题库的多态

app/controllers/tag_disciplines_controller.rb

@@ -2,6 +2,8 @@ class TagDisciplinesController < ApplicationController
   before_action :require_login
 
   def create
-
+    sub_discipline = SubDiscipline.find_by!(id: params[:sub_discipline_id])
+    tag_discipline = TagDiscipline.create!(name: params[:name].to_s.strip, sub_discipline: sub_discipline, user_id: current_user.id)
+    render_ok({tag_discipline_id: tag_discipline.id})
   end
 end

app/models/tag_discipline.rb

@@ -1,8 +1,10 @@
 class TagDiscipline < ApplicationRecord
   belongs_to :sub_discipline
-  belongs_to :user
+  belongs_to :user, optional: true
   has_many :tag_discipline_containers, dependent: :destroy
 
+  validates_presence_of :name
+
   def discipline
     sub_discipline&.discipline
   end

config/routes.rb

@@ -56,6 +56,7 @@ Rails.application.routes.draw do
     end
 
     resources :disciplines, only: [:index]
+    resources :tag_disciplines, only: [:create]
 
     resources :item_banks do
       member do

db/migrate/20200102020737_migrate_item_type.rb

@@ -0,0 +1,6 @@
+class MigrateItemType < ActiveRecord::Migration[5.2]
+  def change
+    add_column :item_banks, :container_id, :integer
+    add_column :item_banks, :container_type, :string
+  end
+end