如何在Ruby on Rails中显示已删除元素的名称？

Question

I have a simple Rails application where I create objects (such as posts). So far I can edit and delete them, one by one, but now I want to have a <%= notice %> echoing the name of the deleted object after confirming its deletion. Is this possible? If so, how?

Answer 1

This is an extremely common task in Rails, and the idiomatic solution is to forward some data about the deleted record to the subsequent GET request via the the flash array.

Your controller's destroy action should look something like this:

def destroy
  @post = Post.find(params[:id])
  @post.destroy

  redirect_to posts_path, notice: "#{@post.name} was deleted"
end

In your index action, you'll be able to access flash[:notice] to get the string generated in the previous action.

Answer 2

You need to store the details you want to echo (eg the name) somewhere, because the object itself will be gone after a redirect. I would use the flash for that:

# in the controller
def destroy
  thing = Thing.find(params[:id])
  thing.destroy

  redirect_to things_path, :notice => "Thing #{thing.name} was deleted"
end

# in the index view
<% if flash[:notice] %>
  <div class="notice"><%= flash[:notice] %></div>
<% end %>