/**
  * Adds an object to the instance pool.
  *
  * Propel keeps cached copies of objects in an instance pool when they are retrieved
  * from the database.  In some cases -- especially when you override doSelect*()
  * methods in your stub classes -- you may need to explicitly add objects
  * to the cache in order to ensure that the same objects are always returned by doSelect*()
  * and retrieveByPK*() calls.
  *
  * @param      PcBlogCategory $value A PcBlogCategory object.
  * @param      string $key (optional) key to use for instance map (for performance boost if key was already calculated externally).
  */
 public static function addInstanceToPool(PcBlogCategory $obj, $key = null)
 {
     if (Propel::isInstancePoolingEnabled()) {
         if ($key === null) {
             $key = (string) $obj->getId();
         }
         // if key === null
         self::$instances[$key] = $obj;
     }
 }
 /**
  * Declares an association between this object and a PcBlogCategory object.
  *
  * @param      PcBlogCategory $v
  * @return     PcBlogCategoriesPosts The current object (for fluent API support)
  * @throws     PropelException
  */
 public function setPcBlogCategory(PcBlogCategory $v = null)
 {
     if ($v === null) {
         $this->setCategoryId(NULL);
     } else {
         $this->setCategoryId($v->getId());
     }
     $this->aPcBlogCategory = $v;
     // Add binding for other direction of this n:n relationship.
     // If this object has already been added to the PcBlogCategory object, it will not be re-added.
     if ($v !== null) {
         $v->addPcBlogCategoriesPosts($this);
     }
     return $this;
 }