extract_value_from_default

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 486
        def extract_value_from_default(default)
          case default
          when /^null$/
            nil
          # Quoted types
          when /^'([^|]*)'$/
            $1.gsub("''", "'")
          # Quoted types
          when /^"([^|]*)"$/
            $1.gsub('""', '"')
          # Numeric types
          when /\A-?\d+(\.\d*)?\z/
            $&
          # Binary columns
          when /x'(.*)'/
            [ $1 ].pack("H*")
          else
            # Anything else is blank or some function
            # and we can't know the value of that, so return nil.
            nil
          end
        end