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
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 =

I imagine with roo would be something like

In this example the model MyFile has_attached_file :attachment

@workbook =

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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