belongsTo(Booking::class); } public function invoiceDetails() { return $this->hasMany(InvoiceDetails::class); } public function invoiceStatuses() { return $this->hasMany(InvoiceStatuses::class); } public static function boot() { parent::boot(); self::deleting(function($invoice) { $invoice->invoiceDetails()->each(function($invoiceDetails) { $invoiceDetails->delete(); }); $invoice->invoiceStatuses()->each(function($invoiceStatuses) { $invoiceStatuses->delete(); }); }); } }