/**
* Declares an association between this object and a Grade object.
*
* @param Grade $v
* @return Periodo The current object (for fluent API support)
* @throws PropelException
*/
public function setGrade(Grade $v = null)
{
if ($v === null) {
$this->setGradeId(NULL);
} else {
$this->setGradeId($v->getId());
}
$this->aGrade = $v;
// Add binding for other direction of this n:n relationship.
// If this object has already been added to the Grade object, it will not be re-added.
if ($v !== null) {
$v->addPeriodo($this);
}
return $this;
}