Treemodel transformation

[D0IT]

Hello,

I'm having huge difficulties getting the following to work:
I have a QAIM subclass that takes a variable amount of QSqlQueryModel and models them into a tree (every QSqlQueryModel is simply a new tree level).
I'm now having a tree like this (not exactly this, but just to give you an idea):
Job data

• Person data
  -- More specific person data
  everything from separate SQL tables.

What I want to achieve is that data from some specified columns of the different level will be displayed as a child node in a new single row, so that you e.g. just see the person name as a sub note of the job and not all the information in several columns.

I've started to subclass a QSortFilterProxyModel (since the final tree should be filter-/searchable), but am really stuck as to how to achieve this. The columnCount and rowCount functions are already implemented. But I don't see what exactly the other functions shall do / which of them I'll need to implement.

If anyone has any input or examples / open source projects with comparable functionality I would really appreciate it.

Thanks and kind regards,
Robert