调整

app/controllers/courses_controller.rb

@@ -96,7 +96,7 @@ class CoursesController < ApplicationController
     limit = params[:limit] || 16
 
     @courses = @courses.page(page).per(limit)
-    @courses = @courses.preload(:school, :course_members, teacher: :user_extension)
+    @courses = @courses.preload(:school, teacher: :user_extension)
   end
 
   def visits_plus_one

app/models/user.rb

@@ -323,12 +323,7 @@ class User < ApplicationRecord
     elsif business?
       Course::BUSINESS
     else
-      role =
+      role = course.course_members.find_by(user_id: id, is_active: 1)&.role
-        if course.course_members.loaded?
-          course.course_members.find{|member| member.user_id == id && member.is_active == 1}&.role
-        else
-          course.course_members.find_by(user_id: id, is_active: 1)&.role
-        end
       case role
       when nil                   then Course::NORMAL
       when 'CREATOR'             then Course::CREATOR