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

1 files changed, 7 insertions, 2 deletions

diff --git a/src/ng/directive/ngRepeat.js b/src/ng/directive/ngRepeat.js
index fdf79c02..b5fa60dd 100644
--- a/src/ng/directive/ngRepeat.js
+++ b/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) {