Laravel 5.5: Getting id after insert - php

Question

I have a model hotel.php to insert hotel data.insert data using create() but it dosen't return id, the returning collection hasn't id field!
Controller.php
/** "/user/2/create" */
public function store(User $user, HotelRequest $request)
{
$slug = (new hotel)->uniqueSlug( $request->name );
$request->merge([
'cat_id' => 1,
'slug' => $slug,
'created_by' => auth()->user()->id,
]);
$hotel = $user->hotels()->create( $request->all() );
dd($hotel);
................
hotel.php (model)
namespace App;
use Illuminate\Http\UploadedFile;
use Illuminate\Database\Eloquent\Model;
class hotel extends Model
{
protected $fillable = ['name', 'description','address','street','city','email',
'phone','web','cat_id','slug','created_by'];
protected $primaryKey = 'slug';
/**
unique slugs genarating
*/
protected $slug_guards = ['create','room'];
public $incrementing = false;
User.php (model)
public function hotels( )
{
return $this->hasmany('App\Hotel');
}
and the final result
It dosen't have id attribute. I need id to upload image!
NB: I changed that primarykey to default 'id' but no change in result.
Create_hotels... migration
public function up()
{
Schema::create('hotels', function (Blueprint $table) {
$table->increments('id');
$table->integer('user_id')->unsigned()->index();
$table->integer('created_by');
$table->integer('cat_id');
$table->string('name');

Answer 1

Your hotel model set the primary key as the slug :
protected $primaryKey = 'slug';
What i usually do, is for all my migrations, i set an autoincrements like following :
$table->increments('id');
this way laravel handles everything for you. Each create, update or whatever method handle the id of your items.
With this, you can then return the id of a stored data this way :
$id = create($data)->id;
where $data is your model with new datas. $id should now contain the id value of the newest stored model datas.

Answer 2

You have to change the Hotel model (or remove the whole line):
public $incrementing = true;

Answer 3

You are dumping the data you just inserted into the db which does not contain a id field.
create a show method in your Controller class as follows
public function show(User $user){
dd($user)
}
with a route as follows:
Route::get('user/{user}', 'Controller#show')

Answer 4

In hotel.php before the protected $fillable declaration try adding
protected $guarded = [
'id',
];
In your controllers store() method just after $slug = (new hotel)->uniqueSlug( $request->name );
try adding a $slug->save(); then returned slug should have an ID returned with it.
and/or possible the same similar strategy after line
$hotel = $user->hotels()->create( $request->all() );
by adding $hotel->save();

Answer 5

I changed the primarykey to default id and $incrementing = true; now its returning id of the created data. I changed whole methodes in Controller