fix(ngRepeat): handle iteration over identical obj values

Modifies default trackByIdFn to factor both key and value into hashKey
for non-array primitive (i.e. index not provided) values

Closes #2787
Closes #2806

Author: worrel

src/ng/directive/ngRepeat.js

@@ -205,7 +205,7 @@ var ngRepeatDirective = ['$parse', '$animator', function($parse, $animator) {
         var animate = $animator($scope, $attr);
         var expression = $attr.ngRepeat;
         var match = expression.match(/^\s*(.+)\s+in\s+(.*?)\s*(\s+track\s+by\s+(.+)\s*)?$/),
-          trackByExp, trackByExpGetter, trackByIdFn, lhs, rhs, valueIdentifier, keyIdentifier,
+          trackByExp, trackByExpGetter, trackByIdFn, trackByIdArrayFn, trackByIdObjFn, lhs, rhs, valueIdentifier, keyIdentifier,
           hashFnLocals = {$id: hashKey};
 
         if (!match) {
@@ -227,9 +227,12 @@ var ngRepeatDirective = ['$parse', '$animator', function($parse, $animator) {
             return trackByExpGetter($scope, hashFnLocals);
           };
         } else {
-          trackByIdFn = function(key, value) {
+          trackByIdArrayFn = function(key, value) {
             return hashKey(value);
           }
+          trackByIdObjFn = function(key) {
+            return key;
+          }
         }
 
         match = lhs.match(/^(?:([\$\w]+)|\(([\$\w]+)\s*,\s*([\$\w]+)\))$/);
@@ -266,7 +269,9 @@ var ngRepeatDirective = ['$parse', '$animator', function($parse, $animator) {
 
           if (isArrayLike(collection)) {
             collectionKeys = collection;
+            trackByIdFn = trackByIdFn || trackByIdArrayFn;
           } else {
+            trackByIdFn = trackByIdFn || trackByIdObjFn;
             // if object, extract keys, sort them and use to determine order of iteration over obj props
             collectionKeys = [];
             for (key in collection) {

test/ng/directive/ngRepeatSpec.js

@@ -89,6 +89,15 @@ describe('ngRepeat', function() {
     expect(element.text()).toEqual('misko:swe|shyam:set|');
   });
 
+  it('should iterate over an object/map with identical values', function() {
+    element = $compile(
+      '<ul>' +
+        '<li ng-repeat="(key, value) in items">{{key}}:{{value}}|</li>' +
+      '</ul>')(scope);
+    scope.items = {age:20, wealth:20, prodname: "Bingo", dogname: "Bingo", codename: "20"};
+    scope.$digest();
+    expect(element.text()).toEqual('age:20|codename:20|dogname:Bingo|prodname:Bingo|wealth:20|');
+  });
 
   describe('track by', function() {
     it('should track using expression function', function() {