Question

就像我昨天的第一个问题一样，我仍然在做that tutorial。

我遇到了Rails 2 / Rails 3路由差异的另一个问题。

所以我的问题是：你如何“翻译”这个：

<%= form_remote_tag(:controller => "posts", :action => "create") do %>

到Rails 3路由？

修改：这是我得到的错误代码：

Showing C:/Users/Lunasea/Web-Site/Standart/app/views/posts/_message_form.html.erb where line #5 raised: 

C:/Users/Lunasea/Web-Site/Standart/app/views/posts/_message_form.html.erb:5: syntax error, unexpected tASSOC, expecting '}'
...pend=  form_tag {:controller => "posts", :action => "create"...
C:/Users/Lunasea/Web-Site/Standart/app/views/posts/_message_form.html.erb:5: syntax error, unexpected ',', expecting '}'
...rm_tag {:controller => "posts", :action => "create"}, :remot...
C:/Users/Lunasea/Web-Site/Standart/app/views/posts/_message_form.html.erb:5: syntax error, unexpected tASSOC, expecting keyword_end
...action => "create"}, :remote => true do @output_buffer.safe_...
C:/Users/Lunasea/Web-Site/Standart/app/views/posts/_message_form.html.erb:12: syntax error, unexpected keyword_ensure, expecting keyword_end
C:/Users/Lunasea/Web-Site/Standart/app/views/posts/_message_form.html.erb:14: syntax error, unexpected $end, expecting keyword_end

_message_form.html.erb的内容：

<% if logged_in? %>
  <!--<% form_for product, :url => {:action => 'add_to_cart', :id => product.id}, :remote => true do %>-->
  <!--<%= form_remote_tag(:controller => "posts", :action => "create") do %>-->
  <%= form_for{:controller => "posts", :action => "create"}, :remote => true do %>
    <%= label_tag(:message, "What are you doing?") %><br />
    <%= text_area_tag(:message, nil, :size => "60x2") %><br />
    <%= submit_tag("Update") %>
  <% end %>
<% end %>

Answer 1

您使用了form_tag并将:remote => true传递给它......

form_tag :url => {:controller => 'posts', :action => 'create'}, :remote => true

（确保您已包含jQuery UJS或等效的原型库，因为Rails不再像过去那样包含javascript内联。）

Answer 2

我在这里引用Fernandez: The Rails 3 Way第11.13节

PrototypeHelper

PrototypeHelper已经过大量修改......删除了以下帮助方法并在官方Prototype Legacy Helper中提供


...

form_remote_for

form_remote_tag

这就是你错误的原因。您必须使用选项:remote => true将其转换为新语法，以指示远程调用（AJAX）。

所以以下内容应该有效：

<%= form_tag({:controller => "posts", :action => "create"}, {:remote => true}) do %>
  ...
<% end %>

请参阅API for Rails并在此处搜索form_tag以获取更多信息。

Answer 3

错误是说消息表单模板中存在语法问题。我的猜测是你错过了＆lt;％end％＆gt;关闭form_remote_tag调用中的do。

Answer 4

Rails 3中没有

form_remote_tag

使用

form_tag :url => {...}, :remote => true

代替

这意味着所有以前的remote_助手都是   从Rails核心中删除并放入Prototype Legacy Helper。至   将UJS挂钩到你的HTML中，你现在传递：remote =＆gt;相反，真的。   例如：

form_for @post，：remote =＆gt;真

http://edgeguides.rubyonrails.org/3_0_release_notes.html

Answer 5

您的问题是您使用来隐藏旧代码。 Rails仍将执行该代码。请改用以下格式：

<% if logged_in? %>
  <%-# form_for product, :url => {:action => 'add_to_cart', :id => product.id}, :remote => true do %>
  <%-#= form_remote_tag(:controller => "posts", :action => "create") do %>
  <%= form_for{:controller => "posts", :action => "create"}, :remote => true do %>
    <%= label_tag(:message, "What are you doing?") %><br />
    <%= text_area_tag(:message, nil, :size => "60x2") %><br />
    <%= submit_tag("Update") %>
  <% end %>
<% end %>

将Rails 2路由转换为Rails 3

5 个答案: