侧边栏链接

app/Http/Controllers/CategoriesController.php

@@ -6,20 +6,22 @@
 use App\Models\Topic;
 use App\Models\Category;
 use App\Models\User;
+use App\Models\Link;
 
 class CategoriesController extends Controller
 {
-    public function show(Category $category, Request $request, Topic $topic, User $user)
+    public function show(Category $category, Request $request, Topic $topic, User $user, Link $link)
     {
         // 读取分类 ID 关联的话题，并按每 20 条分页
         $topics = $topic->withOrder($request->order)
                         ->where('category_id', $category->id)
-                        ->with('user', 'category')   // 预加载防止 N+1 问题
+                        ->with('user',  'category')  // 预加载防止 N+1 问题
                         ->paginate(20);
         // 活跃用户列表
         $active_users = $user->getActiveUsers();
-
-        // 传参变量话题和分类到模板中
-        return view('topics.index', compact('topics', 'category', 'active_users'));
+        // 资源链接
+        $links = $link->getAllCached();
+        // 传参变量到模板中
+        return view('topics.index', compact('topics', 'category', 'active_users', 'links'));
     }
 }

app/Http/Controllers/TopicsController.php

@@ -10,6 +10,7 @@
 use Illuminate\Support\Facades\Auth;
 use App\Handlers\ImageUploadHandler;
 use App\Models\User;
+use App\Models\Link;
 
 class TopicsController extends Controller
 {
@@ -18,14 +19,15 @@ public function __construct()
         $this->middleware('auth', ['except' => ['index', 'show']]);
     }
 
-	public function index(Request $request, Topic $topic, User $user)
+	public function index(Request $request, Topic $topic, User $user, Link $link)
     {
         $topics = $topic->withOrder($request->order)
                         ->with('user', 'category')  // 预加载防止 N+1 问题
                         ->paginate(20);
         $active_users = $user->getActiveUsers();
+        $links = $link->getAllCached();
 
-        return view('topics.index', compact('topics', 'active_users'));
+        return view('topics.index', compact('topics', 'active_users', 'links'));
     }
 
     public function show(Request $request, Topic $topic)

app/Models/Link.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Support\Facades\Cache;
+
+class Link extends Model
+{
+    use HasFactory;
+
+    protected $fillable = ['title', 'link'];
+
+    public $cache_key = 'larabbs_links';
+    protected $cache_expire_in_seconds = 1440 * 60;
+
+    public function getAllCached()
+    {
+        // 尝试从缓存中取出 cache_key 对应的数据。如果能取到，便直接返回数据。
+        // 否则运行匿名函数中的代码来取出 links 表中所有的数据，返回的同时做了缓存。
+        return Cache::remember($this->cache_key, $this->cache_expire_in_seconds, function(){
+            return $this->all();
+        });
+    }
+}

app/Observers/LinkObserver.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Observers;
+
+use App\Models\Link;
+use Illuminate\Support\Facades\Cache;
+
+class LinkObserver
+{
+    // 在保存时清空 cache_key 对应的缓存
+    public function saved(Link $link)
+    {
+        Cache::forget($link->cache_key);
+    }
+}

app/Providers/AppServiceProvider.php

@@ -28,6 +28,7 @@ public function boot()
 		\App\Models\User::observe(\App\Observers\UserObserver::class);
 		\App\Models\Reply::observe(\App\Observers\ReplyObserver::class);
 		\App\Models\Topic::observe(\App\Observers\TopicObserver::class);
+        \App\Models\Link::observe(\App\Observers\LinkObserver::class);
 
         \Illuminate\Pagination\Paginator::useBootstrap();
     }

config/administrator.php

@@ -51,6 +51,7 @@
         ],
         '站点管理' => [
             'settings.site',
+            'links',
         ],
     ],
 

config/administrator/links.php

@@ -0,0 +1,52 @@
+<?php
+
+use App\Models\Link;
+use Illuminate\Support\Facades\Auth;
+
+return [
+    'title'   => '资源推荐',
+    'single'  => '资源推荐',
+
+    'model'   => Link::class,
+
+    // 访问权限判断
+    'permission'=> function()
+    {
+        // 只允许站长管理资源推荐链接
+        return Auth::user()->hasRole('Founder');
+    },
+
+    'columns' => [
+        'id' => [
+            'title' => 'ID',
+        ],
+        'title' => [
+            'title'    => '名称',
+            'sortable' => false,
+        ],
+        'link' => [
+            'title'    => '链接',
+            'sortable' => false,
+        ],
+        'operation' => [
+            'title'  => '管理',
+            'sortable' => false,
+        ],
+    ],
+    'edit_fields' => [
+        'title' => [
+            'title'    => '名称',
+        ],
+        'link' => [
+            'title'    => '链接',
+        ],
+    ],
+    'filters' => [
+        'id' => [
+            'title' => '标签 ID',
+        ],
+        'title' => [
+            'title' => '名称',
+        ],
+    ],
+];

database/factories/LinkFactory.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace Database\Factories;
+
+use Illuminate\Database\Eloquent\Factories\Factory;
+
+class LinkFactory extends Factory
+{
+    public function definition()
+    {
+        return [
+            'title' => $this->faker->name,
+            'link' => $this->faker->url,
+        ];
+    }
+}

database/migrations/2022_03_07_223007_create_links_table.php

@@ -0,0 +1,23 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up()
+    {
+        Schema::create('links', function (Blueprint $table) {
+            $table->increments('id');
+            $table->string('title')->comment('资源的描述')->index();
+            $table->string('link')->comment('资源的链接')->index();
+            $table->timestamps();
+        });
+    }
+
+    public function down()
+    {
+        Schema::dropIfExists('links');
+    }
+};

database/seeders/DatabaseSeeder.php

@@ -12,5 +12,6 @@ public function run()
         $this->call(UsersTableSeeder::class);
         $this->call(TopicsTableSeeder::class);
 		$this->call(RepliesTableSeeder::class);
+        $this->call(LinksTableSeeder::class);
     }
 }

database/seeders/LinksTableSeeder.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Database\Seeders;
+
+use Illuminate\Database\Seeder;
+use App\Models\Link;
+
+class LinksTableSeeder extends Seeder
+{
+    public function run()
+    {
+        Link::factory()->times(6)->create();
+    }
+}

resources/views/topics/_sidebar.blade.php

@@ -24,3 +24,19 @@
     </div>
   </div>
 @endif
+
+@if (count($links))
+  <div class="card mt-4">
+    <div class="card-body pt-2">
+      <div class="text-center mt-1 mb-0 text-muted">资源推荐</div>
+      <hr class="mt-2 mb-3">
+      @foreach ($links as $link)
+        <a class="d-flex mt-1 text-decoration-none" href="{{ $link->link }}">
+          <div class="media-body">
+            <span class="media-heading text-muted">{{ $link->title }}</span>
+          </div>
+        </a>
+      @endforeach
+    </div>
+  </div>
+@endif