In Ruby on Rails, After send_file method delete the file from server

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Because you’re using send_file, Rails will pass the request along to your HTTP server (nginx, apache, etc. – See the Rails documentation on send_file regarding X-Sendfile headers). Because of this, when you try to delete the file, Rails doesn’t know that it’s still being used.

You can try using send_data instead, which will block until the data is sent, allowing your File.delete request to succeed. Keep in mind that send_data requires a data stream as its argument though, not a path, so you need to open the file first:

File.open(file_path, 'r') do |f|
  send_data f.read, type: "text/excel"
end
File.delete(file_path)

The other option would be a background job that periodically checks for temp files to delete.

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