refactor & test demo

checkout.rb

def checkout
  m = @merchant_data
  seller_id = m["_id"]
  unfulfillable_items = get_invalid_cart_items
  if unfulfillable_items.present?
    render status: :unprocessable_entity, json: { message: I18n.t('orders.error.fulfillment_error'), data: unfulfillable_items}
    return
  end

  delivery_option_id = params.fetchpath("order/delivery_option/_id")
  payment_method_id = params.fetchpath("order/payment_method/_id")

  # 這邊在整理參數讓給這方法最後可以去跟 api 要資料，但這部份應該抽出來成方法，才能驗證結果等等，不然測試很難測到這段。除非準備一堆真的資料去跑
  # delivery = DeliveryOption.find(delivery_option_id)
  # delivery = DeliveryOption.find(delivery_option_id)
  delivery_address = params.fetchpath('order/delivery_address',{})
  if (delivery_address.has_key?("country"))
    country_code =delivery_address.fetch("country","")
    if (country_code != "")
      country = ISO3166::Country.find_country_by_alpha2(country_code)
      delivery_address["country_code"] = country_code
      delivery_address["country"] = country_code == 'TW' ? I18n.t('countries.TW') : country.name
    end
  end
  
  # 又一堆應該抽出去成獨立方的邏輯
  # save user information! --------------
  save_fields = params[:saveFields]
  if !user_signed_in? # user is not signed in
    email = params.fetchpath("order/customer_email",nil)
    render status: :unprocessable_entity, json: { message: I18n.t('themes.orders.email_required')} and return if email.blank?
    @customer = find_or_create_by_email email
    # wants to create account
    if save_fields['all'] == true && !@customer.is_password_set
      @sl_client.put("#{@customer.owner_id}/users/#{@customer.id}/send_notification",{:type=>"shop_welcome_password_notification"})
    end
  else # user is signed in
    @customer = current_user
  end

  # 後面都是做不同目的雜七雜八的邏輯
  # blahblahblahblahblahblahblahblahblahblahblahblahblahblahblah
  # blahblahblahblahblahblahblahblahblahblahblahblahblahblahblah
end