module Weapps::AttendancesHelper

  def student_attendance_status attendance, user
    st_attendance = attendance.course_member_attendances.find_by(user_id: user.id)
    st_attendance.present? ? st_attendance.attendance_status : "ABSENCE"
  end

  def group_attendance_count attendances, member_ids
    # course_member_ids = group.course_members.pluck(:id)
    attendances.select{|attendance| member_ids.include?(attendance.course_member_id) && attendance.attendance_status == "NORMAL"}.size
  end

  def history_member_count member_attendances, status, attendance_id
    member_attendances.select{|member_attendance| member_attendance.attendance_status == status && member_attendance.course_attendance_id == attendance_id}.size
  end

  def cal_rate base, sum
    sum == 0 ? 0 : (base.to_f / sum)
  end
end