Laravel 获取所有类别的帖子数

Question

嗨，我正在尝试让数组包含所有类别的数量 每个类别的帖子：例如：

[
{id: 1, name: "category1", posts: 15 },
{id: 2, name: "category2", posts: 33 },
{id: 3, name: "category3", posts: 27 }
]

详情：

• 帖子表

public function up()
{
    Schema::create('posts', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->bigInteger('user_id')->unsigned();
        $table->foreign('user_id')->references('id')->on('users');
        $table->string('slug')->unique();
        $table->string('title');
        $table->string('image');
        $table->text('description');
        $table->integer('category_id')->unsigned();;
        $table->longText('content');
        $table->boolean('published')->default(0);
        $table->timestamps();
    });
}

• 类别表

public function up()
{
    Schema::create('categories', function (Blueprint $table) {
        $table->increments('id');
        $table->string('name')->unique();
        $table->timestamps();
    });
}

• 帖子模型

public function category()
{
  return $this->belongsTo('App\Models\Category');
}

• 类别模型

public function posts()
{
  return $this->hasMany('App\Models\Post');
}

• 类别控制器

public function index()
{
  $Categories  = Category::with('posts')->get();
  return response()->json($Categories);
}

但是这个函数返回所有提交的帖子，是一种计算它们并将数字作为参数添加到数组中的方法吗？

Answer 1

您可以使用withCount

$categories = Category::withCount('posts')->get(); 

然后您可以循环访问 $categories 并访问

$category->posts_count 

每个类别。