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check if referencedLayer available

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This commit is contained in:
David Signer 2019-12-16 13:19:15 +01:00
parent 995335a9b5
commit bfde9609b1
1 changed files with 6 additions and 2 deletions
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8
src/gui/qgsexpressionbuilderwidget.cpp
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@ -484,8 +484,12 @@ void QgsExpressionBuilderWidget::fillFieldValues( const QString &fieldName, int
// if it's a request for the values of the referenced layer
if ( cbxRelatedLayerValues->isChecked() && setup.config().contains( QStringLiteral( "Relation" ) ) )
{
layer = mProject->relationManager()->relation( setup.config()[QStringLiteral( "Relation" )].toString() ).referencedLayer();
layerFieldIndex = mProject->relationManager()->relation( setup.config()[QStringLiteral( "Relation" )].toString() ).referencedFields().first();
QgsVectorLayer *referencedLayer = mProject->relationManager()->relation( setup.config()[QStringLiteral( "Relation" )].toString() ).referencedLayer();
if ( referencedLayer )
{
layer = referencedLayer;
layerFieldIndex = mProject->relationManager()->relation( setup.config()[QStringLiteral( "Relation" )].toString() ).referencedFields().first();
}
}
QList<QVariant> values = layer->uniqueValues( layerFieldIndex, countLimit ).toList();