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used flat_map instead of map.flatten in /guides/rails_guides/helpers.rb
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@ -17,7 +17,7 @@ module RailsGuides
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end
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def documents_flat
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documents_by_section.map {|section| section['documents']}.flatten
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documents_by_section.flat_map {|section| section['documents']}
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end
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def finished_documents(documents)
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