sonataadminbundle DateTime::__construct() expects parameter 1 to be a String, Object Given

Question

When I change the datatime with Sonata, it returns the error:

DateTime::__construct() expects parameter 1 to be string, object given

This is my entity:

public function setExpiry($dateAsString = null) {
   $this->expiry = new \DateTime($dateAsString);         
} 

Why am I getting this error?

Answer 1

change the setter like this, because sonata calling it with a DateTime object paramter

public function setExpiry(\DateTime $datetime){
    $this->expiry = $datetime;
}