c++ - QTableView doesn't show anything -

i trying prototype window qtableview. there isn't yet database behind it, there @ point. can't tableview show anything. rectangle white space. i've looked @ examples online , seem doing right, far can tell.

i set qtableview object gui builder , added following code after call ui.setupui(this);

// set prototype table model hold dummy data qsqltablemodel * model = new qsqltablemodel(this);  model->settable("errors"); model->seteditstrategy(qsqltablemodel::onmanualsubmit); model->select();  // set header names model->setheaderdata(0, qt::horizontal, qobject::tr("error number")); model->setheaderdata(1, qt::horizontal, qobject::tr("message")); model->setheaderdata(2, qt::horizontal, qobject::tr("details"));  // insert dummy record {   qsqlrecord record;   qsqlfield field1("errno", qvariant::int);   field1.setvalue(1);   record.insert(0, field1);    qsqlfield field2("msg", qvariant::string);   field2.setvalue(qstring("unable perform snapshot"));   record.insert(1, field2);    qsqlfield field3("details", qvariant::string);   field3.setvalue(qstring("unable perform snapshot. please try again"));   record.insert(2, field3);    model->insertrecord(0, record); }  // insert dummy record {   qsqlrecord record;   qsqlfield field1("errno", qvariant::int);   field1.setvalue(1);   record.insert(0, field1);    qsqlfield field2("msg", qvariant::string);   field2.setvalue(qstring("unable perform snapshot"));   record.insert(1, field2);    qsqlfield field3("details", qvariant::string);   field3.setvalue(qstring("unable perform snapshot. please try again"));   record.insert(2, field3);    model->insertrecord(1, record); }  ui.errmsgstableview->setedittriggers(qabstractitemview::noedittriggers); ui.errmsgstableview->setmodel(model);  ui.errmsgstableview->show(); 

anyone have suggestions? missing?

you cannot use qsqltablemodel without database. quick workaround, connect temporary in-memory sqlite table literally can created in 2 statements. prototyping should use qstandarditemmodel, though. here's complete example:

// https://github.com/kubao/stackoverflown/tree/master/questions/dummymodel-37577922 #include <qtwidgets>  template <typename t> qstandarditem * newitem(const t val) {   auto item = new qstandarditem;   item->setdata(val, qt::displayrole);   return item; }  int main(int argc, char ** argv) {    qapplication app{argc, argv};     qstandarditemmodel model;    model.setcolumncount(3);    model.sethorizontalheaderlabels(qstringlist{"error number", "message", "details"});     auto newrow = []{ return qlist<qstandarditem*>{          newitem(1),          newitem("unable perform snapshot"),          newitem("unable perform snapshot. please try again")};    };    model.appendrow(newrow());    model.appendrow(newrow());     qtableview view;    view.setmodel(&model);    view.show();     return app.exec(); }