<%= form_for(@line_item) do |f| %>
<% if @line_item.errors.any? %>
<%= pluralize(@line_item.errors.count, "error") %> prohibited this line_item from being saved:
<% @line_item.errors.full_messages.each do |msg| %>
- <%= msg %>
<% end %>
<% end %>
<%= f.label :product_id %>
<%= f.number_field :product_id %>
<%= f.label :cart_id %>
<%= f.number_field :cart_id %>
<%= f.submit %>
<% end %>