Validation error "This value should not be blank" when submitting a form on production website - forms

Question

I'm developing a website using php 7.4, symfony 5.4 and twig. This website is deployed on several servers.
On one of the servers (RedHat), a form cannot be submitted. I get the following error 4 times : "This value should not be blank.".
The messages appear on top of the form and aren't attached to a particular field.
I can't reproduce this error on another server, nor on my development environment...
The problem might comes from a validator but I'm not sure whether it's a symfony or a doctrine error.
The POST data is identical on production server and dev environment :
report_selection[iFrame]: 1
report_selection[dteFrom]: 2023-01-30 07:00
report_selection[dteTo]: 2023-01-31 07:00
report_selection[reportType]: 1
report_selection[size]: 200
report_selection[product]: 1
report_selection[submit]:
I assume that the empty field submit is not a problem since other forms work fine while having the same field empty.
The database structure is the same on all servers.
Here is the form's code :
public function buildForm(FormBuilderInterface $builder, array $options): void
{
$bDisplaySize = $options['bDisplaySize'];
$bDisplayReportType = $options['bDisplayReportType'];
$bDisplayProduct = $options['bDisplayProduct'];
$defaultValue = $options['defaultValue'];
$em = $options['entity_manager'];
list($H, $m) = explode(":", $iShiftStart);
$initialFromDate = (new DateTime())->modify('-'.$H.' hour');
$initialFromDate = $initialFromDate->modify('-1 day');
$initialFromDate->setTime((int)$iShiftStart, (int)$m, 0);
$initialToDate = clone $initialFromDate;
$initialToDate = $initialToDate->modify('+1 day');
$builder->add(
'iFrame',
ChoiceType::class,
array(
'label' => 'master.preselection',
'choices' => [
'master.yesterday' => false,
'master.today' => false,
'master.thisWeek' => false,
'master.lastWeek' => false,
'master.thisMonth' => false,
'master.lastMonth' => false,
'master.memomryDate' => false,
],
'attr' => ['onchange' => 'refreshPreselectedChoices()'],
'choice_attr' => [
'master.yesterday' => [],
'master.today' => ['selected' => 'selected'],
'master.thisWeek' => [],
'master.lastWeek' => [],
'master.thisMonth' => [],
'master.lastMonth' => [],
'master.memomryDate' => ['disabled' => true],
],
)
);
$builder->add(
'dteFrom',
TextType::class,
array(
'label' => 'form.from',
'data' => $initialFromDate->format('Y-m-d H:i'),
'attr' => array(
'style' => 'width:150px;',
'oninput' => 'dteFromToCustom()',
'onchange' => 'dteFromToCustom()',
),
)
);
$builder->add(
'dteTo',
TextType::class,
array(
'label' => 'form.to',
'data' => $initialToDate->format('Y-m-d H:i'),
'attr' => array(
'label' => 'form.to',
'style' => 'width:150px;',
'oninput' => 'dteFromToCustom()',
'onchange' => 'dteFromToCustom()',
),
)
);
if ($bDisplayReportType) {
$builder->add(
'reportType',
ChoiceType::class,
array(
'label' => 'summaryReport.data',
'choices' => array(
'summaryReport.type1' => '1',
'summaryReport.type2' => '2',
),
)
);
}
if ($bDisplaySize) {
$builder->add(
'size',
EntityType::class,
array(
'class' => ProductsSizeSpecs::class,
'choice_label' => 'rSize',
'choice_value' => 'rSize',
'placeholder' => '',
'label' => 'form.size',
'required' => false,
'mapped' => false,
'query_builder' => function (EntityRepository $er) {
return $er->createQueryBuilder('e')
->groupBy('e.rSize')
->orderBy('e.rSize', 'ASC');
},
)
);
}
if ($bDisplayProduct) {
$builder->add(
'product',
EntityType::class,
array(
'class' => Products::class,
'choice_label' => 'sNumber',
'choice_value' => 'sNumber',
'placeholder' => '',
'label' => 'master.product',
'required' => false,
'query_builder' => function (EntityRepository $er) {
return $er->createQueryBuilder('e')
->groupBy('e.sNumber')
->orderBy('e.sNumber', 'ASC');
},
)
);
}
$builder->add(
'submit',
SubmitType::class,
array(
'label' => 'form.submit',
'attr' => array('class' => 'btn btn-primary'),
)
);
}
Other forms use the exact same code with more or less options.
I search a way to debug this on the production server (list/dump of 'blank' fields?).
Any hint will be appreciated, thanks !

Answer 1

Indeed I had some #Assert\NotBlank on several columns of an Entity.
Why the error was only on this server :
An instance (db record) of this Entity was NULL on those columns (which is an anormal behavior).
All the instances where retrieved to populate the form's dropdowns (as 'default' data).
It looks like the validator is checking the submitted 'data' AND those 'default' values since they are part of the form.
There were 4 asserted columns, so that's why I had 4 errors messages.
What I've done to find this out :
Added a dump($this->form->getErrors()) instruction on the callback processing the submitted form. It displayed the 4 entity's columns giving me hard time.
Went into db to see the corrupted record, and deleted it.
To prevent this in the future I might change the default values of these columns from NULL to something else, a basic string or a 0 value, and search the process that led to this corrupted record in db.
Thanks for your hints guys !