Could not determine access type for property "file"
Please add "'mapped' => false," to form builder.
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('file', FileType::class,
array(
'data_class' => null,
'mapped' => false,
))
->add('name', TextType::class)
;
}
Those who say that it is wrong to dissolve, see the test there. I'm not the one who made it wrong.
Test code: https://github.com/symfony/property-access/blob/master/Tests/PropertyAccessorCollectionTest.php#L151
A second solution is to add function setXxx to the property that gives an error in class Entity.
public $xxx;
public function setXxx(Array $xxx)
{
$this->xxx = $xxx;
}
Or
public function __construct()
{
$this->xxx = new ArrayCollection();
}
Video Link: https://knpuniversity.com/screencast/doctrine-relations/create-genus-note
My English is bad, I can tell you.
Setting mapped => false is not the real solution, because the field IS mapped to the entity.
In my case, I have a OneToMany relation, so I need the field mapped in order to use the 'cascase' => {"all"} option.
If the field is not mapped, then you must to persist the related entity manually. That's no good.