Can Doctrine2 #OrderBy a calculated field? - doctrine-orm

Question

I want to sort my model's associated ArrayCollection with a quotient, like this (I know the following code doesn't work):
/**
* #OneToMany (targetEntity="Review", mappedBy="product")
* #OrderBy ({"voted_up / voted_down" = "DESC"})
*/
protected $reviews;
Is something this possible directly in the model definition or do I need to simply use a sort() on the ArrayCollection when requesting the data?

Answer 1

With Doctrine 2.1 you can do that directly in the model definition, but not with #OrderBy. You can define DQL snippets at model level, like stated in the 2.1 Beta release notes:
Named DQL Queries in Metadata: You can add dql queries in the mapping files using #NamedQueries(#NamedQuery(name="foo", query="DQL")) and access them through $em->getRepository()->getNamedQuery().
As such you can create your DQL query with the ORDER BY keywords, something like:
SELECT c.id, c.text, (c.voted_up / c.voted_down) AS sortkey FROM Comment c
ORDER BY sortkey DESC
So, I imagine you add this annotation to the model definition, something like:
/**
* #Entity
* #Table(name="comment")
* #NamedQueries(#NamedQuery(name="sortedComment", query="SELECT c.id, c.text, (c.voted_up / c.voted_down) AS sortkey FROM Comment c ORDER BY sortkey DESC"))
*/
class Comment {
...
}
And then on your code call:
$em->getRepository("Comment")->getNamedQuery("sortedComment");
I didn't test this, but you get the idea.