Converting .txt file to .xml ruby on rails - ruby-on-rails

Question

I have a custom file type (.map) that I am unzipping from a Gzip file and then writing to a new file in order to pass it along to Paperclip and upload to s3. My problem is that the type should be an xml, while it is saving as a text document instead with all xml formatting correct. I need a way to convert it into the xml type and then save that as a new File object before passing it along.
Here is my code so far:
Zlib::GzipReader.open(f.tempfile) do |gz|
puts gz.orig_name
#tmp = File.new(gz.orig_name, "w+")
while chunk = gz.read(16*1024) do
#tmp.write(chunk)
end
end
reader = #tmp.read
s = location.posts.create!(
subject: #email.subject,
from: #email.from[:email],
mapfile: #tmp)
}
ideally i will be passing mapfile the xml type file, but right now it seems to be text
Update:
So now I have set my post.rb to do this, and added a name attribute to post containing the original file name:
has_attached_file :mapfile,
:preserve_files => "true",
:path =>
':rails_root/non-public/system/:id/:basename.:extension',
:url => '/:class/:id/mapfiles',
:s3_headers => lambda { |attachment| {'Content-Disposition' => "attachment; filename = #{attachment.name}"}}
And this works perfectly!

Answer 1

It sounds like you are talking about `Content-Type'. When you save a file to the filesystem, you can't set this: the system will decide what to use based on the file extension and possibly by analysing the contents, if it's a text file.
However, you can set the content type when you serve a file to someone's browser, and when you upload it to S3. See here for the latter Setting the Content-Type in direct to S3 upload using Rails and jQuery File Upload