<%= form_for([@country, @city]) do |f| %>
<% if @city.errors.any? %>
<%= pluralize(@city.errors.count, "error") %> prohibited this city from being saved:
<% @city.errors.full_messages.each do |msg| %>
- <%= msg %>
<% end %>
<% end %>
<%= f.label :name %>
<%= f.text_field :name %>
<%= f.label :country %>
<%= f.select :country_id, Country.scoped.map{|c| [c.name, c.id]}, prompt: '[Select]' %>
<%= f.submit %>
<% end %>