RequestHandlerInterface getRequestHandler()

bool isValid() Returns whether the form and all children are valid. If the form is not

class PreloadedExtension implements

mixed getAttribute(string $name, mixed $default = null) Returns the value of the given attribute

FormError|

mixed transform(mixed $value) Transforms a value from the original representation to a transformed

bool has(string $name) Unsupported method.

FormInterface setData(mixed $modelData)

FormFactoryInterface getFormFactory()

FormConfigBuilderInterface