CODEWITHSUNDEEP
laravel
eskimo
eskimo

Reputation: 2624

Laravel collection is empty after using map

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.

Upvotes: 0

Views: 1387

Answers (1)

John Lobo
John Lobo

Reputation: 15319

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

Upvotes: 2

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