cake 3 - is it possible to use formatResults to stacking multiple operations like mapper/reducer?

Hi,

I'm trying to figure out if it's possible to use formatResults in custom finder methods to use ORM chain. I have seen in docs the example with mapper reducer.

In my table object i have

public findFlat($query, $options = []) {

       return $query->formatResults(function($results, $query) {

            return $results->map(function($row) {

                foreach ($row['content']->toArray() as $key => $value) {

                    $row[$key] = $value;

                }

                unset($row['content']);

                return $row;

            });

        });

}

then in my controller I have

$images = TableRegistry::get('ImageObjects');

$result = $images->find('flat');

$result->contain(['Contents', 'Streams']);

debug($result->toArray());

In this way it works but if I add first()

$result->first();

then I obtain a fatal error in findFlat() method

Error: Call to a member function toArray() on a non-object

Any help? 

Am I using wrong formatResults()? Is it possible to chain only mapper reducer?

thanks

alberto

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