Direct downloading a xls file without writing it to the directory by Spreadsheet gem

问题

I am using this Spreadsheet gem to export xls file.

I have the following codes in my controller:

def export
  @data = Data.all

  book = Spreadsheet::Workbook.new
  sheet = book.create_worksheet :name => "data"

  contruct_body(sheet, @data)

  book.write "data.xls"
end

In this way, I can fill in the data and save it in the root directory.

But I want to download it instead of save it. How could I modify the code so that the user prompted to select his local directory to save the file? (better if without saving a copy in the server side)

Please help!

回答1:

You can send it to the browser without saving it as a local file at all as follows

spreadsheet = StringIO.new 
book.write spreadsheet 
send_data spreadsheet.string, :filename => "yourfile.xls", :type =>  "application/vnd.ms-excel"

回答2:

You could try this code

book.write "data.xls"

send_file "/path/to/data.xls", :type => "application/vnd.ms-excel", :filename => "data.xls", :stream => false

# and then delete the file

File.delete("path/to/data.xls")

Passing :stream => false to send_file will instruct Rails to copy the entire file into memory before streaming, so using File.delete immediately after send_file would be fine since send_file returns immediately without waiting for the download to complete. Having said that, with very large files you may see some memory bottle necks depending on the amount of memory available.

HTH

回答3:

The case happen on mybody. I used the ajax request by remote::true to export excel file, nothing display on browser without any error message on console. Delete the remote params from the form, it works well.

来源：https://stackoverflow.com/questions/4049939/direct-downloading-a-xls-file-without-writing-it-to-the-directory-by-spreadsheet