Sonata Admin compile form field from query string - symfony

Question

In Sonata Admin is it possible to set or precompile a value in a form taking it from the query string?
I have a custom page with a calendar and when I click a date on the calendar I would like to be redirected to the create page of an event where the date is already set from the query string. Something like:
http://localhost:8000/admin/app/event/create?date=2017-07-11

Answer 1

I solved it by using the request service and a field marked as 'mapped' => false on my form builder:
protected function configureFormFields(FormMapper $formMapper)
{
$request = $this->getRequest();
$dateParameter = $request->query->get('date');
$date = null;
if ($dateParameter) {
$date = \DateTime::createFromFormat('!Y-m-d', $dateParameter);
}
if (!$date) {
$formMapper
->add('date', DatePickerType::class)
->add('calendarDate', HiddenType::class, array(
'data' => null,
'mapped' => false,
))
;
} else {
$formMapper
->add('date', DatePickerType::class, array(
'data' => $date,
'disabled' => true,
))
->add('calendarDate', HiddenType::class, array(
'data' => $date->format('Y-m-d'),
'mapped' => false,
))
;
}
$formMapper
// other fields
->add('other_field', ModelType::class)
;
}
Then, on the following method I am updating the entity field:
public function prePersist($myEntity)
{
$this->preUpdate($myEntity);
}
public function preUpdate($myEntity)
{
$dateString = $this->getForm()->get('calendarDate')->getData();
if ($dateString) {
$date = \DateTime::createFromFormat('!Y-m-d', $dateString);
if ($date) {
$myEntity->setDate($date);
}
}
}
In this way I can use my form with or without the query string parameter date:
http://localhost:8000/admin/app/event/24/edit?date=2017-07-01
And in the HTML I have this:
<input type="hidden" id="s59664a9ea44ce_calendarDate" name="s59664a9ea44ce[calendarDate]" class=" form-control" value="2017-07-01" />
P.S. when someone gives a -1 it should be nice to explain why...