[Rails] 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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