Remove uniqueness constraint check

src/ol/source/vectorsource.js

@@ -135,10 +135,7 @@ ol.source.Vector.prototype.addFeatureInternal = function(feature) {
   }
   var id = feature.getId();
   if (goog.isDef(id)) {
-    var sid = id.toString();
+    this.idIndex_[id.toString()] = feature;
-    goog.asserts.assert(!(sid in this.idIndex_),
-        'Feature with same id already added to the source: ' + id);
-    this.idIndex_[sid] = feature;
   } else {
     goog.asserts.assert(!(featureKey in this.undefIdIndex_),
         'Feature already added to the source');
@@ -385,16 +382,12 @@ ol.source.Vector.prototype.handleFeatureChange_ = function(event) {
     var sid = id.toString();
     if (featureKey in this.undefIdIndex_) {
       delete this.undefIdIndex_[featureKey];
-      goog.asserts.assert(!goog.isDef(this.idIndex_[sid]),
-          'Duplicate feature id: ' + id);
       this.idIndex_[sid] = feature;
     } else {
       if (this.idIndex_[sid] !== feature) {
         removed = this.removeFromIdIndex_(feature);
         goog.asserts.assert(removed,
             'Expected feature to be removed from index');
-        goog.asserts.assert(!(sid in this.idIndex_),
-            'Duplicate feature id: ' + id);
         this.idIndex_[sid] = feature;
       }
     }

test/spec/ol/source/vectorsource.test.js

@@ -338,27 +338,25 @@ describe('ol.source.Vector', function() {
       source = new ol.source.Vector();
     });
 
-    it('enforces a uniqueness constraint (on add)', function() {
+    it('allows adding feature with the same id', function() {
       var feature = new ol.Feature();
       feature.setId('foo');
       source.addFeature(feature);
       var dupe = new ol.Feature();
       dupe.setId('foo');
-      expect(function() {
+      source.addFeature(dupe);
-        source.addFeature(dupe);
+      expect(source.getFeatureById('foo')).to.be(dupe);
-      }).to.throwException();
     });
 
-    it('enforces a uniqueness constraint (on change)', function() {
+    it('allows changing feature and set the same id', function() {
       var foo = new ol.Feature();
       foo.setId('foo');
       source.addFeature(foo);
       var bar = new ol.Feature();
       bar.setId('bar');
       source.addFeature(bar);
-      expect(function() {
+      bar.setId('foo');
-        bar.setId('foo');
+      expect(source.getFeatureById('foo')).to.be(bar);
-      }).to.throwException();
     });
 
   });