课堂在线学习

app/models/course_stage.rb

@@ -0,0 +1,9 @@
+class CourseStage < ApplicationRecord
+  belongs_to :course, counter_cache: true
+
+  has_many :course_stage_shixuns, -> { order("course_stage_shixuns.position ASC") }, dependent: :destroy
+  has_many :shixuns, :through => :course_stage_shixuns
+
+  validates :name, length: { maximum: 60 }
+  validates :description, length: { maximum: 300 }
+end

app/models/course_stage_shixun.rb

@@ -0,0 +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
+end

db/migrate/20190910061807_create_course_stages.rb

@@ -0,0 +1,13 @@
+class CreateCourseStages < ActiveRecord::Migration[5.2]
+  def change
+    create_table :course_stages do |t|
+      t.references :course, index: true
+      t.string :name
+      t.text :description
+      t.integer :position
+      t.integer :shixuns_count
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20190910062710_create_course_stage_shixuns.rb

@@ -0,0 +1,12 @@
+class CreateCourseStageShixuns < ActiveRecord::Migration[5.2]
+  def change
+    create_table :course_stage_shixuns do |t|
+      t.references :course, index: true
+      t.references :course_stage, index: true
+      t.references :shixun, index: true
+      t.integer :position
+
+      t.timestamps
+    end
+  end
+end

spec/models/course_stage_shixun_spec.rb

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+require 'rails_helper'
+
+RSpec.describe CourseStageShixun, type: :model do
+  pending "add some examples to (or delete) #{__FILE__}"
+end

spec/models/course_stage_spec.rb

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