Laravel : key() expects parameter 1 to be array, integer given

Question

I want save user id comes with create tag in post create form , but show me this error

key() expects parameter 1 to be array, integer given

post controller:

public function store(PoemsCreateRequest $request)
{
    $data = $request->all();
    $post = Post::create($data);
    if ($post && $post instanceof Post) {
        $tagList = $request->input('tags');
        $tags = collect($tagList)->mapToGroups(function (string $tag) {
            return Tag::firstOrCreate(['name' => $tag, 'author' => Auth::id()])->id;
        })->all();
        return redirect()->back();
    }

}

how to fix it?

Can we see a full stack trace on what line of yours it fails? — mrhn
– mrhn, Commented Sep 11, 2020 at 21:47

patricus · Accepted Answer · 2020-09-12 01:24:25Z

1

The closure that you passed into the mapToGroups() function is returning an int, which is not correct. It must return an array.

From the documentation:

The mapToGroups method groups the collection's items by the given callback. The callback should return an associative array containing a single key / value pair, thus forming a new collection of grouped values

answered Sep 12, 2020 at 1:24

patricus

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