CollectionType expected argument of type "string or null", "array" given at property path "cc"

Question

Can someone explain why i am getting this error? I am using CollectionType for first time. Used documentation. Here is my part of where i am trying to use CollectionType:

$builder->add('cc', CollectionType::class, [
         'required' => false,
         'entry_type' => EmailType::class
])

and here is my request:

{
    "email" => "[email protected]",
    "description" => "test description",
    "subject" => "test",
    "cc" => array:1 [
         0 => "[email protected]"
    ]
}

Do you map this to a model, i.e. is the result from the form a PHP class? If so, could you post the code for that as well? — dbrumann
– dbrumann, Commented Feb 13, 2019 at 10:18
no, i am just trying to submit api request using formbuilder. actually i check if it works or not. bu without any success. is the request wrong? but when i update request to "cc" => "some string" validation returns that value is not valid @dbrumann — MRustamzade
– MRustamzade, Commented Feb 13, 2019 at 10:21

MRustamzade · Accepted Answer · 2019-02-13 10:58:29Z

4

So my problem was in EmailEntity where cc is string. I have used Data Transformers to fix this problem. Just added:

$builder->get('cc')
        ->addModelTransformer(new CallbackTransformer(
            function ($array) {
                return $array;
            },
            function ($array) {
                return json_encode($array);
            }
));

And don't forget to add use Symfony\Component\Form\CallbackTransformer;

answered Feb 13, 2019 at 10:58

MRustamzade

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Comments

code_gamer · Accepted Answer · 2020-02-21 07:48:40Z

1

I had pretty much the same problem as you, but your exact solution didn't work for me, but you put me on a path to solve it, therefore gave you +1 of course. I wanted to write this as a comment but it was too long. Here is what I had to change your solution to to make it work:

$builder->get('myCollection')
    ->addModelTransformer(new CallbackTransformer(
        function ($array) {
            return $array;
        },
        function ($array) {
            $res = array();
            foreach($array as $item) {
                if ($item === null) {
                    $item = '';
                }
                $res[] = $item;
            }

            return $res;
        }
    ));

edited Feb 21, 2020 at 7:48

answered Feb 17, 2020 at 14:53

code_gamer

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