我需要基于两个下拉输入(分别来自货币和两种货币)生成一个url,这样,当用户单击“提交”按钮时,生成货币时,生成的url应该看起来像http：// localhost：3000 / currencies / usd-eur是usd,而to_currency是eur.

这是我的观点(index.html.erb)

 <%= semantic_form_for :calculator, :url => {:controller => "conversions", :action => "calculate" }  do |f| %>
      <p><%= f.label :amount %>
      <%= f.text_field :amount %></p>
      <p><%= f.label :from_currency %>
      <%= select :calculator, :from_currency, Choices['from_currency'] %></p>
      </p><%= f.label :to_currency %>
      <%= select :calculator, :to_currency, Choices['to_currency'] %></p>
       <p><%= f.submit "Calculate" %></p>
<%= end %>

routes.rb

match 'currencies', to: 'conversions#index', via: :get
match 'currencies/convert', to: 'conversions#calculate', as: :calculate, via: :post

控制器(conversions_controller.rb)

def index
 end

 def calculate
  @amount = params[:calculator][:amount]
  @from_cur = params[:calculator][:from_currency]
  @to_cur = params[:calculator][:to_currency]
  @result = ConversionsHelper.calculate(@from_cur, @to_cur, @amount)
 end

我没有任何模型可以解决此问题,因为我是从Google API获取数据的,因此我可能会超出RESFFUL约定的范围.详细的答案将不胜感激.谢谢.

解决方法:

此javascript代码最终解决了我的问题.

  $(document).ready(function(){
        $('#Cal').attr('action', '/currencies');
        $("#Cal").submit(function(e){            
            var from = $('#calculator_from_currency').val().toLowerCase();
            var to = $('#calculator_to_currency').val().toLowerCase();
            var url_end = from + "-" + to;
            var url = $('#Cal').attr('action') + '/' + url_end;
            $('#Cal').attr('action', url);            
        });
    });

然后,我在路线中添加了这一行.

  post '/currencies/:url' => 'conversions#calculate', via: [:post]