Re: cakephp3 - Trying to use combine() with entities without sucess

$combined = collection($entities)->combine('id', function ($row) { return $row}, 'group');

The function in the second argument will return the same row without extracting any property from it. This is also equivalent to doing:

$combined = collection($entities)->indexBy('id')->groupBy('group');

On Saturday, May 9, 2015 at 4:33:54 PM UTC+2, Aday Talavera wrote:

In CakePHP 2 I usually used Hash::combine to provide me some useful grouping of the DB data.
Let me show you an example:

Original array:

<?php $data_rows = $this->find('all', $query); ?>

// Output
array(
    (int) 0 => array(
        'DataRow' => array(
            'id' => '70',
            'section_id' => '2',
            'group' => 'extrahotelero',
            'date' => '2014-01-01',
            'value' => '93150'
        )
    ),
    (int) 1 => array(
        'DataRow' => array(
            'id' => '202',
            'section_id' => '5',
            'group' => 'hotelero',
            'date' => '2014-01-01',
            'value' => '91.83'
        )
    ),
    ### more results ###
)

Use combine to group results in a fancy way:

<?php $data_rows = Hash::combine($data_rows, '{n}.DataRow.id', '{n}.DataRow', '{n}.DataRow.group'); ?>

//Output
array(
    'extrahotelero' => array(
        (int) 70 => array(
            'id' => '70',
            'section_id' => '2',
            'group' => 'extrahotelero',
            'date' => '2014-01-01',
            'value' => '93150'
        ),
        (int) 97 => array(
            'id' => '97',
            'section_id' => '5',
            'group' => 'extrahotelero',
            'date' => '2014-01-01',
            'value' => '48.91'
        ),
        ### more results ###
    ),
    'hotelero' => array(
        (int) 202 => array(
            'id' => '202',
            'section_id' => '5',
            'group' => 'hotelero',
            'date' => '2014-01-01',
            'value' => '91.83'
        ),
        (int) 193 => array(
            'id' => '193',
            'section_id' => '4',
            'group' => 'hotelero',
            'date' => '2014-01-01',
            'value' => '7'
        ),
        ### more results ###
)

I tried the same with CakePHP3 without success using Collection:combine (as part of transformation after a query) and even tried mapReduce() (the result was near the expected, but I don't know how to get second level array keys.
Collection:indexBy() and Collection:groupBy() helped.

Maybe the problem is a limitation of the dot notation?
Collection:combine('id', '{n}', 'group') didn't work.

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