prawn PDF: I need to generate nested tables

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I need a table where rows are actually 2 rows tables, a nested table that is.. How can I do that in prawn? Maybe I need an extension.. but which one?

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Subtables are now supported:

Prawn::Document.generate("subtable.pdf") do |pdf|
  subtable = pdf.make_table([["sub"], ["table"]])
  pdf.table([[subtable, "original"]])
end

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No support for this exists in released versions, but in the master branch of http://github.com/sandal/prawn you'll find our revamped table support which has nested tables. Take a look at the examples/ dir.

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Table nesting was actually the major inspiration for Crayfish.
As far as I know Prawn still can't do proper sizing and cell placements on more sophisticated tables.