Excel导出无法正常工作

Question

我在我的应用中添加了CSV和Excel导出功能，但在下载文件后，它只显示此#<Axlsx::Worksheet:0x007f5d23708dc0>而不是电子表格中的必需数据。

我也分享了我用过的方法和宝石。

对于此导出，我在Module Export

下创建了一个单独的控制器和一个单独的类

require 'csv'
require 'axlsx'
# extend ActiveSupport::Concern
# include Rails.application.routes.url_helpers
module Export
  class ParseError < ::StandardError; end
  class ExportError < ::StandardError; end
  class TimesheetExport
    attr_accessor :error

    def initialize(trackers, export_to='csv')
      @trackers = trackers
      @export_to = export_to
    rescue ActiveRecord::RecordNotFound
    end

    def process
      if !@trackers
        @error = "Not Found"
        return false
      else
        case @export_to
          when "csv"
            export_csv
          when "xls"
            export_xls
          else
            raise ExportError
        end
      end
    end

    def export_csv
      columns = %w(Date Task Task_URL TimeSpent Log)
      CSV.generate do |csv|
        csv << columns
        @trackers.each do |t|
          csv << [t.created_at.to_s(:short_human_with_12hours),
                    t.task.name,
                    #project_task_url(t.task.project, t.task, host: AppConfig.app_url),
                    t.time_spent,
                    t.description ]
        end
      end
    end

    def export_xls
      package = Axlsx::Package.new
      workbook = package.workbook
      workbook.add_worksheet(name: "Timesheet") do |sheet|
        sheet.add_row ["Date", "Task Name","Time Spent","Log"]
          @trackers.each do |t|
            sheet.add_row [t.created_at.to_s(:short_human_with_12hours), 
                            t.task.name,
                            t.time_spent,
                            t.description]
        end
      end
    end

已安装的宝石 -

gem 'axlsx', '= 2.0.1'
gem 'axlsx_rails'

这就是我从导出控制器传递值的方式 -

@exporter = Export::TimesheetExport.new(user_trackers, params[:export_to])
    export_string = @exporter.process
    if export_string
      case params[:export_to]
        when "csv"
          send_data export_string,
                    type: 'text/csv; charset=iso-8859-1; header=present',
                    disposition: "attachment; filename=#{@exporter.file_name}"
        when "xls"
          send_data export_string,
                    type: 'application/xls; charset=iso-8859-1; header=present',
                    disposition: "attachment; filename=#{@exporter.file_name}"
      end
    else
      flash[:alert] = @exporter.error
      redirect_to timesheet_path