Could not view with composite pK CakePHP4 - cakephp

Question

In cakephp-4.x I could not access Controller's view action for composite primary key table. (http://localhost:8765/invoice-items/view/1)
Here are samples of the code created by cake bake:
InvoiceItemsTable calss in which the primary key is defined as composite.
class InvoiceItemsTable extends Table
{
/**
* Initialize method
*
* #param array $config The configuration for the Table.
* #return void
*/
public function initialize(array $config): void
{
parent::initialize($config);
$this->setTable('invoice_items');
$this->setDisplayField(['item_id', 'invoice_id', 'unit_id']);
$this->setPrimaryKey(['item_id', 'invoice_id', 'unit_id']);
$this->addBehavior('Timestamp');
$this->belongsTo('Items', [
'foreignKey' => 'item_id',
'joinType' => 'INNER',
]);
$this->belongsTo('Invoices', [
'foreignKey' => 'invoice_id',
'joinType' => 'INNER',
]);
$this->belongsTo('Units', [
'foreignKey' => 'unit_id',
'joinType' => 'INNER',
]);
}
...
InvoiceItemsController view method:
/**
* View method
*
* #param string|null $id Invoice Item id.
* #return \Cake\Http\Response|null|void Renders view
* #throws \Cake\Datasource\Exception\RecordNotFoundException When record not found.
*/
public function view($id = null)
{
$invoiceItem = $this->InvoiceItems->get($id, [
'contain' => ['Items', 'Invoices', 'Units'],
]);
$this->set(compact('invoiceItem'));
}
Finally a screen shot of invoice_items table structure from phpmyadmin:
I have tried to access the view like (http://localhost:8765/invoice-items/view/1,1,6) but I got the same error ... with primary key ['1,1,6']. I do not know how to represent the composite primary key in the URL? or what is the problem?
I use CakePHP version 4.4.2

Answer 1

Table::get() expects composite keys to be passed as arrays, eg [1, 1, 6].
Assuming you're using the fallback routes from the default app skeleton, you can pass additional arguments as path parts, eg:
/invoice-items/view/1/1/6
and accept them in your controller action like:
public function view($itemId, $invoiceId, $unitId)
and build an array from the accordingly to pass to get() as the "id":
$this->InvoiceItems->get([$itemId, $invoiceId, $unitId], /* ... */)
In case you're using custom routes with fixed parameters, add additional ones in whatever form you like, for example with dashes:
$routes
->connect(
'/invoice-items/view/{itemId}-{invoiceId}-{unitId}',
['controller' => 'InvoiceItems', 'action' => 'view']
)
->setPass(['itemId', 'invoiceId', 'unitId'])
->setPatterns([
'itemId' => '\d+',
'invoiceId' => '\d+',
'unitId' => '\d+',
]);
then your URL would look like:
/invoice-items/view/1-1-6
See also
Cookbook > Routing > Route Elements
Cookbook > Routing > Passing Parameters to Action
Cookbook > Routing > Fallbacks Method