primary_keys

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 317
      def primary_keys(table_name) # :nodoc:
        pks = table_structure(table_name).select { |f| f["pk"] > 0 }
        pks.sort_by { |f| f["pk"] }.map { |f| f["name"] }
      end