Ruby on rails 未显示Rails闪存消息

我在控制器中有一行代码，它将重定向到主屏幕，并显示一条自定义的flash消息，如下所示：

redirect_to :controller => :home, :action => :index, :alert => "You are not yet assigned to an experiment." and return

然后将用户重定向到以下页面：

http://localhost:3000/home?alert=You+是否+尚未+分配+到+实验

但是，虽然所有其他flash消息都在我的应用程序中工作，但不会显示flash消息。views/layouts/application.html.erb文件包含以下内容：

<div class="flash">
    <%- if !notice.nil? -%>
    <p class="notice"><%= notice %></p>
    <%- end -%> 
    <%- if !alert.nil? -%>
    <p class="alert"><%= alert %></p>
    <%- end -%>     
</div>

---

我做错了什么？

在您看来，您可以使用

<%= flash[:notice] %>

一定是

redirect_to({ :controller => :home, :action => :index }, :alert => "You are not yet assigned to an experiment.")

---

Flash正在使用会话来存储消息

flash[:alert] = "You are not yet assigned to an experiment."
redirect_to :controller => :home, :action => :index and return
<%= flash[:alert] %>

flash[：alert]=“您尚未分配到实验。”
重定向到：controller=>：home，：action=>：index并返回

如果要通过params传递，应使用params[：param_name]

redirect_to :controller => :home, :action => :index, :alert => "You are not yet assigned to an experiment." and return
<%= params[:alert] %>

重定向到：controller=>：home，：action=>：index，：alert=>“您还没有被分配到实验。”然后返回

---

Flash更可取，它可以隐式地跨页面工作，并且在显示后被清除

，如果我将

更改为

（以及

If

子句），仍然不会显示任何消息。谢谢，这正是我所需要的！

flash[:alert] = "You are not yet assigned to an experiment."
redirect_to :controller => :home, :action => :index and return
<%= flash[:alert] %>

redirect_to :controller => :home, :action => :index, :alert => "You are not yet assigned to an experiment." and return
<%= params[:alert] %>