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symfonysymfony-forms

Symfony HiddenType for a DateTime object

I have a simple form

   ->add('createDateTime', HiddenType::class)

Causing an error:

Object of class DateTime could not be converted to string

How do I work around this issue? I don't want to change the entity to return a string formatted date...

Any ideas?

Solution

  • As form inputs require a text representation of the data, you'll need to convert the value to a string with the help of a DataTransformer. Fortunately, Symfony comes with a transformer for DateTime objects, you just need to add it to your form field:

    $builder
    ->add('field') //...
    ->add('createDateTime', HiddenType::class);

$builder
    ->get('createDateTime')
    ->addModelTransformer(new DateTimeToStringTransformer());

    You can specify different timezones for conversion or format if you need to.