How to merge table query results using Laravel Eloquent?

Question

Laravel

Good day!
Please tell me about laravel Eloquent.
By executing the following code:

$cat = Category::with('posts:id,title','pages:id,title')->findOrFail($id);
return $cat;

I get the following result:

{
  "id": 1,
  "name": "Категория 1",
  "slug": "cat1",
  "parent_id": 0,
  "posts": [
    {
      "id": 1,
      "title": "Запись №1",
      "pivot": {
        "category_id": 1,
        "categoriable_id": 1,
        "categoriable_type": "App\\Post"
      }
    }
  ],
  "pages": [
    {
      "id": 1,
      "title": "Страница №1",
      "pivot": {
        "category_id": 1,
        "categoriable_id": 1,
        "categoriable_type": "App\\Page"
      }
    }
  ]
}

The question is: how to combine the posts and pages arrays to get something like this:

{
  "id": 1,
  "name": "Категория 1",
  "slug": "cat1",
  "parent_id": 0,
  "posts_and_pages": [
    {
      "id": 1,
      "title": "Запись №1",
      "pivot": {
        "category_id": 1,
        "categoriable_id": 1,
        "categoriable_type": "App\\Post"
      }
    },
    {
      "id": 1,
      "title": "Страница №1",
      "pivot": {
        "category_id": 1,
        "categoriable_id": 1,
        "categoriable_type": "App\\Page"
      }
    }
  ]
}

Answer 1

concat what you need