Return Related Books in Laravel - laravel

Question

I want to return a book related to a book using the author's name
I have this function in my Controller
public function show(Book $book) {
$book = Book::where('id', '=', $book)->first();
$related = Book::whereHas('author_id', function ($q) use ($book) {
return $q->whereIn('name', $post->author->pluck('id'));
})
->where('id', '!=', $book->id) // So I won't fetch same post
->get();
return view('book')
->with($book)
->with($related);
}
This is the way my book table looks like
public function up()
{
Schema::create('books', function (Blueprint $table) {
$table->bigIncrements('id');
$table->string('name');
$table->text('about');
$table->string('image');
$table->string('image_url');
$table->string('epub_url');
$table->integer('author_id');
$table->string('publisher');
$table->year('year');
$table->boolean('recommended')->default(0);
$table->timestamps();
});
}
I have done this in my models
public function books()
{
return $this->hasMany(Book::class);
}
In Bookmodel
public function author()
{
return $this->belongsTo(Author::class);
}
I have done this, and this is not working for me, as I don't know what I am doing wrong. Thanks.

Answer 1

Once you have your $book, you can easily load other books by the same author by querying the author_id field. Just make sure to exclude the original book from the query, and you're good to go.
$relatedBooks = Book::where('author_id', $book->author_id)
->where('id', '!=', $book->id)
->get();
As a side note, you're already passing an instance of Book in your method arguments, so the first line of your code ($book = Book::where('id', '=', $book)->first();) is redundant, you can simply use $book.

Answer 2

You are querying the wrong way. what you can do is first get the book with author as given,
$book = Book::with(['author'])->where(['id' => $BOOK_ID])->first();
then you can load the similar books from the same authors as given
$similarBooks = Book::whereHas('author' => function($query) use ($book){
$query->where(['id' => $book->author->id]);
})->where('id' , '!=' , $book->id)->get();
Alternatively you can load by the author's name by replacing the relation's query.