How to access data of QSqlQueryModel from a QML ListView delegate? - qt

Question

I want to access data by a query in SQL database and present its results as list of elements in QML. However, I'm not sure if I'm accessing this data in the right way. Or maybe QSqlQueryModel presents its data in unusual way? How can I check this?
Here's code from my QML file:
import QtQuick 2.0
import QtQuick.Controls 2.1
import QtQuick.Window 2.1
import QtQuick.Layouts 2.0
import QtQml.Models 2.3
import DbInterface 1.0
ApplicationWindow {
id: main
width: 400
height: 800
visible: true
Component {
id: appCentralListDelegate
Row {
Text {
text: signature
}
Text {
text: name
}
}
}
DbInterface { id: appCentralListModel }
DelegateModel {
id: delegateModel
property var isSearchResult: function(item) {
return true;
// not implemented yet
}
model: appCentralListModel
delegate: appCentralListDelegate
function update() {
console.log("Starting update");
if (items.count > 0) {
items.setGroups(0, items.count, "items");
}
// Step 1: Filter items
var visible = [];
for (var i = 0; i < items.count; ++i) {
var item = items.get(i);
if (isSearchResult(item.model)) {
visible.push(item);
}
}
// Step 3: Add all items to the visible group:
for (i = 0; i < visible.length; ++i) {
item = visible[i];
item.inVisible = true;
if (item.visibleIndex !== i) {
visibleItems.move(item.visibleIndex, i, 1);
}
}
}
items.onChanged: update()
onIsSearchResultChanged: update()
groups: DelegateModelGroup {
id: visibleItems
name: "visible"
includeByDefault: false
}
filterOnGroup: "visible"
}
ListView {
id: appCentralListView
anchors.fill: parent
model: delegateModel
spacing: 0
}
Row {
TextField {
id: searchField
}
}
}
And here is a file where DbInterface is presented:
from PySide6.QtSql import QSqlQueryModel
from PySide6.QtQml import QmlElement
QML_IMPORT_NAME = "DbInterface"
QML_IMPORT_MAJOR_VERSION = 1
#QmlElement
class DbInterface(QSqlQueryModel):
def __init__(self, parent=None):
super(DbInterface, self).__init__(parent)
self.setQuery(open("query.sql").read())
if self.lastError().isValid:
print(self.lastError())
else:
print("Query executed successfully.")