Doctrine – A new entity was found through the relationship

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I had the same problem and it was the same EntityManager. I wanted to insert an object related ManyToOne. And I don’t want a cascade persist.

Example : 

$category = $em->find("Category", 10);

$product = new Product();
$product->setCategory($category)

$em->persist($product);
$em->flush();

This throws the same exception for me.

So the solution is :

$category = $em->find("Category", 10);

$product = new Product();
$product->setCategory($category)

$em->merge($product);
$em->flush();

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