad.player_types
  end

<%= form_tag({:action => :update}, :method => :put) do %>
 <%= render 'shared/error_messages' %>
<table>
        <% @player_types.order(:number).each do |p_type| %>
             ...do something...
<%end%>
<%end%>

<% if @player_types.errors.any? %>