add backward-compatibility map for *filtersrc*

Author: etpinard

src/plot_api/helpers.js

@@ -340,6 +340,24 @@ exports.cleanData = function(data, existingData) {
             }
         }
 
+        // transforms backward compatibility fixes
+        if(Array.isArray(trace.transforms)) {
+            var transforms = trace.transforms;
+
+            for(i = 0; i < transforms.length; i++) {
+                var transform = transforms[i];
+
+                if(!Lib.isPlainObject(transform)) continue;
+
+                if(transform.type === 'filter') {
+                    if(transform.filtersrc) {
+                        transform.target = transform.filtersrc;
+                        delete transform.filtersrc;
+                    }
+                }
+            }
+        }
+
         // prune empty containers made before the new nestedProperty
         if(emptyContainer(trace, 'line')) delete trace.line;
         if('marker' in trace) {

test/jasmine/tests/plot_api_test.js

@@ -995,6 +995,35 @@ describe('Test plot api', function() {
 
             expect(gd.data[1].contours).toBeUndefined();
         });
+
+        it('should rename *filtersrc* to *target* in filter transforms', function() {
+            var data = [{
+                transforms: [{
+                    type: 'filter',
+                    filtersrc: 'y'
+                }, {
+                    type: 'filter',
+                    operation: '<'
+                }]
+            }, {
+                transforms: [{
+                    type: 'filter',
+                    target: 'y'
+                }]
+            }];
+
+            Plotly.plot(gd, data);
+
+            var trace0 = gd.data[0],
+                trace1 = gd.data[1];
+
+            expect(trace0.transforms.length).toEqual(2);
+            expect(trace0.transforms[0].filtersrc).toBeUndefined();
+            expect(trace0.transforms[0].target).toEqual('y');
+
+            expect(trace1.transforms.length).toEqual(1);
+            expect(trace1.transforms[0].target).toEqual('y');
+        });
     });
 
     describe('Plotly.update should', function() {