TYPO3 f:form with additional arguments, where submit not update the arguments - typo3

Question

I am using TYPO3 10.4.15
My edit view:
f:section name="content">
<h1>Edit Album</h1>
<f:flashMessages />
<f:render partial="FormErrors" />
<f:form id='fNew' action="update" name="album" object="{album}" arguments="{mode:mode, disc:disc}" >
<f:render partial="Album/FormFields" arguments="{album:album, disc:disc}" />
<f:form.submit value="Save" />
</f:form>
</f:section>
</html>
This is the relevant part of the partial formfields.html:
<f:if condition='{disc}'>
<input type='text' name="disc[0][name][]" />
</f:if>
The error_log with the disc structure looks:
Update-Disc: array (
0 =>
array (
'name' => '',
'trackNum' => '1',
'track' =>
array (
0 =>
array (
'title' => '',
'duration' => '0',
'composer' => '',
'texter' => '',
'musicFile' => '',
'imageFile' => '',
),
),
),
)
And this is the "updateAction" part of the controller
/**
* action update
*
* #param \HGA\Album\Domain\Model\Album $album
* #param string $mode
* #param array $disc
* #return string|object|null|void
*/
public function updateAction(\HGA\Album\Domain\Model\Album $album, $mode, $disc)
{
error_log("Update-Disc: " . var_export($disc, true) . " Mode: " . $mode, 0);
if ($mode == 'tracks') {
$this->editAction($album, $mode, $disc);
}
error_log("Update: " . var_export($album, true) . " Mode: " . $mode, 0);
$this->addFlashMessage('The object was updated. Please be aware that this action is publicly accessible unless you implement an access check. See https://docs.typo3.org/typo3cms/extensions/extension_builder/User/Index.html', '', \TYPO3\CMS\Core\Messaging\AbstractMessage::WARNING);
$this->albumRepository->update($album);
$this->redirect('list');
}
If I write something into the text input field and execute submit, I get the error_log you can see above. The value I have typed in the input field is missing. It is only the array, as I have send it to the view.
The mode string will be transmitted correctly, but with the disc array is maybe something wrong!
The disc array is more complex, but I made it simple, because I need to understand how it works in general.
I also need this additional disc array and can not doing it with the album object!
Thanks in advance for your help.

Answer 1

You are ignoring your plugin's namespace in combination with misinterpretation of f:form arguments.
Each field for your plugin has a prefix like tx_hgaalbum... followed by your property's name in square brackets. So the fieldname for disc should look like tx_hgaalbum...[disc]. Have a look into the HTML code and see which names are generated for the other properties.
The second problem is using the arguments in the form-ViewHelper. This will only add the arguments to the action URI of your form. That's why you're getting your initial values for disc.