Call to undefined method Admin\Models\Inventory::settings()

 $orderItems = $orderItemQuery
 ->with([
 'saleItem.inventory.source.company',
 'saleItem.inventory.source.settings',
 'saleItem.inventory.source.stream',
 'saleItem.pricing',
 'saleItem.item'])
 ->latest()
 ->paginate($count);

class OrderItem extends Model {
 public function saleItem()
 {
 return $this->belongsTo(SaleItem::class);
 }
}
class SaleItem {
 public function inventory()
 {
 return $this->belongsTo(Inventory::class);
 }
}
class Inventory extends Model {
 public function company()
 {
 return $this->belongsTo(Company::class);
 }
 public function source()
 {
 return $this->morphTo('source', 'entity_type', 'entity_id');
 }
}
class Event extends Model {
 public function inventory(): MorphOne
 {
 return $this->morphOne(Inventory::class, 'inventory', 'entity_type', 'entity_id');
 }
 public function company()
 {
 return $this->belongsTo(Company::class);
 }
 public function settings()
 {
 return $this->hasOne(EventSetting::class)->withDefault();
 }
 public function stream()
 {
 return $this->hasOne(EventStream::class)->withDefault();
 }
}