Laravel Collection get unique values from nested datastructure

Question

I want to use Laravel 5.1 Collection's Unique method to filter unique IDs from nested objects.

Given the data structure

{
  "key1": [
    {"id": 1},
    {"id": 1}
  ],
  "key2": [
    {"id": 1},
    {"id": 2}
  ]
}

I want to return the same datastructure with duplicate id 1 removed from "key 1".

I wanted to use $unique = $collection->unique('id');, but this doesn't seem to apply to a nested datastructure as I have.

So I thought to use $collection

    $input = $request->all();

    $collection = collect($input);

    $collection->each(function($obj, $key) {
        //$key is "key1", "key2"
        //obj is the associated array of objects containing IDs
    })->unique('id');

I don't quite know how to structure this.

The result structure should be:

{
  "key1": [
    {"id": 1}
  ],
  "key2": [
    {"id": 1},
    {"id": 2}
  ]
}

Joseph Silber · Accepted Answer · 2015-11-06 16:49:49Z

31

$collection = $collection->map(function ($array) {
    return collect($array)->unique('id')->all();
});

answered Nov 6, 2015 at 16:49

Joseph Silber

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Comments

Ali Bakhshandeh · Accepted Answer · 2021-05-29 00:51:36Z

10

If your data structure is nested a single level, be it arrays or objects, simple

$unique = $collection->unique('key')

does the job.

answered May 29, 2021 at 0:51

Ali Bakhshandeh

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Comments

pankaj · Accepted Answer · 2020-02-28 09:46:17Z

3

if you have numeric List then you can use this code

$dataList = [1,2,4,5,3,2,1,98,1,2,4,5,6];

$dataList  = collect( $dataList )->unique();

you will get all the unique list.

[1,2,4,5,3,98,6]

answered Feb 28, 2020 at 9:46

pankaj

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2 Comments

tristanbailey Over a year ago

You will get a collection with keys: Illuminate\Support\Collection {#4033 all: [0 => 1,1 => 2,2 => 4,3 => 5,4 => 3,7 => 98,12 => 6, ],}

CodeToLife Over a year ago

solved by this way

liviu blidar · Accepted Answer · 2022-07-29 12:56:54Z

0

This should also work, assuming I understood your question correctly and you're just trying to use the innermost value as your unique reference

$unique = $collection->unique('key.id')

answered Jul 29, 2022 at 12:56

liviu blidar

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Comments

alazarK · Accepted Answer · 2024-03-26 07:28:26Z

0

You could also try the following.

$unique = collect($input)->unique('*.id');

answered Mar 26, 2024 at 7:28

alazarK

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