Structure item ID when merging structures

The CMS Questions
1

I’m creating a new structure from a set of structures from a set of pages:

'allServicesTranslated' => function () {
    $services = page('services')->children();
    $tags = new Structure();

    foreach ($services as $p) {
        $tags->add($p->servicesStructure()->toStructure());
    }
    return $tags;
},

I want to return these as options for a multiselect as they contain translations for tags:

servicesTranslated:
  type: multiselect
  translate: false
  options:
    type: query
    query: site.allServicesTranslated
    text: "{{ structureItem.en }}"
    value: "{{ structureItem.id }}"

If I dump the structure, everything has a consecutive number:

Kirby\Cms\Structure Object
(
    [0] => 0
    [1] => 1
    [2] => 2
    [3] => 3
    [4] => 4
    [5] => 5
    [6] => 6
    [7] => 7
    [8] => 8
    [9] => 9
    [10] => 10
    [11] => 11
    [12] => 12
    [13] => 13
    [14] => 14
    [15] => 15
    [16] => 16
    [17] => 17
    [18] => 18
    [19] => 19
    [20] => 20
    [21] => 21
    [22] => 22
    [23] => 23
)

However in the panel this only shows the last set of items added from the foreach loop because the id resets to 0 (I can see this if I dump with toArray):

Array
(
    [0] => Array
        (
            [en] => Identity Design
            [de] => Marken-Design
            [id] => 0
        )

    [1] => Array
        (
            [en] => User Experience Design
            [de] => UX-Design
            [id] => 1
        )
     ...

    [8] => Array
        (
            [en] => Branding
            [de] => Markenstrategie
            [id] => 0
        )

    [9] => Array
        (
            [en] => Research
            [de] => Marktforschung
            [id] => 1
        )
     ...

It appears that value: "{{ structureItem.id }}"is grabbing the original id rather than the new one from the merged structure. Is there any way around this?

2

A structure field doesn’t have an intrinsic id, i.e. there is no id stored for a structure field in the content file. So relying on this is pretty useless.

3

I see. I’ve used id() to retrieve a structure item before successfully, but never when merging structures. I’m trying to do what you detail here but have hit this issue. How would I retrieve the index of the structure item if not via id? Or does this just not work when merging structures?

Edit: for now I’m just using findBy and the en entry to return the structure item.

4

That would surprise me, unless you either add an id manually or the order of the entries never changes.