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世界の国とその地域名を入手する方法

Last updated at Posted at 2015-01-18

世界の国とその地域名を入手する方法

Userモデルを使ってユーザーの出身国と州を入れてみる。

1. carmen-railsのgemを加える

Gemfile
gem 'carmen-rails'

保存したらbundle installする。

2.country_codeとstate_codeのカラムをUserに作成する
rails g migration AddCountryStateToUser

db/migration/2015xxxxxxxxx_add_country_state_to_user.rb
class AddCountryStateToUser < ActiveRecord::Migration
  def change
    add_column :users, :country_code, :string
    add_column :users, :state_code, :string
  end
end

3.入力フォームを作っていく

users/_form.html.erb
<div class="field">
  <%= f.label :country_code %><br />
  <%= f.country_select :country_code, prompt: 'Please select a country' %>
</div>
<div class="field">
  <%= f.label :state_code %><br />
  <%= render partial: 'subregion_select', locals: {parent_region: f.object.country_code} %>
</div>

4.ビューにpartialの行き先を作成してあげる

users/_subregion_select.html.erb
<div id="user_state_code_wrapper">
  <% parent_region ||= params[:parent_region] %>
  <% country = Carmen::Country.coded(parent_region)  unless parent_region.nil? %>

  <% if country.nil? %>
    <em>Please select a country above</em>
  <% elsif country.subregions? %>
    <%= subregion_select(:user, :state_code, parent_region) %>
  <% else %>
    <%= text_field(:user, :state_code) %>
  <% end %>
</div>

5.javascriptに国名を入力した後に州を選択できるようコードを書いてあげる

assets/javascripts/users.js.coffee
$ ->
  $('select#user_country_code').change (event) ->
    select_wrapper = $('#user_state_code_wrapper')

    $('select', select_wrapper).attr('disabled', true)

    country_code = $(this).val()

    url = "/users/subregion_options?parent_region=#{country_code}"
    select_wrapper.load(url)

6.ルートにユーザーの下にsubregionを加えてあげる

config/routes
resources :users do
    collection do
      get :subregion_options
    end
end

7.ユーザーコントローラーにsubregionを加えてあげる

controllers/users_controller.rb
  def subregion_options
    render partial: 'subregion_select'
  end

完成!!!!

参考サイト
https://github.com/jim/carmen-demo-app/

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