json.data do
  json.array!  @follow_ups do |d|
    json.id d.id
    json.created_at d.created_at.to_s
    json.staff d.staff.user.real_name
    json.department d.department_id.present? ? Department.find(d.department_id)&.name : ''
    json.content d.content
    json.is_latest d.id == @latest.id
  end
end

json.code 0
json.count @follow_ups.total_count