json.data do
  json.array! @videos.each do |d|
    json.watch_course_video_id d['watch_course_video_id']
    json.title d.title
    json.user_name d.video.user&.real_name
    json.is_finished d.is_finished == 1 ? true : false
    json.total_duration d.total_duration.round(0)
    json.freq d['freq']
    json.start_at d.start_at.to_s
    json.end_at d.end_at.to_s
  end
end

json.count @count