在线学习

app/controllers/courses_controller.rb

@@ -166,6 +166,8 @@ class CoursesController < ApplicationController
             end
 
             Inform.create(container: @course, description: @subject.learning_notes, name: "学习须知")
+
+            @course.create_stages @course.subject
           end
 
           course_module_types = params[:course_module_types]

app/models/course.rb

@@ -333,6 +333,17 @@ class Course < ApplicationRecord
     teacher_power_courses
   end
 
+  def create_stages subject
+    if subject
+      subject.stages.each do |stage|
+        new_stage = CourseStage.create!(course_id: id, name: stage.name, description: stage.description, position: stage.position)
+        stage.stage_shixuns.each do |stage_shixun|
+          CourseStageShixun.create!(course_id: id, course_stage_id: new_stage.id, shixun_id: stage_shixun.shixun_id, position: stage_shixun.position)
+        end
+      end
+    end
+  end
+
   private
 
   #创建课程后，给该用户发送消息

app/models/course_stage.rb

@@ -1,5 +1,5 @@
 class CourseStage < ApplicationRecord
-  belongs_to :course, counter_cache: true
+  belongs_to :course
 
   has_many :course_stage_shixuns, -> { order("course_stage_shixuns.position ASC") }, dependent: :destroy
   has_many :shixuns, :through => :course_stage_shixuns

app/models/course_stage_shixun.rb

@@ -1,5 +1,5 @@
 class CourseStageShixun < ApplicationRecord
-  belongs_to :course, counter_cache: :stages_count, counter_cache: :shixuns_count
-  belongs_to :course_stage
-  belongs_to :shixun, counter_cache: :shixuns_count
+  belongs_to :course
+  belongs_to :course_stage, counter_cache: :shixuns_count
+  belongs_to :shixun
 end

db/migrate/20190910063345_migrate_course_stages.rb

@@ -0,0 +1,14 @@
+class MigrateCourseStages < ActiveRecord::Migration[5.2]
+  def change
+    Course.where(excellent: 1).each do |course|
+      if course.subject
+        course.subject.stages.each do |stage|
+          new_stage = CourseStage.create!(course_id: course.id, name: stage.name, description: stage.description, position: stage.position)
+          stage.stage_shixuns.each do |stage_shixun|
+            CourseStageShixun.create!(course_id: course.id, course_stage_id: new_stage.id, shixun_id: stage_shixun.shixun_id, position: stage_shixun.position)
+          end
+        end
+      end
+    end
+  end
+end