Laravel collection is empty after using map

Question

This works, all posts are dumped with the votes property set correctly (if it's null then it's updated to have the value 0):

$posts = Post::all();

foreach($posts as $post) {
  $post->priority = $post->priority ?? 0;
}

dd($posts);

But if I do this I get an empty collection back:

$posts = Post::all();

$posts = $posts->map(function ($post) {
    $post->priority = $post->priority ?? 0;
});

dd($posts);

From the docs it says that map returns a new collection instance and that if you want to modify the existing collection you should use transform, but that produces the same result.

John Lobo · Accepted Answer · 2021-08-10 13:21:08Z

2

You should return after modifying data inside map

$posts = Post::all();

$posts = $posts->map(function ($post) {

    $post->priority = $post->priority ?? 0;

    return $post;
});

dd($posts);

As per doc

The map method iterates through the collection and passes each value to the given callback. The callback is free to modify the item and return it, thus forming a new collection of modified items:

Ref:https://laravel.com/docs/8.x/collections#method-map

answered Aug 10, 2021 at 13:21

John Lobo

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