fix(angular): do not copy $$hashKey in copy/extend functions.

Copying the $$hashKey as part of copy/extend operations makes little
sense since hashkey is used primarily as an object id, especially in
the context of the ngRepeat directive. This change maintains the
existing $$hashKey of an object that is being copied into (likewise for
extend).
It is not uncommon to take an item in a collection, copy it,
and then append it to the collection. By copying the $$hashKey, this
leads to duplicate object errors with the current ngRepeat.

Closes #1875

1 files changed, 57 insertions, 0 deletions

diff --git a/test/AngularSpec.js b/test/AngularSpec.js
index 7f1ab8a3..0e5017ad 100644
--- a/test/AngularSpec.js
+++ b/test/AngularSpec.js
@@ -98,6 +98,63 @@ describe('angular', function() {
       src = dst = [2, 4];
       expect(function() { copy(src, dst); }).toThrow("Can't copy equivalent objects or arrays");
     });
+
+    it('should not copy the private $$hashKey', function() {
+      var src,dst;
+      src = {};
+      hashKey(src);
+      dst = copy(src);
+      expect(hashKey(dst)).not.toEqual(hashKey(src));
+    });
+
+    it('should retain the previous $$hashKey', function() {
+      var src,dst,h;
+      src = {};
+      dst = {};
+      // force creation of a hashkey
+      h = hashKey(dst);
+      hashKey(src);
+      dst = copy(src,dst);
+
+      // make sure we don't copy the key
+      expect(hashKey(dst)).not.toEqual(hashKey(src));
+      // make sure we retain the old key
+      expect(hashKey(dst)).toEqual(h);
+    });
+  });
+
+  describe("extend", function() {
+
+    it('should not copy the private $$hashKey', function() {
+      var src,dst;
+      src = {};
+      dst = {};
+      hashKey(src);
+      dst = extend(dst,src);
+      expect(hashKey(dst)).not.toEqual(hashKey(src));
+    });
+
+    it('should retain the previous $$hashKey', function() {
+      var src,dst,h;
+      src = {};
+      dst = {};
+      h = hashKey(dst);
+      hashKey(src);
+      dst = extend(dst,src);
+      // make sure we don't copy the key
+      expect(hashKey(dst)).not.toEqual(hashKey(src));
+      // make sure we retain the old key
+      expect(hashKey(dst)).toEqual(h);
+    });
+
+    it('should work when extending with itself', function() {
+      var src,dst,h;
+      dst = src = {};
+      h = hashKey(dst);
+      dst = extend(dst,src);
+      // make sure we retain the old key
+      expect(hashKey(dst)).toEqual(h);
+    });
   });
 
   describe('shallow copy', function() {