Styjun

I have subclassed QStandardItemModel and want to link it with TableView in QML. But data from QStandardItemModel is not visible in TableView.

With role set to "display" in tableview I am able to see first column so I have re-implemented roleNames() function in my class but still no success.
I am not sure how to link roleNames enum with column in QStandardItemModel?

class AuditLogsModel : public QStandardItemModel
{
 Q_OBJECT
 QList<QStandardItem*> row;
public:
 enum AuditRoles
 
 DateTimeRole = Qt::UserRole + 1,
 UsernameRole,
 ApplicationRole,
 CategoryRole,
 DescriptionRole
 ;
...

Implementation (C++) source

AuditLogsModel::AuditLogsModel(QObject *parent)
 : QStandardItemModel(parent)

 row.clear();
 loadData();
 setColumnMapping();


void AuditLogsModel::setColumnMapping()

 setData(index(0,0), "DateTime", AuditRoles::DateTimeRole);
 setData(index(0,1), "Name", AuditRoles::UsernameRole);
 setData(index(0,2), "Application", AuditRoles::ApplicationRole);
 setData(index(0,3), "Category", AuditRoles::CategoryRole);
 setData(index(0,4), "Description", AuditRoles::DescriptionRole);


QHash<int, QByteArray> AuditLogsModel::roleNames() const

 QHash<int, QByteArray> roleNameMap;
 roleNameMap[DateTimeRole] = "DateTime";
 roleNameMap[UsernameRole] = "Name";
 roleNameMap[ApplicationRole] = "Application";
 roleNameMap[CategoryRole] = "Category";
 roleNameMap[DescriptionRole] = "Description";

 return roleNameMap;


void AuditLogsModel::loadData()

 QFile file(AUDIT_LOG_PATH);
 if( file.exists() == false )
 
 syslog(LOG_ERR,qPrintable(QString("Audit log file: %1 does not exist").arg(AUDIT_LOG_PATH)));
 return;
 

 if (file.open(QIODevice::ReadOnly))
 
 QTextStream in(&file);

 QString line;
 QJsonObject logEntry;
 while(!in.atEnd()) 

 line = in.readLine();
 logEntry = (QJsonDocument::fromJson(line.toStdString().c_str())).object();

 row.append(new QStandardItem(logEntry["Date-time"].toString()));
 row.append(new QStandardItem(logEntry["username"].toString()));
 row.append(new QStandardItem(logEntry["App_name"].toString()));
 row.append(new QStandardItem(logEntry["event_category"].toString()));
 row.append(new QStandardItem(logEntry["event_desc"].toString()));

 appendRow(row);
 row.clear();
 
 file.close();
 

QML code

 TableView 
 id: auditLogTable
 [geometry] 
 model: auditLogModelObj

 TableViewColumn 
 role: "DateTime"
 title: qsTr("Local Time")
 width: auditLogTable.width * 0.15
 

 TableViewColumn 
 role: "Name"
 title: qsTr("Created By")
 width: auditLogTable.width * 0.1
 

 TableViewColumn 
 role: "Application"
 title: qsTr("app name")
 width: auditLogTable.width * 0.40
 

 TableViewColumn 
 role: "Category"
 title: qsTr("Category")
 width: auditLogTable.width * 0.2
 

 TableViewColumn 
 role: "Description"
 title: qsTr("Detail")
 width: auditLogTable.width * 0.40
 
 

I do not understand what you tried to do in setColumnMapping(), and you do not need to use roleNames() either. In addition, the TableView that you use only accepts model of list type, in this case the roles will be the columns, considering that the solution is:

*.h

class AuditLogsModel : public QStandardItemModel

public:
 enum AuditRoles
 DateTimeRole = Qt::UserRole + 1,
 UsernameRole,
 ApplicationRole,
 CategoryRole,
 DescriptionRole
 ;
 AuditLogsModel(QObject *parent=nullptr);
 void loadData();
;

*.cpp

AuditLogsModel::AuditLogsModel(QObject *parent):
 QStandardItemModel(parent)

 QHash<int, QByteArray> roles;
 roles[DateTimeRole] = "DateTime";
 roles[UsernameRole] = "Name";
 roles[ApplicationRole] = "Application";
 roles[CategoryRole] = "Category";
 roles[DescriptionRole] = "Description";
 setItemRoleNames(roles);


void AuditLogsModel::loadData()

 QFile file(AUDIT_LOG_PATH);
 if(!file.exists() )
 
 syslog(LOG_ERR,qPrintable(QString("Audit log file: %1 does not exist").arg(AUDIT_LOG_PATH)));
 return;
 

 if (file.open(QIODevice::ReadOnly))
 
 QTextStream in(&file);
 QString line;
 QJsonObject logEntry;
 while(!in.atEnd()) 
 QStandardItem *row = new QStandardItem;
 line = in.readLine();
 logEntry = (QJsonDocument::fromJson (line.toStdString().c_str())).object();
 row->setData(logEntry["Date-time"].toString(), DateTimeRole);
 row->setData(logEntry["username"].toString(), UsernameRole);
 row->setData(logEntry["App_name"].toString(), ApplicationRole);
 row->setData(logEntry["event_category"].toString(), CategoryRole);
 row->setData(logEntry["event_desc"].toString(), DescriptionRole);
 appendRow(row);
 
 file.close();