调整

app/controllers/courses_controller.rb

@@ -166,6 +166,8 @@ class CoursesController < ApplicationController
               CourseMember.create!(course_id: @course.id, user_id: s_member.user_id, role: 2)
             end
 
+            CreateSubjectCourseStudentJob.perform_later(@course.id) if course.subject.subject_appointments.count > 0
+
             Inform.create(container: @course, description: @subject.learning_notes, name: "学习须知")
 
             @course.create_stages @course.subject

app/jobs/create_subject_course_student_job.rb

@@ -0,0 +1,20 @@
+class CreateSubjectCourseStudentJob < ApplicationJob
+  queue_as :default
+
+  def perform(course_id)
+    course = Course.find_by(id: course_id)
+    return if course.blank? || course.subject.blank?
+
+    attrs = %i[course_id user_id role created_at updated_at]
+    same_attrs = {course_id: course.id, role: 4}
+
+    CourseMember.bulk_insert(*attrs) do |worker|
+      course.subject.subject_appointments.each do |app|
+        next if course.students.where(user_id: user_id).any?
+        worker.add same_attrs.merge(user_id: app.user_id)
+      end
+    end
+
+    course.subject.subject_appointments.destroy_all
+  end
+end

spec/jobs/create_subject_course_student_job_spec.rb

@@ -0,0 +1,5 @@
+require 'rails_helper'
+
+RSpec.describe CreateSubjectCourseStudentJob, type: :job do
+  pending "add some examples to (or delete) #{__FILE__}"
+end