Sort a doctrine's #OneToMany ArrayCollection by field - symfony

Question

Close question was enter link description here but I need to more deep sorting:
/**
* #var ArrayCollection[SubjectTag]
*
* #ORM\OneToMany(targetEntity="SubjectTag", mappedBy="subject")
* #ORM\OrderBy({"position" = "ASC"})
* #Assert\Valid()
*/
protected $subjectTags;
In subjectTag I have:
/**
* #var ArrayCollection[tag]
*
* #ORM\OneToMany(targetEntity="Tag", mappedBy="subject")
* #ORM\OrderBy({"name" = "ASC"})
* #Assert\Valid()
*/
protected $tags;
Now I want to sort by SubjectTag.tags. How can I do that?
EDIT:
Entity1.php:
/**
* #ORM\ManyToOne(targetEntity="Entity2", referencedColumnName="id", nullable=false)
* #Assert\Valid()
*/
protected $entity2;
Entity2.php:
/**
* #ORM\ManyToOne(targetEntity="Entity3", referencedColumnName="id", nullable=false)
* #Assert\Valid()
*/
protected $entity3;
Entity3.php:
/**
* #ORM\Column(type="integer", nullable=true)
*/
protected $position;
And now.. I want have in Entity1 Entity2 sorted by position. How can I do that by default?

Answer 1

As explained in my previous comment, you should do a custom query in your repository class corresponding to your base Entity (You didn't give the name of it).
So in your App\Repository\"YourBaseENtityName"Repository class, you do something like this.
public function findOrderByTags()
{
return $this
->createQueryBuilder('baseEntityAlias')
->addSelect('st')
->addSelect('t')
->leftJoin('baseEntityAlias.subjectTags', 'st')
->leftJoin('st.tags', 't')
->orderBy('st.position', 'ASC')
->addOrderBy('t.name', 'ASC')
->getQuery()
->getResult();
}
Moreover, I'm not sure about what kind of order you want to perform based on your question. Here the baseEntity->subjectTags will be ordered by their positions and then the baseEntity->subjectTags->tags will be ordered by name.
Now you can call this method from your base entity repository class
Hope it will be helpful for you.
EDIT:
Here is a way to introduce a default behavior for your queryBuilder and reuse it.
/**
* In your EntityRepository add a method to init your query builder
*/
public function createDefaultQueryBuilder(string $alias = 'a')
{
return $this
->createQueryBuilder($alias)
->addSelect('st')
->addSelect('t')
->leftJoin('baseEntityAlias.subjectTags', 'st')
->leftJoin('st.tags', 't')
->orderBy('st.position', 'ASC')
->addOrderBy('t.name', 'ASC');
}
/**
* In this example, I override the default find method. I don't recommend it thought
*/
public function find($id, $lockMode = null, $lockVersion = null)
{
return $this
->createDefaultQueryBuilder()
->where('a.id = :id')
->setParameter('id', $id)
->getQuery()
->getOneOrNullResult();
}
As you can see, I reuse the createDefaultQueryBuilder method in order to get a default behavior with subjectTags and tags init in the relation and ordered in the right way.