Add document-wide fallback_font to a Prawn PDF

The Prawn PDF manual says that you can set a document-wide fallback font in case you are dealing with special characters (in my case, Chinese characters), that may not be included in the default font.

But it doesn’t give an exact example, so here is that example:

This code goes at the top of your Prawn PDF code, and it assumes there is a font file (in my case, fireflysung.ttf) in a directory called vendor/fonts/.

    font_families["Firefly"] = {
      :normal => { :file => "#{Rails.root}/vendor/fonts/fireflysung.ttf" }

    def fallback_fonts

You can also pass multiple font family strings into the array defined by fallback_fonts if you want multiple fallback fonts.

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