Rails - Oct 2013 - How do I tell roo to open a paperclip attachment after uploaded to later processing?

Hello, I''m new to ruby and rails... I was planning to use the
spreadsheet
gem to open the files but it doesn''t support xlsx.
I saw this as an example on how to do the same using paperclip

@workbook = Spreadsheet.open(MyFile.first.attachment.to_file)

I imagine with roo would be something like

# In this example the model MyFile has_attached_file :attachment

@workbook =  Roo::Excelx.new(MyFile.first.attachment.to_file)

**Like I said I''m new to Ruby and Rails, so I don''t know
what''s "first", I assume it refers to the first record (the
lastest) on the MyFile corresponding Table**

Is this the right way to do it? I find the use of "new" confusing,
although it says  loads an Excel Spreadsheet for Excel .xlsx files I think
it''s creating a new one instead of loading the attachment. Thank you
for your guidance in advance.

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