I'm not sure that 'Bug' is the most fitting issue type. I was advised to submit per this qt forum post: https://forum.qt.io/topic/146598/deprecationwarning-qsqlquerymodel-setquery

I am trying to set a QSqlQueryModel to a QSqlQuery object. I'm using a query object rather than a string because I need the query to be parameterized, I need to prepare and bind values to the query. Here is example code:
 

    def requery(self, parent_id):
        q = QSqlQuery()
        q.prepare("""
            SELECT id, some_field, parent_id
            FROM child_table
            WHERE parent_id=?
        """)
        q.addBindValue(parent_id)
        q.exec()
        self._model.setQuery(q)

Doing so produces the following warning:
DeprecationWarning: Function: 'QSqlQueryModel.setQuery(const QSqlQuery & query)' is marked as deprecated, please check the documentation for more information.