wb = xlsx_package.workbook

wb.styles do |s|
  blue_cell = s.add_style :bg_color => "FAEBDC", :sz => 10,:height => 25,:b => true, :border => { :style => :thin, :color =>"000000" },:alignment => {wrap_text: true,:horizontal => :center,:vertical => :center}
  wb.add_worksheet(name: "课堂列表") do |sheet|
    sheet.add_row %w(ID 课堂名称 成员 资源 普通作业 分组作业 实训作业 试卷 评测次数 私有 状态 单位 创建者 创建时间 动态时间), :height => 25,:style => blue_cell

    @courses.each do |course|
      data = [
        course.id,
        course.name,
        course.course_members_count,
        get_attachment_count(course, 0),
        course.course_homework_count(1),
        course.course_homework_count(3),
        course.course_homework_count(4),
        course.exercises_count,
        course.evaluate_count,
        course.is_public == 1 ? "--" : "√",
        course.is_end ? "已结束" : "正在进行",
        course.school&.name,
        course.teacher&.real_name,
        course.created_at&.strftime('%Y-%m-%d %H:%M'),
        course.max_activity_time ? course.max_activity_time&.strftime('%Y-%m-%d %H:%M') : "--"
      ]
      sheet.add_row(data)
    end
  end
end