json.tags @tags do |tag|
  json.tag_id tag.id
  json.tag_name tag.name
end

json.shixun_list do
  json.partial! 'shixuns/choose_shixun', locals: {shixuns: @shixuns}
end

json.shixuns_count @shixuns_count

json.partial! 'homework_commons/second_category', locals: {main_catrgory: @main_catrgory, homework_category: @homework_category}