Laravel One to One relation error don't know why? - php

Question

Error Showing
Symfony\Component\HttpFoundation\Response::setContent(): Argument #1 ($content) must be of type ?string, Illuminate\Database\Eloquent\Relations\HasOne given, called in G:\Laravel\practice-1\vendor\laravel\framework\src\Illuminate\Http\Response.php on line 72
User Model
<?php
namespace App\Models;
use Illuminate\Contracts\Auth\MustVerifyEmail;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Illuminate\Notifications\Notifiable;
use Laravel\Sanctum\HasApiTokens;
class User extends Authenticatable
{
use HasApiTokens, HasFactory, Notifiable;
/**
* The attributes that are mass assignable.
*
* #var array<int, string>
*/
protected $fillable = [
'name',
'email',
'password',
];
/**
* The attributes that should be hidden for serialization.
*
* #var array<int, string>
*/
protected $hidden = [
'password',
'remember_token',
];
/**
* The attributes that should be cast.
*
* #var array<string, string>
*/
protected $casts = [
'email_verified_at' => 'datetime',
];
public function book()
{
# code...
return $this->hasOne(Book::class);
}
}
Book Migration
<?php
use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;
class CreateBooksTable extends Migration
{
/**
* Run the migrations.
*
* #return void
*/
public function up()
{
Schema::create('books', function (Blueprint $table) {
$table->id();
$table->integer('user_id')->unsigned();
$table->string('title');
$table->string('abut');
$table->float('amount', 8, 2);
$table->timestamps();
});
}
/**
* Reverse the migrations.
*
* #return void
*/
public function down()
{
Schema::dropIfExists('books');
}
}
Route::get('/user/{id}/book', function ($id) {
return User::find($id)->book();
});
I have no idea why I am seeing this error. I have also looked at the documentation but no help was found.

Answer 1

Your definitions are good. But this statement:
return User::find($id)->book();
returns a Illuminate\Database\Eloquent\Relations\HasOne object.
That is no valid content for a response. Try to change it to:
return User::find($id)->book;