/**
  * Retrieve object using using composite pkey values.
  * @param      int $article_id
  * @param      int $author_id
  * @param      PropelPDO $con
  * @return     ArticleAuthor
  */
 public static function retrieveByPK($article_id, $author_id, PropelPDO $con = null)
 {
     $key = serialize(array((string) $article_id, (string) $author_id));
     if (null !== ($obj = ArticleAuthorPeer::getInstanceFromPool($key))) {
         return $obj;
     }
     if ($con === null) {
         $con = Propel::getConnection(ArticleAuthorPeer::DATABASE_NAME, Propel::CONNECTION_READ);
     }
     $criteria = new Criteria(ArticleAuthorPeer::DATABASE_NAME);
     $criteria->add(ArticleAuthorPeer::ARTICLE_ID, $article_id);
     $criteria->add(ArticleAuthorPeer::AUTHOR_ID, $author_id);
     $v = ArticleAuthorPeer::doSelect($criteria, $con);
     return !empty($v) ? $v[0] : null;
 }
 /**
  * If this collection has already been initialized with
  * an identical criteria, it returns the collection.
  * Otherwise if this Author is new, it will return
  * an empty collection; or if this Author has previously
  * been saved, it will retrieve related ArticleAuthors from storage.
  *
  * This method is protected by default in order to keep the public
  * api reasonable.  You can provide public methods for those you
  * actually need in Author.
  */
 public function getArticleAuthorsJoinArticle($criteria = null, $con = null, $join_behavior = Criteria::LEFT_JOIN)
 {
     if ($criteria === null) {
         $criteria = new Criteria(AuthorPeer::DATABASE_NAME);
     } elseif ($criteria instanceof Criteria) {
         $criteria = clone $criteria;
     }
     if ($this->collArticleAuthors === null) {
         if ($this->isNew()) {
             $this->collArticleAuthors = array();
         } else {
             $criteria->add(ArticleAuthorPeer::AUTHOR_ID, $this->id);
             $this->collArticleAuthors = ArticleAuthorPeer::doSelectJoinArticle($criteria, $con, $join_behavior);
         }
     } else {
         // the following code is to determine if a new query is
         // called for.  If the criteria is the same as the last
         // one, just return the collection.
         $criteria->add(ArticleAuthorPeer::AUTHOR_ID, $this->id);
         if (!isset($this->lastArticleAuthorCriteria) || !$this->lastArticleAuthorCriteria->equals($criteria)) {
             $this->collArticleAuthors = ArticleAuthorPeer::doSelectJoinArticle($criteria, $con, $join_behavior);
         }
     }
     $this->lastArticleAuthorCriteria = $criteria;
     return $this->collArticleAuthors;
 }
 /**
  * Populates the object using an array.
  *
  * This is particularly useful when populating an object from one of the
  * request arrays (e.g. $_POST).  This method goes through the column
  * names, checking to see whether a matching key exists in populated
  * array. If so the setByName() method is called for that column.
  *
  * You can specify the key type of the array by additionally passing one
  * of the class type constants BasePeer::TYPE_PHPNAME, BasePeer::TYPE_STUDLYPHPNAME,
  * BasePeer::TYPE_COLNAME, BasePeer::TYPE_FIELDNAME, BasePeer::TYPE_NUM.
  * The default key type is the column's phpname (e.g. 'AuthorId')
  *
  * @param      array  $arr     An array to populate the object from.
  * @param      string $keyType The type of keys the array uses.
  * @return     void
  */
 public function fromArray($arr, $keyType = BasePeer::TYPE_PHPNAME)
 {
     $keys = ArticleAuthorPeer::getFieldNames($keyType);
     if (array_key_exists($keys[0], $arr)) {
         $this->setArticleId($arr[$keys[0]]);
     }
     if (array_key_exists($keys[1], $arr)) {
         $this->setAuthorId($arr[$keys[1]]);
     }
 }