Laravel, get relation row instead of id - laravel

Question

I want to get author row instead of author_id. I could this with add collection and change one by one but has Laravel any function for this? Well, I want make this one line
Can i use something like this
Book::where('id',$bid)->with('author')->first('author_id AS author'); //Changes only coulmn name :(
model
public function author()
{
return $this->hasOne(Author::class,'id','author_id');
}
query
Book::where('id',$bid)->with('author')->first()
Output
{
"id": 1,
"name": "Book 1",
"author_id": 3,
"category_id": 2,
"level_id": 1,
"book_language_id": 1,
"book_length": 0,
"img": "book1.png",
"summary": "Summary 1",
"rate_avg": "2.75",
"created_at": "2022-03-04T18:46:32.000000Z",
"updated_at": "2022-03-04T18:52:28.000000Z",
"author": {
"id": 3,
"name": "Author 3",
"created_at": "2022-03-04T18:46:32.000000Z",
"updated_at": "2022-03-04T18:46:32.000000Z"
}
}
Want
{
"id": 1,
"name": "Book 1",
"author": {
"id": 3,
"name": "Author 3",
"created_at": "2022-03-04T18:46:32.000000Z",
"updated_at": "2022-03-04T18:46:32.000000Z"
},
"category_id": 2,
"level_id": 1,
"book_language_id": 1,
"book_length": 0,
"img": "book1.png",
"summary": "Summary 1",
"rate_avg": "2.75",
"created_at": "2022-03-04T18:46:32.000000Z",
"updated_at": "2022-03-04T18:52:28.000000Z",
}

Answer 1

in your query
Book::where('id',$bid)->with('author')->first()
you are getting the book that has that id and you are eager loading the author relation, so in order to get the author you have to access the author field:
Book::where('id',$bid)->with('author')->first()->author

Answer 2

As I said I can this with collection like this:
$b=Book::where('id',$bid)->with('author')->first();
$book=collect([
'id'=>$b->id,
'name'=>$b->name,
'author'=>$b->author,
'category_id'=>$b->category_id,
'level_id'=>$b->level_id,
'book_language_id'=>$b->book_language_id,
'book_length'=>$b->book_length,
'summary'=>$b->summary,
'rate_avg'=>$b->rate_avg,
]);
But this method seems unnecessary

Answer 3

In your example the only difference between the output and what you want is "author_id": 3, as been deleted.
So if you don't want a column or rename a column, you need to use ->select and take all the field you want. And you can also rename with something like that
-> select(DB::raw('author_id as auhtor'), 'books.*')