Newsモデルとマイグレーション、テストファイルを追加

- title:string、url:string、published_at:datetime の Newsモデルを生成
- url カラムにユニークインデックスを追加し重複登録を防止
- spec/models/news_spec.rb にモデルスペック用ファイルを作成
- spec/factories/news.rb に FactoryBot ファクトリを追加

Author: nacchan99

app/models/news.rb

@@ -0,0 +1,2 @@
+class News < ApplicationRecord
+end

db/migrate/20250630040611_create_news.rb

@@ -0,0 +1,13 @@
+class CreateNews < ActiveRecord::Migration[8.0]
+  def change
+    create_table :news do |t|
+      t.string   :title
+      t.string   :url
+      t.datetime :published_at
+
+      t.timestamps
+    end
+
+    add_index :news, :url, unique: true
+  end
+end

db/schema.rb

@@ -10,10 +10,10 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.1].define(version: 2025_05_20_091834) do
+ActiveRecord::Schema[8.0].define(version: 2025_06_30_040611) do
   # These are extensions that must be enabled in order to support this database
+  enable_extension "pg_catalog.plpgsql"
   enable_extension "pg_stat_statements"
-  enable_extension "plpgsql"
 
   create_table "dojo_event_services", id: :serial, force: :cascade do |t|
     t.integer "dojo_id", null: false
@@ -58,6 +58,15 @@
     t.index ["service_name", "event_id"], name: "index_event_histories_on_service_name_and_event_id", unique: true
   end
 
+  create_table "news", force: :cascade do |t|
+    t.string "title"
+    t.string "url"
+    t.datetime "published_at"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["url"], name: "index_news_on_url", unique: true
+  end
+
   create_table "podcasts", force: :cascade do |t|
     t.string "enclosure_url", null: false
     t.string "title", null: false

spec/factories/news.rb

@@ -0,0 +1,7 @@
+FactoryBot.define do
+  factory :news do
+    title { "MyString" }
+    url { "MyString" }
+    published_at { "2025-06-30 13:06:11" }
+  end
+end

spec/models/news_spec.rb

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