CakePHP 3 : Unknown method - cakephp

Question

I am creating a function in model to find all related services.
function in ServiceCategory.php
class ServiceCategory extends Entity
{
public function relatedServices($id)
{
return $this->find('all', [
'conditions' => [
'where' => [
'id !=' => $id
],
'limit' => 5
]
]);
}
}
And calling in ServiceCategoriesController.php
public function view($id = null)
{
$serviceCategory = $this->ServiceCategories->get($id, [
'contain' => ['Services']
]);
$relatedServices = $this->ServiceCategories->relatedServices($id);
$this->set('serviceCategory', $serviceCategory);
$this->set('relatedServices', $relatedServices);
$this->set('_serialize', ['serviceCategory']);
}
But it gives Unknown method 'relatedServices'
Is there any thing wrong I am doing ?

Answer 1

The code is in the wrong class
In the question:
class ServiceCategory extends Entity
This is an entity class
$relatedServices = $this->ServiceCategories->relatedServices($id);
This is making a call on a table object, table objects and entities do not inherit from each other, the method is unavailable to the table class.
Move the code to the table class
The direct solution is to move the code to the table class:
// src/Model/Table/ServiceCategoriesTable.php
namespace App\Model\Table;
class ServiceCategoriesTable extends Table
{
public function relatedServices($id)
{
return $this->find('all', [
'conditions' => [
'where' => [
'id !=' => $id
],
'limit' => 5
]
]);
}
Though the arguably correct/better way to do that is to implement a finder:
// src/Model/Table/ServiceCategoriesTable.php
namespace App\Model\Table;
use Cake\ORM\Query;
use \InvalidArgumentException;
class ServiceCategoriesTable extends Table
{
public function findRelatedServices(Query $query, array $options)
{
if (!isset($options['id'])) {
$message = sprintf('No id in options: %s', json_encode($options));
throw new InvalidArgumentException($message);
}
$query->where(['id !=' => $options['id']);
return $query;
}
Which would be called in exactly the same way as other find calls:
$relatedServices = $this->ServiceCategories->find(
'relatedServices',
['id' => $id]
);