Laravel 8 - one to many relationship total count not working - php

Question

I have a Truck and Package table with One to Many relationships.
One truck has many packages and one package belongs to one truck.
I have a no_of_items column to display the total number of packages that belong to a particular truck. This is how I define it inside Truck Controller:
public function store(Request $request)
{
$request->validate([
'truck_number'=>'required|unique:trucks',
'no_of_items',
'postman_name'=>'required',
'date_of_operation'=>'required',
'status'=>'required'
]);
$trucks = new Truck([
'truck_number' => $request->get('truck_number'),
'no_of_items' => $request->get('no_of_items'),
'postman_name' => $request->get('postman_name'),
'date_of_operation' => $request->get('date_of_operation'),
'status' => $request->get('status')
]);
$trucks->save();
return redirect(TRUCK)->with('success', 'Truck Details Saved!');
}
But it doesn't display anything on the truck/index.blade.php or anywhere else. Why is that?
My Models:
class Truck extends Model
{
use HasFactory;
protected $primaryKey = 'truck_id';
protected $fillable = ['truck_number', 'no_of_items', 'postman_name', 'date_of_operation', 'status'];
public function Package()
{
return $this->hasMany(Package::class, 'truck_number');
}
}
class Package extends Model
{
use HasFactory;
protected $primaryKey = 'package_id';
protected $fillable = ['truck_number', 'package_number', 'destination', 'date_of_operation'];
public function Truck(){
return $this->belongsTo(Truck::class);
}
}
truck/index.blade.php file:
<table class="table table-striped mt-5">
<thead>
<tr>
<th>No</th>
<th>Truck Number</th>
<th>Quantity</th>
<th>Postman in Charge</th>
<th>Operation Date</th>
<th>Status</th>
<th colspan="2" class="text-center">Actions</th>
</tr>
</thead>
<tbody>
#foreach($trucks as $count => $truck)
<tr>
<td>{{++$count}}</td>
<td>{{$truck->truck_number}}</td>
<td>{{$truck->Package()->count()}}</td>
<td>{{$truck->postman_name}}</td>
<td>{{$truck->date_of_operation}}</td>
<td>{{$truck->status}}</td>
<td class="text-center">
Edit
</td>
<td class="text-center">
<form action="{{ route('truck.destroy', $truck->truck_id)}}" method="post">
#csrf
#method('DELETE')
<button class="btn btn-danger btn-block" type="submit">Delete</button>
</form>
</td>
</tr>
#endforeach
</tbody>
</table>
<div class="text-center">
<a style="margin: 19px;" href="{{ route('truck.create')}}" class="btn btn-primary bg-success">New Truck Details</a>
</div>

Answer 1

Modify your relationship this way because by default the laravel will refer to the primary id of the model which did not match on your relationship foreign keys
public function Package()
{
return $this->hasMany(Package::class, 'truck_number','truck_number');
}