/**
  * Declares an association between this object and a ChildUser object.
  *
  * @param  ChildUser $v
  * @return $this|\Comment The current object (for fluent API support)
  * @throws PropelException
  */
 public function setAuthor(ChildUser $v = null)
 {
     if ($v === null) {
         $this->setAuthorUserId(NULL);
     } else {
         $this->setAuthorUserId($v->getUserId());
     }
     $this->aAuthor = $v;
     // Add binding for other direction of this n:n relationship.
     // If this object has already been added to the ChildUser object, it will not be re-added.
     if ($v !== null) {
         $v->addComment($this);
     }
     return $this;
 }