Form just displays blank

index.html.erb

<%= form_for edit_multiple_game_flags_path(params[:game_id],@flags) do %>
  <table class="accordion">
    <thead>
      <tr>
        <th>Select</th>
        <th>Player</th>
      </tr>
    </thead>
    <tbody>
      <% @flags.each do |f| %>
      <tr>
        <td><%= check_box_tag "reportee_ids[]", f.player_id %></td>
        <td><%= f.player_id %></td>
      </tr>
      <% end %>
    </tbody>
  </table><!-- accordion -->
<% end %>

routes.rb

    resources :flags, :member do # don't think i need :member
      post :add
      get :remove
      get :index
      get :edit_multiple, :on => :collection
    end