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我正在尝试实现的非常简单的过程。在主页或登录页面上，我想为电子邮件列表捕获电子邮件。如果电子邮件通过验证，它会被保存，太好了！没有错误时一切正常。

当出现仅输入“a”字符等错误时，如下面的日志所示。甚至只是一个空字符串，我不断得到相同的结果TypeError（无法将 nil 转换为字符串）

这是日志：

Started GET "/" for 127.0.0.1 at 2013-06-13 13:48:56 -0400
Connecting to database specified by database.yml
Processing by HighVoltage::PagesController#show as HTML
Parameters: {"id"=>"home"}
Rendered shared/_error_messages.html.erb (0.4ms)
Rendered layouts/_visitor_form.html.erb (7.9ms)
Rendered pages/home.html.erb within layouts/application (13.1ms)
Completed 200 OK in 82ms (Views: 39.6ms | ActiveRecord: 1.8ms)
[2013-06-13 13:48:57] WARN  Could not determine content-length of response body. Set       content-length of the response or set Response#chunked = true


Started POST "/visitors" for 127.0.0.1 at 2013-06-13 13:48:59 -0400
Processing by VisitorsController#create as HTML
Parameters: {"utf8"=>"✓",authenticity_token"=>"esTPNzNtkmNPTe7Jh+E2aDHNrgocU5Z8g49Nj0QiOhQ=",    "visitor"=>{"email"=>""}, "commit"=>"Add to newsletter list"}
(0.1ms)  begin transaction
Visitor Exists (0.2ms)  SELECT 1 AS one FROM "visitors" WHERE LOWER("visitors"."email") =     LOWER('') LIMIT 1
(0.1ms)  rollback transaction
Completed 500 Internal Server Error in 39ms

TypeError (can't convert nil into String):
app/controllers/visitors_controller.rb:12:in `create'

这是visitors_controller.rb

 def create
    @visitor = Visitor.new(params[:visitor])
     if @visitor.save
        flash[:success] = "Your email has been added!"
       redirect_to '/'
     else
       render '/'
     end
 end

我也试过

@visitor = Visitor.new(:visitor => params[:visitor][:email])

以及其他一些没有成功的序列。

如何获得不成功的保存以优雅地显示验证错误并允许用户重新提交。

这是布局：

    <%= form_for Visitor.new  do |f| %>
            <%= render 'shared/error_messages' %>
            <%= f.label :email %>
            <%= f.text_field :email %>

    <%= f.submit "Add to newsletter list", class: "btn btn-large btn-primary" %>
    <% end %>

也许高压宝石把我搞砸了。我没有足够的经验知道。

更新：

rake routes
visitors POST /visitors(.:format) visitors#create
home      /home(.:format)     pages#home
root      /                   high_voltage/pages#show {:id=>"home"}
page GET  /pages/*id          high_voltage/pages#show
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1 回答 1

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问题是，render '/'不呈现索引页面。您必须指定要呈现的操作页面。根据您的路线，此行应如下所示：

render 'pages/home'
于 2013-06-13T19:07:49.023 回答