I have searched and I have not found any valid solutions to my problem with QSortFilterProxyModel. I am asking in the same line with this thread
 and another one here which where not answered. I need to filter the output on my tableview but also be able to edit the columns however, when QSortFilterProxyModel is called, I loose focus of the comboboxes. Is there a work around on this? Bellow is my code

Qt Code: 
  1. void clsList::strModel()
  2. {
  3.     strmodel = new QSqlRelationalTableModel(this);
  4.     strmodel->setEditStrategy(QSqlTableModel::OnRowChange);
  5.     strmodel->setTable("setCls_str");
  6.     strmodel->setFilter("setCls_str.actv1=1");
  7.  
  8.     int clInd = strmodel->fieldIndex("classCode");
  9.     int strInd = strmodel->fieldIndex("streams");
  10.     int clTInd = strmodel->fieldIndex("clTeach");
  11.  
  12.     strmodel->setRelation(clInd, QSqlRelation("tblClass", "clID", "clCode"));
  13.     strmodel->setRelation(strInd, QSqlRelation("tblStreams", "strID", "strName"));
  14.     strmodel->setRelation(clTInd, QSqlRelation("allTeachers", "trID", "trName"));
  15.  
  16.     strmodel->setHeaderData(strInd, Qt::Horizontal, tr("Stream"));
  17.     strmodel->setHeaderData(clInd, Qt::Horizontal, tr("Class"));
  18.     strmodel->setHeaderData(clTInd, Qt::Horizontal, tr("Teacher"));
  19.  
  20.     strmodel->database().transaction();
  21.     if(strmodel->submitAll())
  22.     {
  23.         strmodel->database().commit();
  24.     }
  25.     else
  26.     {
  27.         strmodel->database().rollback();
  28.     }
  29.  
  30.     if (!strmodel->select()) {
  31.         showError(strmodel->lastError());
  32.         return;}
  33.  
  34.     strProxy = new SortFilterProxyModel(this);
  35.     strProxy->setSourceModel(strmodel);
  36.     strProxy->setFilterCaseSensitivity(Qt::CaseInsensitive);
  37.  
  38.     ui->strmv->setModel(strProxy); // with this line all comboboxes disappear on my tableview
  39.   //  ui->strmv->setModel(strModel); // This line works well....with comboboxes visible on the grid 
  40. //but I need to filter data according to some parameters
  41.     ui->strmv->setItemDelegate(new QSqlRelationalDelegate(ui->strmv));
  42.     ui->strmv->setColumnWidth(clInd,50);
  43.     ui->strmv->setColumnWidth(strInd,100);
  44.     ui->strmv->setColumnWidth(clTInd,100);
  45. }
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