Collection method to achieve the following

I would like to know how to achieve the following with Laravel Collections. Also would like to know what would be the name of this, just to replace this useless thread title. Thank you!

$items = [
    [
        'name' => 'Apple', 
        'color' => 'green',
        'code' => 'foo',
        'quantity' => 2
    ],
    [
        'name' => 'Orange',
        'color' => 'orange',
        'code' => 'bar',
        'quantity' => 1
    ],
    [
        'name' => 'Lemon',
        'color' => 'yellow',
        'code' => 'baz', 
        'quantity' => 3
    ]
];

$units = [];

foreach($items as $item) {
    for ($i=0; $i < $item['quantity']; $i++) {
        $units[] = [
            'code' => $item['code'] . '-' . ($i + 1),
            'name' => $item['name'],
            'color' => $item['color'],
        ];
    }
}

/*
    [
        ['code' => 'foo-1', 'name' => 'Apple', 'color' => 'green'],
        ['code' => 'foo-2', 'name' => 'Apple', 'color' => 'green'],
        ['code' => 'bar-1', 'name' => 'Orange', 'color' => 'orange'],
        ['code' => 'baz-1', 'name' => 'Lemon', 'color' => 'yellow'],
        ['code' => 'baz-2', 'name' => 'Lemon', 'color' => 'yellow'],
        ['code' => 'baz-3', 'name' => 'Lemon', 'color' => 'yellow']
    ]
*/

tykus

6 years ago

Level 104

$units = collect($items)->map(function ($item) {
    return  [
        'name' => $item['name'],
        'color' => $item['color'],
    ];
});

ChristophHarms

6 years ago

Level 18

$items = collect([
    collect(['name' => 'Apple',  'color' => 'green', 'quantity' => 2]),
    collect(['name' => 'Orange', 'color' => 'orange', 'quantity' => 1]),
    collect(['name' => 'Lemon', 'color' => 'yellow', 'quantity' => 3]),
]);

$withoutQty = $items->map->only(['name', 'color']);

return $withoutQty->toArray();
/*
[
     [
       "name" => "Apple",
       "color" => "green",
     ],
     [
       "name" => "Orange",
       "color" => "orange",
     ],
     [
       "name" => "Lemon",
       "color" => "yellow",
     ],
   ]
*/

Line 7 can be a bit confusing (at least it was to me) when you never heard of Higher Order Messages. Without Higher Order Messages, it would look like this:

$withoutQty = $items->map(function ($subCollection) {
        return $subCollection->only(['name', 'color']);
});

As for a name for this... I don't know, really. Filter out keys from sub-collections maybe?

vguerrerobosch

6 years ago

Level 7

Thank you @tykus. I was just editing the question while you where posting your answer. In any case, I think map only doesn't achieve what it's wanted.

vguerrerobosch

6 years ago

Level 7

To clarify, the output is expected to have as many elements as the sum of items per its quantities. @tykus @christophharms

tykus

6 years ago

Best Answer

Level 104

You can use the index in the map:

$units = collect($items)->map(function ($item, $index) {
    return  [
'code' => $item['code'] . '-' $index+1,
        'name' => $item['name'],
        'color' => $item['color'],
    ];
});

EDIT just saw the update

collect($items)->flatMap(function ($item) {
    return collect()->times($item['quantity'])->map(function ($index) use ($item) {
        return  [
            'code' => $item['code'] . '-' . $index,
            'name' => $item['name'],
            'color' => $item['color'],
        ];
})->all();
});

2 likes

vguerrerobosch

6 years ago

Level 7

Yeah! times was what was looking for! Thank you so much!

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