调整

app/controllers/files_controller.rb

@@ -24,6 +24,7 @@ class FilesController < ApplicationController
 
     get_category(@course, @course_second_category_id)
     @total_count = @attachments.size
+    @unlink_count = @attachments.no_link.size
 
     if @user.course_identity(@course) == 5
       member = @course.course_members.find_by(user_id: current_user.id, is_active: 1)

app/views/files/index.json.jbuilder

@@ -5,6 +5,7 @@ json.data do
   json.total_count @total_count
   json.publish_count @publish_count
   json.unpublish_count @unpublish_count
+  json.unlink_count @unlink_count
   json.course_is_public @course.is_public?
   json.files do
     json.array! @attachments do |attachment|