Zend Framework child collection not hydrating properly

Question

I have an issue with the values of a child collection not being hydrated properly. I'm using zend framework 3 with doctrine 2.

Since it's a lot of code that I would have to copy, I will describe what I'm doing and if needed I will update with code.

We have the following:

• VillaForm which is a Form element
• VillaFieldset which is a Fieldset element and is the base fieldset of VillaForm

• FacilityCategoriesFieldset which is a Fieldset that is used for a Collection element in the VillaFieldset

      $this->add([
      'type' => 'Zend\Form\Element\Collection',
      'name' => 'facilityCategories',
      'options' => [
          'count' => 1,
          'allow_add' => true,
          'allow_remove' => true,
          'create_new_objects' => true,
          'target_element' => [
              'type' => FacilityCategoryFieldset::class,
          ],
      ],
  ]);
  

• FacilitiesFieldset which is a a Fieldset that is used for a Collection element in the FacilityCategoriesFieldset

      $this->add([
      'type' => 'Zend\Form\Element\Collection',
      'name' => 'facilities',
      'options' => [
          'count' => 1,
          'allow_add' => true,
          'allow_remove' => true,
          'create_new_objects' => true,
          'target_element' => [
              'type' => FacilityFieldset::class,
          ],
      ],
  ]);
  

So viewing from above we have

VillaForm contains VillaFieldset that contains Collection of FacilityCategoriesFieldset which contains a Collection of FacilitiesFieldset

Let's say we have this example on the actual form page.

- Row A of FacilityCategoriesFieldset 
  - Row 1 of FacilitiesFieldset
  - Row 2 of FacilitiesFieldset
  - Row 3 of FacilitiesFieldset

- Row B of FacilityCategoriesFieldset 
  - Row x of FacilitiesFieldset
  - Row y of FacilitiesFieldset
  - Row z of FacilitiesFieldset

My issue is that after the form is submitted, although the post data is correct, after the hydration the result will be like so:

- Row A of FacilityCategoriesFieldset 
  - Row x of FacilitiesFieldset
  - Row y of FacilitiesFieldset
  - Row z of FacilitiesFieldset

- Row B of FacilityCategoriesFieldset 
  - Row x of FacilitiesFieldset
  - Row y of FacilitiesFieldset
  - Row z of FacilitiesFieldset

The rows of the FacilitiesFieldset of the very last row of the FacilityCategoriesFieldset are used for all the rows of FacilitiesFieldset.

This only happens when a have a fieldset with a collection with another collection. Does anyone have a hint of what I might be doing wrong? I will give you any other info/code if you need it.

Thanks a lot.

Answer 1

Your implementation of a Collection is slightly off. You shouldn't give the type of a Collection as the FQCN, but the actual object (Fieldset).

Try this:

/**
 * @var CustomFieldset
 */
protected $customFieldset;

public function __construct(CustomFieldset $customFieldset) {
    $this->customFieldset = $customFieldset;
}

// init()
$this->add(
    [
        'type'     => Collection::class,
        'required' => true,
        'name'     => 'customFieldset',
        'options'  => [
            'label'                  => 'Custom fieldsets',
            'count'                  => 1,
            'allow_add'              => true,
            'allow_remove'           => true,
            'should_create_template' => true,
            'target_element'         => $this->customFieldset,
        ],
    ]
);