read source from provider before saving memory layer (fixes #8997)

qgis · Dec 30, 2015 · dbc0f07 · dbc0f07
1 parent 766bfa1
commit dbc0f07
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/src/core/qgsmaplayer.cpp b/src/core/qgsmaplayer.cpp
@@ -46,6 +46,7 @@
 #include "qgsrasterlayer.h"
 #include "qgsrectangle.h"
 #include "qgsvectorlayer.h"
+#include "qgsvectordataprovider.h"
 
 
 QgsMapLayer::QgsMapLayer( QgsMapLayer::LayerType type,
@@ -569,6 +570,11 @@ bool QgsMapLayer::writeLayerXML( QDomElement& layerElement, QDomDocument& docume
     urlDest.setQueryItems( urlSource.queryItems() );
     src = QString::fromAscii( urlDest.toEncoded() );
   }
+  else if ( vlayer && vlayer->providerType() == "memory" )
+  {
+    // Refetch the source from the provider, because adding fields actually changes the source for this provider.
+    src = vlayer->dataProvider()->dataSourceUri();
+  }
   else
   {
     bool handled = false;