find

# File activerecord/lib/active_record/associations/association_collection.rb, line 24
      def find(*args)
        options = args.extract_options!

        # If using a custom finder_sql, scan the entire collection.
        if @reflection.options[:finder_sql]
          expects_array = args.first.kind_of?(Array)
          ids           = args.flatten.compact.uniq.map { |arg| arg.to_i }

          if ids.size == 1
            id = ids.first
            record = load_target.detect { |r| id == r.id }
            expects_array ? [ record ] : record
          else
            load_target.select { |r| ids.include?(r.id) }
          end
        else
          conditions = "#{@finder_sql}"
          if sanitized_conditions = sanitize_sql(options[:conditions])
            conditions << " AND (#{sanitized_conditions})"
          end
          
          options[:conditions] = conditions

          if options[:order] && @reflection.options[:order]
            options[:order] = "#{options[:order]}, #{@reflection.options[:order]}"
          elsif @reflection.options[:order]
            options[:order] = @reflection.options[:order]
          end
          
          # Build options specific to association
          construct_find_options!(options)
          
          merge_options_from_reflection!(options)
          
          # Pass through args exactly as we received them.
          args << options
          @reflection.klass.find(*args)
        end
      end