Can a Model be a child and a parent at the same time?

[Frank Wikström]

I realize this might not the best database design, but I wonder if your package could doing something with this?

I have a database with the following simplified tables:

questions
type

answers
question_id
subtype

and relationships

Question::hasOne(Answer)
Answer::belongsTo(Question)

I.e. questions can have several types, and each specific type of question has a subtype via the subtype field on Answer. The subtypes are only unique within a question type.

I was trying to setup a hierarchy of sti classes like:

class Question extends Model {
    use HasChildren;

    protected $childTypes = [
        1 => MultipleChoiceQuestion::class,
        2 => NumberQuestion::class,
        ...
    ];
}

class NumberQuestion extends Question 
{
    use HasParent;

    public function answer()
    {
        return $this->hasOne(NumberAnswer::class);
    }
}

class Answer extends Model {
    use HasChildren;
}

class NumberAnswer extends Answer {
    use HasParent;
    user HasChildren;

    protected $childColumn = 'subtype';
    protected $childTypes = [
        1 => NumberVariant1::class,
        2 => NumberVariant2::class,
        ...
    ];
}

class NumberVariant1 extends NumberAnswer 
{
    use HasParent;
}

However, this fails, since both HasParent and HasChildren contain conflicting getClassNameForRelationships methods. Is there a way to do this, or something similar without changing the database layout?

[Frank Wikström]

I found a way to make it work, put explicit column names in Answer and remove the HasChildren, HasParent relation between Answer and AnswerNumber did the trick.