json.students do
  json.array! @students do |student|
    json.user_id student.user_id
    json.login student.user.try(:login)
    json.name student.user.try(:real_name)
    json.name_link user_path(student.user)
    json.student_id student.user.try(:student_id)
    json.course_group_name student.course_group.try(:name)
    json.course_member_id student.id
  end
end
json.students_count @students_count
if @course_group.present?
  json.course_group_name @course_group.name
  json.invite_code @course_group.invite_code
end