gistfile1.txt

mapC = qgis.utils.iface.mapCanvas()
layer = mapC.currentLayer()
provider = layer.dataProvider()
feat = QgsFeature()
provider.nextFeature(feat)

myGeom = QgsGeometry( feat.geometry() )

layer.startEditing()

while provider.nextFeature(feat):
  feat.setGeom(myGeom)
  layer.updateFeature(feat)

layer.commitChanges()

diff --git a/python/core/qgsvectorlayer.sip b/python/core/qgsvectorlayer.sip
index 98eee7e..28b94ff 100644
--- a/python/core/qgsvectorlayer.sip
+++ b/python/core/qgsvectorlayer.sip
@@ -272,10 +272,17 @@ public:
bool featureAtId(int featureId, QgsFeature& f, bool fetchGeometries = true, bool fetchAttributes = true);

/** Adds a feature

•  @param f feature to add
  

  @param alsoUpdateExtent If True, will also go to the effort of e.g. updating the extents.
  @return True in case of success and False in case of error
  */
  bool addFeature(QgsFeature& f, bool alsoUpdateExtent = TRUE);
  +
• /** Update an existing feature

•  @param f feature to update
  

•  @return                    True in case of success and False in case of error
  

• */
• bool updateFeature(QgsFeature& f );

/** Insert a new vertex before the given vertex number,
diff --git a/src/core/qgsvectorlayer.cpp b/src/core/qgsvectorlayer.cpp
index 42683c5..bc8fb74 100644
--- a/src/core/qgsvectorlayer.cpp
+++ b/src/core/qgsvectorlayer.cpp
@@ -1947,6 +1947,42 @@ bool QgsVectorLayer::addFeature( QgsFeature& f, bool alsoUpdateExtent )
return true;
}

+bool QgsVectorLayer::updateFeature( QgsFeature &f )
+{

• QgsFeature current;
• if( !featureAtId( f.id(), current, f.geometry(), !f.attributeMap().isEmpty() ) )
• {
• QgsDebugMsg( QString( "feature %1 could not be retrieved" ).arg( f.id() ) );
• return false;
• }

• if( f.geometry() && current.geometry() && f.geometry() != current.geometry() && !f.geometry()->isGeosEqual( *current.geometry() ) )
• {
• if( !changeGeometry( f.id(), f.geometry() ) )
• {

•  QgsDebugMsg( QString( "geometry of feature %1 could not be changed." ).arg( f.id() ) );
  

•  return false;
  

• }
• }

• const QgsAttributeMap &fa = f.attributeMap();
• const QgsAttributeMap &ca = current.attributeMap();

• foreach( int attr, fa.keys() )
• {
• if( fa.contains( attr ) && ca.contains( attr ) && fa[attr] != ca[attr] )
• {

•  if( !changeAttributeValue( f.id(), attr, fa[attr] ) )
  

•  {
  

•    QgsDebugMsg( QString( "attribute %1 of feature %2 could not be changed." ).arg( attr ).arg( f.id() ) );
  

•    return false;
  

•  }
  

• }
• }

• return true;
  +}

bool QgsVectorLayer::insertVertex( double x, double y, QgsFeatureId atFeatureId, int beforeVertex )
{
diff --git a/src/core/qgsvectorlayer.h b/src/core/qgsvectorlayer.h
index 0db953b..4fc740c 100644
--- a/src/core/qgsvectorlayer.h
+++ b/src/core/qgsvectorlayer.h
@@ -351,6 +351,11 @@ class CORE_EXPORT QgsVectorLayer : public QgsMapLayer
*/
bool addFeature( QgsFeature& f, bool alsoUpdateExtent = true );

• /** Updates an existing feature

•    @param f feature to update
  

•    @return                    True in case of success and False in case of error
  

• */
  

• bool updateFeature( QgsFeature &f );

/** Insert a new vertex before the given vertex number,

• in the given ring, item (first number is index 0), and feature