add model variables in expressionContext scope to be mapped in case u…

…sed in symbolic formulas
qgis · Aug 28, 2018 · 0acb766412820fcb615a5beeaaecff36a03fe394 · 0acb766
1 parent 2810c92
commit 0acb766412820fcb615a5beeaaecff36a03fe394
Unified Split

Showing with 8 additions and 1 deletion.

+8 −1 src/core/processing/models/qgsprocessingmodelalgorithm.cpp
diff --git a/src/core/processing/models/qgsprocessingmodelalgorithm.cpp b/src/core/processing/models/qgsprocessingmodelalgorithm.cpp
@@ -273,6 +273,7 @@ QVariantMap QgsProcessingModelAlgorithm::processAlgorithm( const QVariantMap &pa
       QgsExpressionContext expContext = baseContext;
       expContext << QgsExpressionContextUtils::processingAlgorithmScope( child.algorithm(), parameters, context )
                  << createExpressionContextScopeForChildAlgorithm( childId, context, parameters, childResults );
+      context.setExpressionContext( expContext );
 
       QVariantMap childParams = parametersForChildAlgorithm( child, parameters, childResults, expContext );
       if ( feedback )
@@ -530,6 +531,9 @@ QMap<QString, QgsProcessingModelAlgorithm::VariableDefinition> QgsProcessingMode
     if ( !layer )
       layer = QgsProcessingUtils::mapLayerFromString( value.toString(), context );
 
+    // TODO: should I tag variable name with type? e.g. %1_maplayer
+    variables.insert( safeName( QStringLiteral( "%1" ).arg( name ) ), VariableDefinition( value, source, description ) );
+
     variables.insert( safeName( QStringLiteral( "%1_minx" ).arg( name ) ), VariableDefinition( layer ? layer->extent().xMinimum() : QVariant(), source, QObject::tr( "Minimum X of %1" ).arg( description ) ) );
     variables.insert( safeName( QStringLiteral( "%1_miny" ).arg( name ) ), VariableDefinition( layer ? layer->extent().yMinimum() : QVariant(), source, QObject::tr( "Minimum Y of %1" ).arg( description ) ) );
     variables.insert( safeName( QStringLiteral( "%1_maxx" ).arg( name ) ), VariableDefinition( layer ? layer->extent().xMaximum() : QVariant(), source, QObject::tr( "Maximum X of %1" ).arg( description ) ) );
@@ -595,6 +599,9 @@ QMap<QString, QgsProcessingModelAlgorithm::VariableDefinition> QgsProcessingMode
         featureSource = vl;
     }
 
+    // TODO: should I tag variable name with type? e.g. %1_feature
+    variables.insert( safeName( QStringLiteral( "%1" ).arg( name ) ), VariableDefinition( value, source, description ) );
+
     variables.insert( safeName( QStringLiteral( "%1_minx" ).arg( name ) ), VariableDefinition( featureSource ? featureSource->sourceExtent().xMinimum() : QVariant(), source, QObject::tr( "Minimum X of %1" ).arg( description ) ) );
     variables.insert( safeName( QStringLiteral( "%1_miny" ).arg( name ) ), VariableDefinition( featureSource ? featureSource->sourceExtent().yMinimum() : QVariant(), source, QObject::tr( "Minimum Y of %1" ).arg( description ) ) );
     variables.insert( safeName( QStringLiteral( "%1_maxx" ).arg( name ) ), VariableDefinition( featureSource ? featureSource->sourceExtent().xMaximum() : QVariant(), source, QObject::tr( "Maximum X of %1" ).arg( description ) ) );
@@ -606,7 +613,7 @@ QMap<QString, QgsProcessingModelAlgorithm::VariableDefinition> QgsProcessingMode
 
 QgsExpressionContextScope *QgsProcessingModelAlgorithm::createExpressionContextScopeForChildAlgorithm( const QString &childId, QgsProcessingContext &context, const QVariantMap &modelParameters, const QVariantMap &results ) const
 {
-  std::unique_ptr< QgsExpressionContextScope > scope( new QgsExpressionContextScope() );
+  std::unique_ptr< QgsExpressionContextScope > scope( new QgsExpressionContextScope( QStringLiteral( "algorithm_inputs" ) ) );
   QMap< QString, QgsProcessingModelAlgorithm::VariableDefinition> variables = variablesForChildAlgorithm( childId, context, modelParameters, results );
   QMap< QString, QgsProcessingModelAlgorithm::VariableDefinition>::const_iterator varIt = variables.constBegin();
   for ( ; varIt != variables.constEnd(); ++varIt )