query_attribute

# File activerecord/lib/active_record/attribute_methods/query.rb, line 10
      def query_attribute(attr_name)
        value = read_attribute(attr_name) { |n| missing_attribute(n, caller) }

        case value
        when true        then true
        when false, nil  then false
        else
          column = self.class.columns_hash[attr_name]
          if column.nil?
            if Numeric === value || value !~ /[^0-9]/
              !value.to_i.zero?
            else
              return false if ActiveRecord::ConnectionAdapters::Column::FALSE_VALUES.include?(value)
              !value.blank?
            end
          elsif column.number?
            !value.zero?
          else
            !value.blank?
          end
        end
      end