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diff --git a/examples/declarative/editingmodel/model.py b/examples/declarative/editingmodel/model.py
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+#############################################################################
+##
+## Copyright (C) 2021 The Qt Company Ltd.
+## Contact: http://www.qt.io/licensing/
+##
+## This file is part of the Qt for Python examples of the Qt Toolkit.
+##
+## $QT_BEGIN_LICENSE:BSD$
+## You may use this file under the terms of the BSD license as follows:
+##
+## "Redistribution and use in source and binary forms, with or without
+## modification, are permitted provided that the following conditions are
+## met:
+##   * Redistributions of source code must retain the above copyright
+##     notice, this list of conditions and the following disclaimer.
+##   * Redistributions in binary form must reproduce the above copyright
+##     notice, this list of conditions and the following disclaimer in
+##     the documentation and/or other materials provided with the
+##     distribution.
+##   * Neither the name of The Qt Company Ltd nor the names of its
+##     contributors may be used to endorse or promote products derived
+##     from this software without specific prior written permission.
+##
+##
+## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+
+from PySide6.QtCore import (QAbstractListModel, QByteArray, QModelIndex, Qt,
+                            Slot)
+from PySide6.QtGui import QColor
+
+
+class BaseModel(QAbstractListModel):
+
+    RatioRole = Qt.UserRole + 1
+
+    def __init__(self, parent=None):
+        super().__init__(parent=parent)
+        self.db = []
+
+    def rowCount(self, parent=QModelIndex()):
+        return len(self.db)
+
+    def roleNames(self):
+        default = super().roleNames()
+        default[self.RatioRole] = QByteArray(b"ratio")
+        default[Qt.BackgroundRole] = QByteArray(b"backgroundColor")
+        return default
+
+    def data(self, index, role: int):
+        if not self.db:
+            ret = None
+        elif not index.isValid():
+            ret = None
+        elif role == Qt.DisplayRole:
+            ret = self.db[index.row()]["text"]
+        elif role == Qt.BackgroundRole:
+            ret = self.db[index.row()]["bgColor"]
+        elif role == self.RatioRole:
+            ret = self.db[index.row()]["ratio"]
+        else:
+            ret = None
+        return ret
+
+    def setData(self, index, value, role):
+        if not index.isValid():
+            return False
+        if role == Qt.EditRole:
+            self.db[index.row()]["text"] = value
+        return True
+
+    @Slot(result=bool)
+    def append(self):
+        """Slot to append a row at the end"""
+        return self.insertRow(self.rowCount())
+
+    def insertRow(self, row):
+        """Insert a single row at row"""
+        return self.insertRows(row, 0)
+
+    def insertRows(self, row: int, count, index=QModelIndex()):
+        """Insert n rows (n = 1 + count)  at row"""
+
+        self.beginInsertRows(QModelIndex(), row, row + count)
+
+        # start database work
+        if len(self.db):
+            newid = max(x["id"] for x in self.db) + 1
+        else:
+            newid = 1
+        for i in range(count + 1):  # at least one row
+            self.db.insert(
+                row, {"id": newid, "text": "new", "bgColor": QColor("purple"), "ratio": 0.2}
+            )
+        # end database work
+        self.endInsertRows()
+        return True
+
+    @Slot(int, int, result=bool)
+    def move(self, source: int, target: int):
+        """Slot to move a single row from source to target"""
+        return self.moveRow(QModelIndex(), source, QModelIndex(), target)
+
+    def moveRow(self, sourceParent, sourceRow, dstParent, dstChild):
+        """Move a single row"""
+        return self.moveRows(sourceParent, sourceRow, 0, dstParent, dstChild)
+
+    def moveRows(self, sourceParent, sourceRow, count, dstParent, dstChild):
+        """Move n rows (n=1+ count)  from sourceRow to dstChild"""
+
+        if sourceRow == dstChild:
+            return False
+
+        elif sourceRow > dstChild:
+            end = dstChild
+
+        else:
+            end = dstChild + 1
+
+        self.beginMoveRows(QModelIndex(), sourceRow, sourceRow + count, QModelIndex(), end)
+
+        # start database work
+        pops = self.db[sourceRow : sourceRow + count + 1]
+        if sourceRow > dstChild:
+            self.db = (
+                self.db[:dstChild]
+                + pops
+                + self.db[dstChild:sourceRow]
+                + self.db[sourceRow + count + 1 :]
+            )
+        else:
+            start = self.db[:sourceRow]
+            middle = self.db[dstChild : dstChild + 1]
+            endlist = self.db[dstChild + count + 1 :]
+            self.db = start + middle + pops + endlist
+        # end database work
+
+        self.endMoveRows()
+        return True
+
+    @Slot(int, result=bool)
+    def remove(self, row: int):
+        """Slot to remove one row"""
+        return self.removeRow(row)
+
+    def removeRow(self, row, parent=QModelIndex()):
+        """Remove one row at index row"""
+        return self.removeRows(row, 0, parent)
+
+    def removeRows(self, row: int, count: int, parent=QModelIndex()):
+        """Remove n rows (n=1+count) starting at row"""
+        self.beginRemoveRows(QModelIndex(), row, row + count)
+
+        # start database work
+        self.db = self.db[:row] + self.db[row + count + 1 :]
+        # end database work
+
+        self.endRemoveRows()
+        return True
+
+    @Slot(result=bool)
+    def reset(self):
+        self.beginResetModel()
+        self.resetInternalData()  # should work without calling it ?
+        self.endResetModel()
+        return True
+
+    def resetInternalData(self):
+        self.db = [
+            {"id": 3, "bgColor": QColor("red"), "ratio": 0.15, "text": "first"},
+            {"id": 1, "bgColor": QColor("blue"), "ratio": 0.1, "text": "second"},
+            {"id": 2, "bgColor": QColor("green"), "ratio": 0.2, "text": "third"},
+        ]