Transform nested collection in laravel - php

Question

I have a nested collection that I want to transform, pulling some keys "up a level" and discarding some other keys.
Every item in the collection has an allergens property.
"allergens": [
{
"id": 2001,
"info": "Allergy advice",
"status": "does_contain",
"product_id": 71576,
"allergen_id": 1,
"allergen": {
"id": 1,
"name": "Celery"
}
},
{
"id": 2002,
"info": "Allergy advice",
"status": "may_contain",
"product_id": 71576,
"allergen_id": 11,
"allergen": {
"id": 11,
"name": "Peanuts"
}
}
],
I need to make each items allergens property, look like
"allergens": [
{
"id": 1,
"name": "Celery"
"status": "does_contain",
},
{
"id": 11,
"name": "Peanuts"
"status": "does_contain",
},
],
I've tried the following:
$collection = $collection->transform(function ($item, $key) {
$item->allergens = $item->allergens->map(function ($allergen) {
return [
'id' => $allergen->allergen->id,
'name' => $allergen->allergen->name,
'status' => $allergen->status,
];
});
return $item;
});
But it doesn't overwrite the allergens property

Answer 1

Since you're posting your collection as JSON, I reverse engineered what your actual collection would look like. Turns out, your transform() works fine as far as I can tell. Maybe that helps you to find differences between my and your collection which might lead you to your problem/solution:
$collection = collect([
(object)[
"allergens" => collect([
(object)[
"id" => 2001,
"info" => "Allergy advice",
"status" => "does_contain",
"product_id" => 71576,
"allergen_id" => 1,
"allergen" => (object)[
"id" => 1,
"name" => "Celery"
]
],
(object)[
"id" => 2002,
"info" => "Allergy advice",
"status" => "may_contain",
"product_id" => 71576,
"allergen_id" => 11,
"allergen" => (object)[
"id" => 11,
"name" => "Peanuts"
]
]
]),
]
]);
$collection = $collection->transform(function ($item, $key) {
$item->allergens = $item->allergens->map(function ($allergen) {
return [
'id' => $allergen->allergen->id,
'name' => $allergen->allergen->name,
'status' => $allergen->status,
];
});
return $item;
});
dd($collection);
Result:
Illuminate\Support\Collection {#1779 ▼
#items: array:1 [▼
0 => {#1791 ▼
+"allergens": Illuminate\Support\Collection {#1775 ▼
#items: array:2 [▼
0 => array:3 [▼
"id" => 1
"name" => "Celery"
"status" => "does_contain"
]
1 => array:3 [▼
"id" => 11
"name" => "Peanuts"
"status" => "may_contain"
]
]
}
}
]
}