课程搜索按时间倒序排序

app/services/courses_service.rb

@@ -40,9 +40,9 @@ class CoursesService
     end
     @courses = courses_all.visible(current_user)
     if params[:name].present?
-      @courses_all = @courses.like(params[:name])
+      @courses_all = @courses.like(params[:name]).order("created_at desc")
     else
-      @courses_all =  @courses;
+      @courses_all =  @courses.order("created_at desc");
     end
     @courses_all
     course_list = []