Question

我在控制器中有一行会使用自定义Flash消息重定向到主屏幕，如下所示：

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

然后，用户将被重定向到以下页面：http://localhost:3000/home?alert=You+are+not+yet+assigned+to+an+experiment

但是，尽管所有其他Flash消息都在我的应用程序中工作，但不显示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>

我在这里做错了什么？

Answer 1

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] %>

如果你想通过参数传递它，你应该使用params [：param_name]

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

更优选Flash，它在页面间隐式工作，并在显示后清除

Answer 2

在您看来，您可以使用

访问通知Flash消息

<%= flash[:notice] %>

不

<%= notice %>

这同样适用于警报。

此外，您的代码中存在错误。

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

必须是

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

Rails Flash消息未显示

2 个答案: