如果在新页面上点击了link_to flash消息？

Question

查看

<% if current_user.challenges.badges.count > 0 %>
  <%= link_to new_duel_path(:challenge_daddy => @user.id), class: "btn", style: "padding-top: 10px; padding-bottom: 10px; margin-top: 15px; color: white;" do %>
    <span class='glyphicon glyphicon-tower'></span> Duel
  <% end %>
<% else %>
  # user will be sent to performance page
  <%= link_to performance_path, class: "btn", style: "padding-top: 10px; padding-bottom: 10px; margin-top: 15px; color: white;" do %>
    <span class='glyphicon glyphicon-tower'></span> Duel
  <% end %>
<% end %>

控制器

def performance
  @user = current_user
  # only if the user is brought to performance via the above link_to should this be flashed
  flash[:alert] =  "YOU'RE NOT AUTHORIZED TO INITIATE A DUEL UNTIL YOU BECOME A NINJA, BUT YOU CAN BE INVITED TO A DUEL"
end

我尝试直接在link_to发送Flash，但没有任何结果：link_to performance_path(:alert => "Flash message")也尝试(:error => "Flash message")

Answer 1

查看

<%= link_to performance_path(alert: true), class: "btn", style: "padding-top: 10px; padding-bottom: 10px; margin-top: 15px; color: white;" do %>
    <span class='glyphicon glyphicon-tower'></span> Duel
<% end %>

<强>控制器

def performance
  @user = current_user
  flash[:alert] = "YOU'RE NOT AUTHORIZED TO INITIATE A DUEL UNTIL YOU BECOME A NINJA, BUT YOU CAN BE INVITED TO A DUEL" if params[:alert].present?
end

效果观点

<% if flash[:alert] %>
    <%= flash[:alert] %>
<% end %>