Rowid column from ogr provider is ignored thanks to a blacklist join option

python/core/qgsvectorlayerjoininfo.sip

@@ -166,6 +166,23 @@ Returns whether values from the joined layer should be cached in memory to speed
  :rtype: QgsFeature
 %End
 
+    void setJoinFieldNamesBlackList( const QStringList &blackList );
+
+    QStringList joinFieldNamesBlackList() const;
+%Docstring
+ :rtype: list of str
+%End
+
+    bool hasSubset( bool blacklisted = true ) const;
+%Docstring
+ :rtype: bool
+%End
+
+    static QStringList joinFieldNamesSubset( const QgsVectorLayerJoinInfo &info, bool blacklisted = true );
+%Docstring
+ :rtype: list of str
+%End
+
     bool operator==( const QgsVectorLayerJoinInfo &other ) const;
 
     void setJoinFieldNamesSubset( QStringList *fieldNamesSubset /Transfer/ );
@@ -194,6 +211,7 @@ Returns whether values from the joined layer should be cached in memory to speed
 
 
 
+
 };
 
 

src/core/qgsauxiliarystorage.cpp

@@ -168,6 +168,7 @@ QgsAuxiliaryLayer::QgsAuxiliaryLayer( const QString &pkField, const QString &fil
   mJoinInfo.setEditable( true );
   mJoinInfo.setUpsertOnEdit( true );
   mJoinInfo.setCascadedDelete( true );
+  mJoinInfo.setJoinFieldNamesBlackList( QStringList() << "rowid" ); // introduced by ogr provider
 }
 
 QgsVectorLayer *QgsAuxiliaryLayer::toSpatialLayer() const

src/core/qgsvectorlayerfeatureiterator.cpp

@@ -944,10 +944,12 @@ void QgsVectorLayerFeatureIterator::FetchJoinInfo::addJoinedAttributesDirect( Qg
 
   // maybe user requested just a subset of layer's attributes
   // so we do not have to cache everything
-  bool hasSubset = joinInfo->joinFieldNamesSubset();
   QVector<int> subsetIndices;
-  if ( hasSubset )
-    subsetIndices = QgsVectorLayerJoinBuffer::joinSubsetIndices( joinLayer, *joinInfo->joinFieldNamesSubset() );
+  if ( joinInfo->hasSubset() )
+  {
+    const QStringList subsetNames = QgsVectorLayerJoinInfo::joinFieldNamesSubset( *joinInfo );
+    subsetIndices = QgsVectorLayerJoinBuffer::joinSubsetIndices( joinLayer, subsetNames );
+  }
 
   // select (no geometry)
   QgsFeatureRequest request;
@@ -963,7 +965,7 @@ void QgsVectorLayerFeatureIterator::FetchJoinInfo::addJoinedAttributesDirect( Qg
   {
     int index = indexOffset;
     QgsAttributes attr = fet.attributes();
-    if ( hasSubset )
+    if ( joinInfo->hasSubset() )
     {
       for ( int i = 0; i < subsetIndices.count(); ++i )
         f.setAttribute( index++, attr.at( subsetIndices.at( i ) ) );

src/core/qgsvectorlayerjoinbuffer.cpp

@@ -137,11 +137,11 @@ void QgsVectorLayerJoinBuffer::cacheJoinLayer( QgsVectorLayerJoinInfo &joinInfo
     request.setFlags( QgsFeatureRequest::NoGeometry );
     // maybe user requested just a subset of layer's attributes
     // so we do not have to cache everything
-    bool hasSubset = joinInfo.joinFieldNamesSubset();
     QVector<int> subsetIndices;
-    if ( hasSubset )
+    if ( joinInfo.hasSubset() )
     {
-      subsetIndices = joinSubsetIndices( cacheLayer, *joinInfo.joinFieldNamesSubset() );
+      const QStringList subsetNames = QgsVectorLayerJoinInfo::joinFieldNamesSubset( joinInfo );
+      subsetIndices = joinSubsetIndices( cacheLayer, subsetNames );
 
       // we need just subset of attributes - but make sure to include join field name
       QgsAttributeList cacheLayerAttrs = subsetIndices.toList();
@@ -156,7 +156,7 @@ void QgsVectorLayerJoinBuffer::cacheJoinLayer( QgsVectorLayerJoinInfo &joinInfo
     {
       QgsAttributes attrs = f.attributes();
       QString key = attrs.at( joinFieldIndex ).toString();
-      if ( hasSubset )
+      if ( joinInfo.hasSubset() )
       {
         QgsAttributes subsetAttrs( subsetIndices.count() );
         for ( int i = 0; i < subsetIndices.count(); ++i )
@@ -213,11 +213,10 @@ void QgsVectorLayerJoinBuffer::updateFields( QgsFields &fields )
     QString joinFieldName = joinIt->joinFieldName();
 
     QSet<QString> subset;
-    bool hasSubset = false;
-    if ( joinIt->joinFieldNamesSubset() )
+    if ( joinIt->hasSubset() )
     {
-      hasSubset = true;
-      subset = QSet<QString>::fromList( *joinIt->joinFieldNamesSubset() );
+      const QStringList subsetNames = QgsVectorLayerJoinInfo::joinFieldNamesSubset( *joinIt );
+      subset = QSet<QString>::fromList( subsetNames );
     }
 
     if ( joinIt->prefix().isNull() )
@@ -232,12 +231,12 @@ void QgsVectorLayerJoinBuffer::updateFields( QgsFields &fields )
     for ( int idx = 0; idx < joinFields.count(); ++idx )
     {
       // if using just a subset of fields, filter some of them out
-      if ( hasSubset && !subset.contains( joinFields.at( idx ).name() ) )
+      if ( joinIt->hasSubset() && !subset.contains( joinFields.at( idx ).name() ) )
         continue;
 
       //skip the join field to avoid double field names (fields often have the same name)
       // when using subset of field, use all the selected fields
-      if ( hasSubset || joinFields.at( idx ).name() != joinFieldName )
+      if ( joinIt->hasSubset() || joinFields.at( idx ).name() != joinFieldName )
       {
         QgsField f = joinFields.at( idx );
         f.setName( prefix + f.name() );
@@ -279,10 +278,12 @@ void QgsVectorLayerJoinBuffer::writeXml( QDomNode &layer_node, QDomDocument &doc
     joinElem.setAttribute( QStringLiteral( "upsertOnEdit" ), joinIt->hasUpsertOnEdit() );
     joinElem.setAttribute( QStringLiteral( "cascadedDelete" ), joinIt->hasCascadedDelete() );
 
-    if ( joinIt->joinFieldNamesSubset() )
+    if ( joinIt->hasSubset() )
     {
       QDomElement subsetElem = document.createElement( QStringLiteral( "joinFieldsSubset" ) );
-      Q_FOREACH ( const QString &fieldName, *joinIt->joinFieldNamesSubset() )
+      const QStringList subsetNames = QgsVectorLayerJoinInfo::joinFieldNamesSubset( *joinIt );
+
+      Q_FOREACH ( const QString &fieldName, subsetNames )
       {
         QDomElement fieldElem = document.createElement( QStringLiteral( "field" ) );
         fieldElem.setAttribute( QStringLiteral( "name" ), fieldName );
@@ -552,10 +553,10 @@ bool QgsVectorLayerJoinBuffer::addFeatures( QgsFeatureList &features, QgsFeature
 
         if ( existingFeature.isValid() )
         {
-          const QStringList *subsetFields = info.joinFieldNamesSubset();
-          if ( subsetFields )
+          if ( info.hasSubset() )
           {
-            Q_FOREACH ( const QString &field, *subsetFields )
+            const QStringList subsetNames = QgsVectorLayerJoinInfo::joinFieldNamesSubset( info );
+            Q_FOREACH ( const QString &field, subsetNames )
             {
               QVariant newValue = joinFeature.attribute( field );
               int fieldIndex = joinLayer->fields().indexOf( field );

src/core/qgsvectorlayerjoininfo.cpp

@@ -68,3 +68,50 @@ QgsFeature QgsVectorLayerJoinInfo::extractJoinedFeature( const QgsFeature &featu
 
   return joinFeature;
 }
+
+QStringList QgsVectorLayerJoinInfo::joinFieldNamesSubset( const QgsVectorLayerJoinInfo &info, bool blacklisted )
+{
+  QStringList fieldNames;
+
+  if ( blacklisted && !info.joinFieldNamesBlackList().isEmpty() )
+  {
+    QStringList *lst = info.joinFieldNamesSubset();
+    if ( lst )
+    {
+      Q_FOREACH ( const QString &s, *lst )
+      {
+        if ( !info.joinFieldNamesBlackList().contains( s ) )
+          fieldNames.append( s );
+      }
+    }
+    else
+    {
+      Q_FOREACH ( const QgsField &f, info.joinLayer()->fields() )
+      {
+        if ( !info.joinFieldNamesBlackList().contains( f.name() )
+             && f.name() != info.joinFieldName() )
+          fieldNames.append( f.name() );
+      }
+    }
+  }
+  else
+  {
+    QStringList *lst = info.joinFieldNamesSubset();
+    if ( lst )
+    {
+      fieldNames = *lst;
+    }
+  }
+
+  return fieldNames;
+}
+
+bool QgsVectorLayerJoinInfo::hasSubset( bool blacklisted ) const
+{
+  bool subset = joinFieldNamesSubset();
+
+  if ( blacklisted )
+    subset |= !joinFieldNamesBlackList().isEmpty();
+
+  return subset;
+}

src/core/qgsvectorlayerjoininfo.h

@@ -141,6 +141,14 @@ class CORE_EXPORT QgsVectorLayerJoinInfo
      */
     QgsFeature extractJoinedFeature( const QgsFeature &feature ) const;
 
+    void setJoinFieldNamesBlackList( const QStringList &blackList ) { mBlackList = blackList; }
+
+    QStringList joinFieldNamesBlackList() const { return mBlackList; }
+
+    bool hasSubset( bool blacklisted = true ) const;
+
+    static QStringList joinFieldNamesSubset( const QgsVectorLayerJoinInfo &info, bool blacklisted = true );
+
     bool operator==( const QgsVectorLayerJoinInfo &other ) const
     {
       return mTargetFieldName == other.mTargetFieldName &&
@@ -197,6 +205,8 @@ class CORE_EXPORT QgsVectorLayerJoinInfo
 
     bool mCascadedDelete = false;
 
+    QStringList mBlackList;
+
     //! Cache for joined attributes to provide fast lookup (size is 0 if no memory caching)
     QHash< QString, QgsAttributes> cachedAttributes;
 

src/gui/qgsattributeform.cpp

@@ -1996,10 +1996,11 @@ void QgsAttributeForm::updateJoinedFields( const QgsEditorWidgetWrapper &eww )
 
     mJoinedFeatures[info] = joinFeature;
 
-    QStringList *subsetFields = info->joinFieldNamesSubset();
-    if ( subsetFields )
+    if ( info->hasSubset() )
     {
-      Q_FOREACH ( const QString &field, *subsetFields )
+      const QStringList subsetNames = QgsVectorLayerJoinInfo::joinFieldNamesSubset( *info );
+
+      Q_FOREACH ( const QString &field, subsetNames )
       {
         QString prefixedName = info->prefixedFieldName( field );
         QVariant val;