The use case is that i am populating the listView with the filtererd rows.
Here is the code.

Qt Code: 
  1. class ModelFilterProxyModel : public QSortFilterProxyModel
  2. {
  3.    Q_OBJECT
  4.  
  5. public:
  6.    ModelFilterProxyModel(QObject *parent = 0);
  7.    void SetSearchStr(QString str);
  8.  
  9. protected:
  10.    virtual bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const;
  11.  
  12. private:
  13. QString m_ManufSearchStr;
  14. };
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Qt Code: 
  1. bool ModelFilterProxyModel::filterAcceptsRow(int sourceRow,  const QModelIndex &sourceParent) const
  2. {
  3.    bool status = false;
  4.    bool found = false;
  5.    QModelIndex indexMod = sourceModel()->index(sourceRow, DevicesModel::MODEL, sourceParent);
  6.    QString modelStr = sourceModel()->data(indexMod).toString();
  7.  
  8.    QModelIndex index = sourceModel()->index(sourceRow, DevicesModel::MANUFACTURER, sourceParent);
  9.    QString manufacturetStr = sourceModel()->data(index).toString();
  10.     bool found = false;
  11.     // Checking for models by the specific manufacturer and eleminating duplicate models.
  12.      for (int row = sourceRow; row >= 0 ; --row)
  13.      {
  14.       QModelIndex index1 = sourceModel()->index(row - 1, DevicesModel::MODEL, sourceParent);
  15.       QModelIndex indexManf1 = sourceModel()->index(row - 1, DevicesModel::MANUFACTURER, sourceParent);
  16.       QString modelStr1 = sourceModel()->data(index1).toString();
  17.       QString manufacturetStr1 = sourceModel()->data(indexManf1).toString();
  18.        if (modelStr == modelStr1 && manufacturetStr == manufacturetStr1)
  19.        {
  20.         found = true;
  21.          // No need to search further - so break.
  22.          break;
  23.          }
  24.       }
  25.       if (!found && manufacturetStr == m_pPrivate->m_ManufSearchStr)
  26.       {
  27.          status = true;
  28.       }
  29.     return status;
  30.    }
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Qt Code: 
  1. m_ModelProxyModel->setDynamicSortFilter(true);
  2.       m_ModelProxyModel->setSourceModel(m_Model);
  3.       m_ModelProxyModel->sort(DevicesModel::MODEL);
  4.       m_Ui.modelListView->setModel(m_ModelProxyModel);
  5.       m_Ui.modelListView->setModelColumn(DevicesModel::MODEL);
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