如何使用Rails将从表单上传的文件显示到另一个视图？

<%= form_for @model, url: { action: "upload" }, html: { multipart: true } do |f| %>
  <%= f.file_field :file %>
  <%= f.submit "Upload" %>
<% end %>

def upload
  uploaded_file = params[:model][:file]
  file_path = Rails.root.join('public', 'uploads', uploaded_file.original_filename)

  File.open(file_path, 'wb') do |file|
    file.write(uploaded_file.read)
  end

  flash[:file_path] = file_path
  redirect_to action: "show"
end

def show
  @file_path = flash[:file_path]
end

<% if @file_path.present? %>
  <% if File.extname(@file_path) == ".jpg" || File.extname(@file_path) == ".png" %>
    <%= image_tag @file_path %>
  <% else %>
    <%= link_to "Download", @file_path %>
  <% end %>
<% else %>
  <p>No file uploaded.</p>
<% end %>