Validate multiple input in CodeIgniter 4

Question

This is the code in my controller:

$fields = array(
    "user_id[]" => "required"
);

print_r($this->request->getPost("user_id"));

$validate = $this->validate($fields);

if (!$validate) {
    $validation = \Config\Services::validation();
    $message = $validation->getErrors();
    echo json_encode($message);
    exit();
}

I'm getting this output:

Array
(
    [0] => 7
    [1] => 17
)
{"user_id[]":"The user_id[] field is required."}

Why it's showing error when there has values?

Looking for help. Thanks in advance.

Can you try testing "user_id.0" => "required" and see if this validation works for you ? — Dhaval Chheda
– Dhaval Chheda, Commented Mar 12, 2021 at 18:58
@DhavalChheda, it's not marking as required then. I mean if nothing posted, it's not showing error. — Encrypted
– Encrypted, Commented Mar 12, 2021 at 19:34
Can you var dump and show what you have passed with the modification of the code? Also you don't need $validation = \Config\Services::validation(); in your controller. You have to use $this->validator->getErrors() since Validator is already attached to the instance of Controller. — Dhaval Chheda
– Dhaval Chheda, Commented Mar 13, 2021 at 3:53
Also one issue is this particular line : $final_fields[$field] = $validate; . In CI4, Vaidator key is supposed to be string and arrays are represented with a dot parameter. So instead of $final_fields[$field] you have to do following: $final_fields.$field and this should be a string such as "user_id.0" then only the validator will be able to function properly. Refer : codeigniter4.github.io/userguide/libraries/… — Dhaval Chheda
– Dhaval Chheda, Commented Mar 13, 2021 at 3:59

Encrypted · Accepted Answer · 2021-03-13 09:20:22Z

1

Found a solution from CI forum.

Instead of this,

$fields = array(
    "user_id[]" => "required"
);

Write:

$fields = array(
    "user_id.*" => "required"
);

answered Mar 13, 2021 at 9:20

Encrypted

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