资源的父目录需统计子目录个数

app/helpers/courses_helper.rb

@@ -251,7 +251,13 @@ module CoursesHelper
   # 获取课堂的资源数
   def get_attachment_count(course, category_id)
     identity = current_user.course_identity(course)
-    attachments = category_id.to_i == 0 ? course.attachments : course.attachments.where(course_second_category_id: category_id)
+    if category_id.to_i == 0
+      attachments = course.attachments
+    else
+      # children_ids = CourseSecondCategory.where(parent_id: category_id).pluck(:id)
+      # category_ids = [category_id] + children_ids
+      attachments = course.attachments.joins(:course_second_category).where(course_second_categories: {id: category_id}).or(course.attachments.joins(:course_second_category).where(course_second_categories: {parent_id: category_id}))
+    end
     identity > Course::ASSISTANT_PROFESSOR ? attachments.published.size : attachments.size
   end