修复课程首页SQL不正确的BUG

app/helpers/welcome_helper.rb

@@ -249,7 +249,7 @@ module WelcomeHelper
             reorder("COUNT(members.course_id) DESC").limit(limit).all
     :
         courses = Course.includes(:school, :members).visible.
-            joins(:course_status).
+            joins(:memberships).
             where("courses.time = ? and courses.term = ? and courses.school_id <>  ?",year_now, course_term, school_id).
             group('members.course_id').
             reorder("COUNT(members.course_id) DESC").limit(limit).all