<%= 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 |message| %>
- <%= message %>
<% end %>
<% end %>
<%= f.label :product_id %>
<%= f.text_field :product_id %>
<%= f.label :cart_id %>
<%= f.text_field :cart_id %>
<%= f.submit %>
<% end %>