How to extract an array item from an array variable in Laravel 5?

Question

I'm new to laravel and now currently using Laravel version 5.2.

I have this set of array:

    {
        "id": 2,
        "title": 'sample',
        "question_index": 1,
        "question": "Hope you could help me buddy.",
        "data": [
                    {
                        "id": 1,
                        "answer": 'yes',
                    }
                ]
    }

The array was created using the following eloquent query:

$exam_data = $this->template->where('id', $id)
                            ->with('data')
                            ->get();

Now I wanted to retrieve the 'data' array inside that array using Laravel 5.

I tried the following code but to no avail...

$user_data = $exam_data->data;

$user_data = $exam_data['data'];

$user_data = $exam_data->get('data');

Though I can pluck it using this:

$user_data = $exam_data->pluck('data');

which has this result (I don't know why but I'm not satisfied on it):

[
    [
        {
            "id": 1,
            "answer": 'yes',
        }
    ]
]

Is there any ways or method that I can use to retrieve the 'data' array?

Like For example:

$user_data = $exam_data->data;

and how about accessing 'answer' field?

$user_data = $exam_data->data->answer;
Is this possible?

Appreciate any comments or suggestions. thanks!

@emuigai Yup I already did that. I also tried to convert it to JSON and Array but still to no avail. — Nelson Melecio
– Nelson Melecio, Commented Feb 25, 2016 at 10:52

Damien Pirsy · Accepted Answer · 2016-02-25 11:02:22Z

1

$exam_data = $this->template->where('id', $id)
                            ->with('data')
                            ->get();

returns a Collection of multiple records, something like:

Collection [
  0 => Collection,
  1 => Collection,
]

That's why you can't access "data" directly from $exam_data, and that's what ->pluck() does for you.

pluck() does the same as:

$filtered = [];
foreach ($exam_data as $exam) {
  $filtered[] = $exam->data;
}

if you dd($filtered) you get what you're after.

If you are expecting a single record, though, you could use ->first() instead of ->get(), which returns a single Collection and there you can access the data relationship with:

$exam_data = ..... ->first();
$data = $exam_data->data;

answered Feb 25, 2016 at 11:02

Damien Pirsy

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3 Comments

Damien Pirsy Over a year ago

Well, it depends on the relationship, if is single or multiple (belongsTo or belongsToMany, for ex.). dump $exam_data->data and you'll see if it's a collection of multiple items or just one ;)

Nelson Melecio Over a year ago

Wow a thorough explanation! I tried it and it works. The first() method saves the trouble. Thanks mate. :)

Nelson Melecio Over a year ago

I tried accessing the member and the first() method also applies. It's all about recursion after all. Now I understand everything needed for it. thanks much

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