Forcing value to 1 on SANKEY_UNWEIGHTED (#419)

Author: BennuFire

docs/modules/ROOT/pages/user-guide/reports/sankey.adoc

@@ -31,7 +31,8 @@ the visualization.
 user hovers over a node or link.
 
 |Relationship Property |text | value | Name of the property with an integer value that is going
-to be used to determine thickness of links.
+to be used to determine thickness of links. Using 'SANKEY_UNWEIGHTED', this sankey will assume
+every relationship with a weight of 1.
 
 |Color Scheme |List | |The color scheme to use for the slices. Colors
 are assigned automatically (consecutively) to the different categories

src/extensions/advancedcharts/chart/sankey/SankeyChart.tsx

@@ -8,6 +8,8 @@ import NeoCodeViewerComponent from '../../../../component/editor/CodeViewerCompo
 import { isCyclic } from '../../Utils';
 import { extensionEnabled } from '../../../ExtensionUtils';
 
+const UNWEIGHTED_SANKEY_PROPERTY = 'SANKEY_UNWEIGHTED';
+
 /**
  * Embeds a SankeyChart (from Charts) into NeoDash.
  */
@@ -74,7 +76,16 @@ const NeoSankeyChart = (props: ChartProps) => {
         links[`${value.start.low},${value.end.low}`] = [];
       }
       const addItem = (arr, item) => arr.find((x) => x.id === item.id) || arr.push(item);
-      if (value.properties[labelProperty] !== undefined && !isNaN(value.properties[labelProperty])) {
+      if (labelProperty === UNWEIGHTED_SANKEY_PROPERTY) {
+        addItem(links[`${value.start.low},${value.end.low}`], {
+          id: value.identity.low,
+          source: value.start.low,
+          target: value.end.low,
+          type: value.type,
+          properties: value.properties,
+          value: 1,
+        });
+      } else if (value.properties[labelProperty] !== undefined && !isNaN(value.properties[labelProperty])) {
         addItem(links[`${value.start.low},${value.end.low}`], {
           id: value.identity.low,
           source: value.start.low,