void QgsAttributeTableModel::loadAttributes() { if ( !layer() ) { return; } bool ins = false, rm = false; QgsAttributeList attributes; const QgsFields& fields = layer()->pendingFields(); for ( int idx = 0; idx < fields.count(); ++idx ) { switch ( layer()->editType( idx ) ) { case QgsVectorLayer::Hidden: continue; case QgsVectorLayer::ValueMap: mValueMaps.insert( idx, new QMap< QString, QVariant >( layer()->valueMap( idx ) ) ); break; case QgsVectorLayer::ValueRelation: { const QgsVectorLayer::ValueRelationData &data = layer()->valueRelation( idx ); QgsVectorLayer *layer = qobject_cast<QgsVectorLayer*>( QgsMapLayerRegistry::instance()->mapLayer( data.mLayer ) ); if ( !layer ) continue; int ki = layer->fieldNameIndex( data.mKey ); int vi = layer->fieldNameIndex( data.mValue ); QgsExpression *e = 0; if ( !data.mFilterExpression.isEmpty() ) { e = new QgsExpression( data.mFilterExpression ); if ( e->hasParserError() || !e->prepare( layer->pendingFields() ) ) continue; } if ( ki >= 0 && vi >= 0 ) { QSet<int> attributes; attributes << ki << vi; QgsFeatureRequest::Flag flags = QgsFeatureRequest::NoGeometry; if ( e ) { if ( e->needsGeometry() ) flags = QgsFeatureRequest::NoFlags; foreach ( const QString &field, e->referencedColumns() ) { int idx = layer->fieldNameIndex( field ); if ( idx < 0 ) continue; attributes << idx; } } QMap< QString, QVariant > *map = new QMap< QString, QVariant >(); QgsFeatureIterator fit = layer->getFeatures( QgsFeatureRequest().setFlags( flags ).setSubsetOfAttributes( attributes.toList() ) ); QgsFeature f; while ( fit.nextFeature( f ) ) { if ( e && !e->evaluate( &f ).toBool() ) continue; map->insert( f.attribute( vi ).toString(), f.attribute( ki ) ); } mValueMaps.insert( idx, map ); } } break; default: break; } attributes << idx; }