Details
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Bug
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Resolution: Incomplete
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P2: Important
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None
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5.13.1
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None
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Windows
Description
I have a @dataclass that contains a list of attributes I want to display in my UI using QML. However, when it tries to display information it will say undefined. I am using PySide2 version 5.13.1. I have attached example code to reproduce the issue. Coming from being used to using Qt with C++, I would traditionally do something like Q_DECLARE_METATYPE to make my custom type available as a QVariant but a PySide2 equivalent doesn't seem to exist.
main.py
import sys from PySide2.QtCore import QUrl from PySide2.QtQml import QQmlApplicationEngine, qmlRegisterType from PySide2.QtWidgets import QApplication from information_item import InformationItem import qml_rc if __name__ == "__main__": app = QApplication(sys.argv) qmlRegisterType(InformationItem, "InformationItem", 1, 0, "InformationItem") engine = QQmlApplicationEngine() engine.load(QUrl("qrc:/main.qml")) if not engine.rootObjects(): sys.exit(-1) sys.exit(app.exec_())
information.py
from typing import List from dataclasses import dataclass, field @dataclass class Information: first_name: str = "" last_name: str = "" phone_numbers: List[str] = field(default_factory=list)
information_item.py
from typing import List from PySide2.QtCore import Property from PySide2.QtQuick import QQuickItem from information import Information class InformationItem(QQuickItem): def __init__(self, parent: QQuickItem = None) -> None: super().__init__(parent) self._information = Information("John", "Doe", ["(123) 456-7890", "(321) 654-0987"]) @Property("QVariant", constant=True) def information(self) -> Information: print(f"INFORMATION: {self._information.first_name} {self._information.last_name} {self._information.phone_numbers[0]} {self._information.phone_numbers[1]}") return self._information
main.qml
import QtQuick 2.13 import QtQuick.Controls 2.13 ApplicationWindow { width: 500 height: 500 visible: true InformationItem { anchors.fill: parent } }
InformationItem.qml
import QtQuick 2.13 import InformationItem 1.0 InformationItem { id: informationItem anchors.fill: parent Column { Text { text: "First Name " + informationItem.information.first_name } Text { text: "Last Name " + informationItem.information.last_name } Text { text: "Phone Number 1 " + informationItem.information.phone_numbers[0] } Text { text: "Phone Number 2 " + informationItem.information.phone_numbers[1] } } Component.onCompleted: { console.log("informationItem.information: " + informationItem.information) } }
I build and run my program like so:
$ pipenv install $ pipenv run pyside2-rcc -o qml_rc.py qml.qrc $ pipenv run python main.py
Output:
INFORMATION: John Doe (123) 456-7890 (321) 654-0987 INFORMATION: John Doe (123) 456-7890 (321) 654-0987 INFORMATION: John Doe (123) 456-7890 (321) 654-0987 INFORMATION: John Doe (123) 456-7890 (321) 654-0987 INFORMATION: John Doe (123) 456-7890 (321) 654-0987 qml: informationItem.information: QVariant(PySide::PyObjectWrapper, ) qrc:/InformationItem.qml:19: TypeError: Cannot read property '0' of undefined qrc:/InformationItem.qml:23: TypeError: Cannot read property '1' of undefined
