Repeater cannot be used to add LineSeries to a GraphsView. LineSeries is not a visual Item (not a QML Item), and GraphsView does not process its QML children. As a result, series created by Repeater are either never instantiated correctly or never registered with the graph. The correct solution is to use Instantiator and explicitly call GraphsView.addSeries(). Instantiator is intended for exactly this case: creating non-visual objects and manually attaching them. Your code below is the correct and supported approach: import QtQuick import QtQuick.Controls.Basic import QtQuick.Controls 6.5 import QtGraphs import Qt.labs.qmlmodels Item { id: processPlot property var model: TableModel { id: seriesModel TableModelColumn { display: "time" } TableModelColumn { display: "raw_pressure" } TableModelColumn { display: "filtered_pressure" } TableModelColumn { display: "raw_position" } TableModelColumn { display: "filtered_position" } TableModelColumn { display: "raw_speed" } TableModelColumn { display: "filtered_speed" } rows: [ { time: 0, raw_pressure: 0, filtered_pressure: 0, raw_position: 240000, filtered_position: 240000, raw_speed: 0, filtered_speed: 0, }, { time: 10, raw_pressure: 5, filtered_pressure: 4, raw_position: 240400, filtered_position: 240400, raw_speed: 20, filtered_speed: 18, }, { time: 20, raw_pressure: 10, filtered_pressure: 9, raw_position: 241000, filtered_position: 241000, raw_speed: 20, filtered_speed: 19, } ] } GraphsView { id: graphsView anchors.fill: parent axisX: ValueAxis { max: 100 } axisY: ValueAxis {} } Instantiator { model: 6 Component.onCompleted: { console.log("Repeater completed"); } delegate: LineSeries { id: series Component.onCompleted: { console.log("Repeated item completed"); graphsView.addSeries(series); } XYModelMapper { model: processPlot.model series: series xSection: 0 ySection: index + 1 } Component.onDestruction: graphsView.removeSeries(series) } } }

You can add custom functions to e.g. bulk-add data to the model but must not forget the call the appropriate changed signals. This is a common way of adding data since it's to slow through setData() when a lot of stuff is changing.

@ChrisW67 oh my god... Yes that was it thank you 😂

Ok, so I figured it out, you make a property and bind the role to this property: property var stockPanic: IsStockBelowThreashold And then you can do: onStockPanicChanged:{ functionThatChangesWhateverYouWant(); }

@overlord said in Using QAbstractItemModel in Models that haven't any list.: I am invastigating proper way to use model/view pattern. The model/view pattern in Qt is designed for cases where you have an arbitrary number of rows of data. Your sensors don't quite match this use-case. Therefore, the model/view pattern is not suitable for your sensors. I suggest you choose the right tool for the job: Just use a data structure for your sensors, like @SGaist suggested. If you want to investigate how to use the model/view pattern, try implementing a model with rows. For example, an address book.

@raven-worx Many thanks! ModelTest did help. I resloved all Q_ASSERT and model updates fine!) You saved me many nights. Posting code which works fine: #include "StickerModel.hpp" #include <QDebug> #include "tdlibQt/TdlibJsonWrapper.hpp" #include "tdlibQt/ParseObject.hpp" namespace tdlibQt { StickerModel::StickerModel(QObject *parent) : QAbstractItemModel(parent), m_client(TdlibJsonWrapper::instance()) { rootSet = QSharedPointer<stickerSet>(new stickerSet); connect(m_client, &TdlibJsonWrapper::stickerSetReceived, this, &StickerModel::addStickerSet); //BUG? Lambda functions requires disconnection before dectruction?. Even disconnection doesnt help connect(m_client, &TdlibJsonWrapper::stickerSetsReceived, this, &StickerModel::stickersSetsReceived); connect(m_client, &TdlibJsonWrapper::stickersReceived, this, &StickerModel::stickersReceived); connect(m_client, &TdlibJsonWrapper::updateFile, this, &StickerModel::updateFile); connect(this, &StickerModel::downloadFileStart, this, &StickerModel::getFile); } StickerModel::~StickerModel() { m_stikerSets.clear(); m_installedStickerSets.clear(); } void StickerModel::getAttachedStickerSets(const int file_id) { m_client->getAttachedStickerSets(file_id); } void StickerModel::getStickerSet(const qint64 set_id) { m_client->getStickerSet(set_id); } void StickerModel::getFavoriteStickers() { m_client->getFavoriteStickers(); } void StickerModel::getRecentStickers() { m_client->getRecentStickers(); } void StickerModel::getInstalledStickers(const bool is_masks) { m_client->getInstalledStickerSets(is_masks); } void StickerModel::addTrendingStickerSets(const QJsonObject &stickerSetsObject) { auto stickerSetsObj = ParseObject::parseStickerSets(stickerSetsObject); for (QSharedPointer<stickerSetInfo> val : stickerSetsObj->sets_) m_trendingStickerSets.append(val); } QSharedPointer<stickerSet> StickerModel::createStickerSet(const QString &name, const QString &title, const std::vector<QSharedPointer<sticker> > &stickers) { if (stickers.size() == 0) return QSharedPointer<stickerSet>(nullptr); QSharedPointer<stickerSet> resultSet = QSharedPointer<stickerSet>(new stickerSet); resultSet->name_ = name.toStdString(); resultSet->title_ = title.toStdString(); resultSet->stickers_ = stickers; return resultSet; } StickerModel::StickerModelState StickerModel::modelState() const { return m_state; } QHash<int, QByteArray> StickerModel::roleNames() const { QHash<int, QByteArray> roles; roles[ID] = "id"; roles[IS_ARCHIVED] = "is_archived"; roles[IS_INSTALLED] = "is_installed"; roles[IS_MASKS] = "is_masks"; roles[IS_OFFICIAL] = "is_official"; roles[IS_VIEWED] = "is_viewed"; roles[TITLE] = "title"; roles[NAME] = "name"; roles[STICKER] = "sticker"; roles[EMOJI] = "emoji"; roles[STICKERS_COUNT] = "stickers_count"; roles[SET_STICKER_THUMBNAIL] = "set_thumbnail"; roles[STICKER_FILE_ID] = "sticker_file_id"; return roles; } QVariant StickerModel::data(const QModelIndex &index, int role) const { if (!index.isValid()) return QVariant(); if (index.row() < 0) return QVariant(); stickerSet *childItem = static_cast<stickerSet *>(index.internalPointer()); if (!childItem) return QVariant(); int rowIndex = index.row(); int setNumber = 0;//index.parent().column() == 0 ? index.parent().row() : rowIndex;//getSetIndex(rowIndex); if (childItem == rootSet.data()) { setNumber = index.row(); rowIndex = index.row(); } else { setNumber = index.parent().row(); rowIndex = index.row(); } switch (role) { case ID: return QString::number(m_stikerSets[setNumber]->id_); case IS_ARCHIVED: return m_stikerSets[setNumber]->is_archived_; case IS_INSTALLED: return m_stikerSets[setNumber]->is_installed_; case IS_MASKS: return m_stikerSets[setNumber]->is_masks_; case IS_OFFICIAL: return m_stikerSets[setNumber]->is_official_; case IS_VIEWED: return m_stikerSets[setNumber]->is_viewed_; case TITLE: return QString::fromStdString(m_stikerSets[setNumber]->title_); case NAME: return QString::fromStdString(m_stikerSets[setNumber]->name_); case SET_STICKER_THUMBNAIL: return QString::fromStdString(m_stikerSets[setNumber]->stickers_[0]->sticker_->local_->path_); case STICKERS_COUNT: return m_stikerSets[setNumber]->stickers_.size(); case STICKER: if (index.parent().row() == -1) return QVariant(); // m_installedStickerSets[rowIndex]->covers_; if (m_stikerSets[setNumber]->stickers_[rowIndex]->sticker_->local_->is_downloading_completed_) return QString::fromStdString(m_stikerSets[setNumber]->stickers_[rowIndex]->sticker_->local_->path_); if (m_stikerSets[setNumber]->stickers_[rowIndex]->thumbnail_->photo_->local_->is_downloading_completed_) { emit downloadFileStart(m_stikerSets[setNumber]->stickers_[rowIndex]->sticker_->id_, 12, index); return QString::fromStdString(m_stikerSets[setNumber]->stickers_[rowIndex]->thumbnail_->photo_->local_->path_); } emit downloadFileStart(m_stikerSets[setNumber]->stickers_[rowIndex]->thumbnail_->photo_->id_, 12, index); return QVariant(); case EMOJI: { if (index.parent().row() == -1) return QVariant(); QString emojis = ""; emojis += QString::fromStdString(m_stikerSets[setNumber]->stickers_[rowIndex]->emoji_); return emojis; } break; case STICKER_FILE_ID: if (index.parent().row() == -1) return QVariant(); return m_stikerSets[setNumber]->stickers_[rowIndex]->sticker_->id_; break; default: return QVariant(); break; } // m_installedStickerSets[rowIndex]->id_; // m_installedStickerSets[rowIndex]->is_archived_; // m_installedStickerSets[rowIndex]->is_installed_; // m_installedStickerSets[rowIndex]->is_masks_; // m_installedStickerSets[rowIndex]->is_official_; // m_installedStickerSets[rowIndex]->is_viewed_; // m_installedStickerSets[rowIndex]->name_; // m_installedStickerSets[rowIndex]->title_; } int StickerModel::rowCount(const QModelIndex &parent) const { if (m_state == SendState || m_state == PreviewState) { stickerSet *childItem = static_cast<stickerSet *>(parent.internalPointer()); if (parent == QModelIndex()) return m_stikerSets.size(); if (childItem == rootSet.data()) { return m_stikerSets.at(parent.row())->stickers_.size(); } else return 0; } return 0; } void StickerModel::addInstalledStickerSets(const QJsonObject &stickerSetsObject) { auto stickerSetsObj = ParseObject::parseStickerSets(stickerSetsObject); for (QSharedPointer<stickerSetInfo> val : stickerSetsObj->sets_) { m_installedStickerSets.append(val); if (m_state == SendState) getStickerSet(val->id_); } } void StickerModel::addStickerSet(const QJsonObject &stickerSetObject) { auto stickerSetObj = ParseObject::parseStickerSet(stickerSetObject); if (stickerSetObj.data()) { beginInsertRows(QModelIndex(), m_stikerSets.size(), m_stikerSets.size()); m_stikerSets.append(stickerSetObj); endInsertRows(); } } void StickerModel::updateFile(const QJsonObject &fileObject) { if (fileObject["@type"].toString() == "updateFile") processFile(fileObject["file"].toObject()); } void StickerModel::processFile(const QJsonObject &fileObject) { auto file = ParseObject::parseFile(fileObject); if (m_stickerUpdateQueue.keys().contains(file->id_)) { QVector<int> photoRole; QPersistentModelIndex viewIndex = m_stickerUpdateQueue[file->id_]; qDebug() << viewIndex << "Row" << viewIndex.row() << "Column" << viewIndex.column() << viewIndex.parent().row(); int rowIndex = viewIndex.row(); int setIndex = viewIndex.parent().row(); if (m_stikerSets[setIndex]->stickers_[rowIndex]->sticker_->id_ == file->id_) m_stikerSets[setIndex]->stickers_[rowIndex]->sticker_ = file; if (m_stikerSets[setIndex]->stickers_[rowIndex]->thumbnail_->photo_->id_ == file->id_) m_stikerSets[setIndex]->stickers_[rowIndex]->thumbnail_->photo_ = file; if (file->local_->is_downloading_completed_) { photoRole.append(STICKER); photoRole.append(SET_STICKER_THUMBNAIL); } //For child item emit dataChanged(viewIndex, viewIndex, photoRole); //for thumbnails emit dataChanged(viewIndex.parent(), viewIndex.parent(), photoRole); if (file->local_->is_downloading_completed_) m_stickerUpdateQueue.remove(file->id_); } } void StickerModel::stickersReceived(const QJsonObject &setObject) { if (setObject["@extra"].toString() == "getFavoriteStickers") addFavoriteStickers(setObject); else addRecentStickers(setObject); } void StickerModel::stickersSetsReceived(const QJsonObject &setsObject) { if (setsObject["@extra"].toString() == "getTrendingStickerSets") addTrendingStickerSets(setsObject); else addInstalledStickerSets(setsObject); } void StickerModel::changeStickerSet(const QString &setId, const bool isInstalled, const bool isArchived) { m_client->changeStickerSet(setId.toLongLong(), isInstalled, isArchived); } QVariant StickerModel::getStickerUrl(const int setIndex, const int stickerIndex) { return data(index(stickerIndex, 0, index(setIndex, 0)), DataRoles::STICKER); } QVariant StickerModel::getStickerEmoji(const int setIndex, const int stickerIndex) { return data(index(stickerIndex, 0, index(setIndex, 0)), DataRoles::EMOJI); } QVariant StickerModel::getStickersCount(const int setIndex) { return data(index(setIndex, 0), DataRoles::STICKERS_COUNT); } void StickerModel::setSet_id(QString set_id) { if (m_set_id == set_id) return; m_set_id = set_id; emit set_idChanged(m_set_id); } void StickerModel::getFile(const int fileId, const int priority, const QModelIndex indexItem) { m_client->downloadFile(fileId, priority); m_stickerUpdateQueue[fileId] = indexItem; } int StickerModel::columnCount(const QModelIndex &parent) const { return 1; } QModelIndex StickerModel::index(int row, int column, const QModelIndex &parent) const { if (!hasIndex(row, column, parent)) return QModelIndex(); if (parent.column() > -1) return createIndex(row, column, m_stikerSets.at(parent.row()).data()); return createIndex(row, column, rootSet.data()); } QModelIndex StickerModel::parent(const QModelIndex &child) const { if (!child.isValid()) return QModelIndex(); stickerSet *childItem = static_cast<stickerSet *>(child.internalPointer()); if (!childItem) return QModelIndex(); if (childItem == rootSet.data()) return QModelIndex(); if (child.column() == -1) return QModelIndex(); int rowPosition = 0; for (int i = 0; i < m_stikerSets.size(); i++) if (m_stikerSets.at(i).data() == childItem) { rowPosition = i; break; } return createIndex(rowPosition, 0, rootSet.data()); } bool StickerModel::hasChildren(const QModelIndex &parent) const { if (rowCount(parent) == 0) return false; return true; } QString StickerModel::set_id() const { return m_set_id; } void StickerModel::addFavoriteStickers(const QJsonObject &stickersObject) { auto stickersObj = ParseObject::parseStickers(stickersObject); auto resultSet = createStickerSet("Favorite", tr("Favorite"), stickersObj->stickers_); if (resultSet.data()) { beginInsertRows(QModelIndex(), m_stikerSets.size(), m_stikerSets.size()); m_stikerSets.append(resultSet); endInsertRows(); } } void StickerModel::addRecentStickers(const QJsonObject &stickersObjecct) { auto stickersObj = ParseObject::parseStickers(stickersObjecct); auto resultSet = createStickerSet("Recent", tr("Recent"), stickersObj->stickers_); if (resultSet.data()) { beginInsertRows(QModelIndex(), m_stikerSets.size(), m_stikerSets.size()); m_stikerSets.append(resultSet); endInsertRows(); } } void StickerModel::setModelState(StickerModel::StickerModelState state) { if (m_state == state) return; m_state = state; beginResetModel(); m_stikerSets.clear(); m_installedStickerSets.clear(); endResetModel(); switch (m_state) { case SendState: getFavoriteStickers(); getRecentStickers(); getInstalledStickers(); break; case PreviewState: if (set_id().length() > 0) getStickerSet(set_id().toLongLong()); break; case SettingsState: case TrendingState: default: break; } emit modelStateChanged(m_state); } } //tdlibQt Also, to ensure that ModelTest work, I created rootContext as single model and opened qml page with this model to make ModelTest work. Resolving each seg fault resolved issue

Code would help. And do you see any error messages when your app crashes? Did you try to debug?