View model for nested structure with list (QAbstractListModel, QAbstractItemModel)

[asersoft]

Hello!
I have the following structures:

struct Topic {
  QString name;
  bool    available;
  bool    operator==(const Topic& other) const {
    return name == other.name && available == other.available;
  }
};

struct Lesson {
  QString      name;
  QString      description;
  QList<Topic> topics;

  bool operator==(const Lesson& other) const {
    return name == other.name && description == other.description && topics == other.topics;
  }
};

In QML I have 2 views, the first one would display lesson, description and would also contain another, nested view, which would display list of topics. Something like this:

StackLayout {
    Repeater {
        model: LessonModel {
        }
        delegate: LessonDelegate {
            name: model.name
            description: model.description
            // topics: model.topics ??? <- topics is model for inner TopicModel?
        }
    }
}

I'm not really sure how could I achieve that. Until now, I used QAbstractListModel and it was perfectly fine, but for this example looks like this is not enough. I think that maybe QAbstractItemModel could help me, but I'm not sure how could use that in my case?

[chids]

hi i have a similiar problem, did you end up solving this?

[SuhasKrishanamurthy]

Yes, in this case, you need a hierarchical model since a Lesson contains multiple Topics. The QAbstractListModel is not sufficient because it only supports a flat list. Instead, you should use QAbstractItemModel to represent the hierarchical data structure.