Doctrine Cascade Options for OneToMany

Question

I\'m having a hard time making sense of the Doctrine manual\'s explanation of cascade operations and need someone to help me understand the options in terms of a simple Many

Answer 1

If you have a @OneToMany unidirectional association, like that described in section 6.10 of the Doctrine Reference, then most likely you forgot to persist the Topic before calling flush. Don't set the topic_id primary key in Article. Instead set the Topic instance.

For example, given Article and Topic entities like these:

text = $text;
    }
 }
 public function setArticle($text)
 {
     $this->text = $text;
 }

 public function setTopic(Topic $t)
{
     $this->topic = $t;
}
} 

id;}
}

After you generate the schema:

# doctrine orm:schema-tool:create

your code to persist these entities would look like something this

//configuration omitted..
$em = \Doctrine\ORM\EntityManager::create($connectionOptions, $config);

$topic = new Entities\Topic();
$article1 = new Entities\Article("article 1");
$article2 = new Entities\Article("article 2");
$article1->setTopic($topic);
$article2->setTopic($topic);
$em->persist($article1);
$em->persist($article2);
$em->persist($topic);

try {
    $em->flush();
} catch(Exception $e) {
    $msg= $e->getMessage();
    echo $msg . "
\n";
}
return;

I hope this helps.