module ProtoCool
  module ValuesOf
    def values_of(colspec, options = {}, &block)
      ar_column = nil

      case colspec
      when Symbol
        select_string = "#{table_name}.#{connection.quote_column_name(colspec)}"
        ar_column = columns_hash[colspec.to_s]
      when String
        select_string = colspec
      else
        raise ArgumentError, "I don't know how to process a select of: #{colspec.inspect}"
      end
      
      raw_values = connection.select_values(construct_finder_sql(options.merge(:select => select_string)), 'values_of')
      
      return raw_values.collect(&block) unless block.nil?
      return raw_values.collect {|v| ar_column.type_cast(v) } unless ar_column.nil?
      raw_values
    end
  end
end