BadMethodCallException: Call to undefined method Illuminate\Database\Query\Builder::createTickets() - laravel-5

Question

I am working on Order-Ticket functionality. Many tickets should ideally be generated for a single order.
Earlier, the responsibility of creating tickets was written inside Order Model and that time it worked fine but now that I am trying to move that responsibility to Ticket model itself, it is not working.
I'll start with the Test file 'TicketTest.php'
<?php
use Illuminate\Foundation\Testing\WithoutMiddleware;
use Illuminate\Foundation\Testing\DatabaseMigrations;
use Illuminate\Foundation\Testing\DatabaseTransactions;
use App\Concert;
use Carbon\Carbon;
use App\Order;
class TicketTest extends TestCase
{
use DatabaseMigrations;
/** #test */
function can_create_multiple_tickets_for_order(){
$numberOfTickets = 2;
// Arrange - Create Concert and Order
$concert = factory(Concert::class)->create(
[
'date' => Carbon::parse('December 1, 2016 8:00pm'),
]
);
$order = $concert->orders()->create([
'email' => 'abc#gmail.com'
]);
// Act - Create Tickets
$order->tickets()->createTickets($numberOfTickets); // This line throws call to undefined method.
// Assert
$this->assertEquals($numberOfTickets, $order->tickets()->count());
}
}
'Order.php' Model
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Order extends Model
{
protected $guarded = [];
public function tickets()
{
return $this->hasMany(Ticket::class);
}
}
'Ticket.php' Model
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Ticket extends Model
{
public function createTickets($ticketQuantity){
foreach(range(1, $ticketQuantity) as $i) {
$this->create([]);
}
}
public function order(){
return $this->belongsTo(Order::class);
}
}

Answer 1

Before Laravel 5.4, I solved this problem by creating a new Relation and using that relation to Map Order to Ticket. Created a file 'app/Relation/TicketOrderRelation.php' and added following code in it
<?php
namespace App\Relation;
use Illuminate\Database\Eloquent\Relations\HasMany;
class TicketOrderRelation extends HasMany {
/**
* Create a Collection of new tickets
*
* #param int $ticketQuantity Number of Tickets to be created
* #return \Illuminate\Database\Eloquent\Collection
*/
public function createTickets($ticketQuantity){
$instances = [];
foreach(range(1, $ticketQuantity) as $i) {
$instances[] = $this->create([]);
}
return collect($instances);
}
}
New 'Order.php' file
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
use App\Relation\TicketOrderRelation;
class Order extends Model
{
protected $guarded = [];
/**
* Define a one-to-many relationship. One Order can have many tickets.
*
* This method is duplicate of hasMany method. The only difference is it
* returns object of TicketOrderRelation class at the bottom instead of
* object of HasMany class.
*
* #param string $related
* #param string $foreignKey
* #param string $localKey
* #return \App\Relation\TicketOrderRelation
*/
public function ticketOrderRelation($related, $foreignKey = null, $localKey = null)
{
$foreignKey = $foreignKey ?: $this->getForeignKey();
$instance = new $related;
$localKey = $localKey ?: $this->getKeyName();
return new TicketOrderRelation($instance->newQuery(), $this, $instance->getTable().'.'.$foreignKey, $localKey);
}
public function tickets()
{
return $this->ticketOrderRelation(Ticket::class);
}
}
New 'Ticket.php' file
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Ticket extends Model
{
protected $guarded = [];
public function order()
{
return $this->belongsTo(Order::class);
}
}
After Laravel 5.4, Eloquent builder started supporting create method which makes creation easy.
This answer shows how to create a custom Builder. I have not yet tried if custom builder solves this problem on Laravel 5.4 or not but if it does, then I would prefer that.