如何使用send_file下载文件？

Question

有人可以告诉我如何下载文件吗 send_file?

我有一个文件 image.jpg 里面 app/assets/images. 。我在我的控制器中尝试过：

def download
    send_file ("#{Rails.root}/public/images/image.jpg")
end

def download
    send_file ("#{Rails.root}/assets/images/image.jpg")
end

def download
    send_file ("#{Rails.root}/images/image.jpg")
end

def download
    send_file ("/public/images/image.jpg")
end

def download
    send_file ("/assets/public/images/image.jpg")
end

def download
    send_file ("/assets/images/image.jpg")
end

对于每条路径，它都说：

ActionController::MissingFile in HomeController#download
Cannot read file 'some_path'

这里可能有什么问题？谢谢！

Answer 1

尝试：

IMAGES_PATH = File.join(Rails.root, "public", "images")

def download
  send_file(File.join(IMAGES_PATH, "image.jpg"))
end

Answer 2

In your view =>
<%= link_to "click here to download", signed_feeds_pdf_path(:feed_image_path => feed_image.feedimage.path), target: '_self' %>

In your controller =>
   def pdf
     file_name = params[:feed_image_path].split('/').last
     @filename ="#{Rails.root}/public/uploads/feed_image/feedimage/#{file_name}"
     send_file(@filename ,
      :type => 'application/pdf/docx/html/htm/doc',
      :disposition => 'attachment')           
  end
soo simple......

Answer 3

好吧，我建议您将文件移至公用文件夹。不管怎样，就这样做

send_file(Rails.root.join('app' , 'assets', 'images', 'image.jpg'))

Answer 4

我们需要指定矿井类型以便它能够缓存。

send_file ("#{Rails.root}/public"+image.image_path), :type => "image/jpeg", :disposition => 'inline'

Answer 5

对于仍在寻找答案的人来说，send_data 和 send_file 在响应 ajax 调用时将不起作用。相反，请尝试提交表单或使用 <a href=..> 调用控制器方法并下载文件。