Doctrine2 query orderBy with specific values first - php

Question

I am trying to apply several filters to one dql in Symfony using Doctrine. I want order it by several columns (although for the moment I am having problems just with one column) and I want show first values that matches with specific values. I will write a simple example to illustrate it about the result that I am searching:
col1 col1
---- -----
A B
B => A
C C
W W
I was searching information about how to make it but I am a bit confused due to that some people says that I can't do it directly, other people says that it is possible using case when or if/else. I tried to use case when but without success. The code that I am using is the following:
Updated code and error
$query = $this->createQueryBuilder('article')
->where('article.title LIKE :article')
->setParameter('title', '%'.$term.'%')
->addSelect('(CASE WHEN article.to = \'WOR\' THEN 1 ELSE 0 END) AS to')
->addOrderBy('article.to', 'ASC')
->getQuery();
And if I want set the "B" value as parameter, should I use setParameter after the addSelect?
Right now with the abovecode I am getting the following error:
Key "title" for array with keys "0, to" does not exist in result.html.twig at line 177.
Information related about how I call this method into my controller and pass it to twig template:
$prodMan = $this->get('app.article.manager');
$articles = $prodMan->getResults((string)"t", $page);
$limit = 50;
$maxPages = ceil($articles->count() / $limit);
$thisPage = $page;
return $this->render('result.html.twig', compact('categories', 'maxPages', 'thisPage', 'articles', 'images'));
And the twig template where I have the error:
<td><p>{{articles.title}}></p></td>
Result of {{ dump(articles) }}
Paginator {#475 ▼
-query: Query {#484 ▼
-_state: 2
-_dql: "SELECT article, (CASE WHEN article.to = 'WOR' THEN 1 ELSE 0 END) AS to FROM AppBundle\Entity\Article article WHERE article.title LIKE :title ORDER BY article.to ASC"
-_parserResult: null
-_firstResult: 0
-_maxResults: 50
-_queryCache: null
-_expireQueryCache: false
-_queryCacheTTL: null
-_useQueryCache: true
#parameters: ArrayCollection {#483 ▼
-elements: array:1 [▼
0 => Parameter {#480 ▼
-name: "title"
-value: "%t%"
-type: 2
}
]
}
#_resultSetMapping: null
#_em: EntityManager {#105 …10}
#_hints: []
#_hydrationMode: 1
#_queryCacheProfile: null
#_expireResultCache: false
#_hydrationCacheProfile: null
}
-fetchJoinCollection: true
-useOutputWalkers: null
-count: 143
}
I executed the same dql query without the case when (with that dql I haven't any problem), and I compare the dumps in Twig and the only difference that I see is that in the other dql I am getting #483 and #482 indexes instead of #484 and #480 respectly
And I can't var_dump any position of the array, but the array has the right number of results, although I can't check if results are sorted in the right way
I am stuck with this problem and if someone could lead me to the right answer I'd be very grateful!

Answer 1

I'm not sure if your query will work, but what if you change this line like so:
->addSelect('(CASE WHEN article.to = \'B\' THEN 1 ELSE 0 END) AS HIDDEN to')
Escaping the quote, or:
->addSelect("(CASE WHEN article.to = 'B' THEN 1 ELSE 0 END) AS HIDDEN to")
That way the B is in quote. Again, not sure about the query itself.
EDIT #2 - Based on dump of articles
Looks like the dump is still a query.
You need to get the results like so:
$articles = $query->getResult();
Then pass the articles to you twig and render it.
Normally done like so:
return $this->render('result.html.twig', array(
'articles' => $articles,
));
See if that works.
You might need changes, but the above code gives you some idea of what to do.