fix(filterFilter): let expression object {$: '...'} also match primitive items

Closes #10428

Author: gkalpak

src/ng/filter/filter.js

@@ -133,6 +133,15 @@ function filterFilter() {
         //jshint -W086
       case 'object':
         //jshint +W086
+        if (!matchAgainstAnyProp && (expression !== null) && ('$' in expression)) {
+          var keysCount = 0;
+          for (var key in expression) { keysCount++; }
+          if (keysCount === 1) {
+            expression = expression.$;
+            matchAgainstAnyProp = true;
+          }
+        }
+
         predicateFn = createPredicateFn(expression, comparator, matchAgainstAnyProp);
         break;
       default:

test/ng/filter/filterSpec.js

@@ -65,6 +65,26 @@ describe('Filter: filter', function() {
   });
 
 
+  it('should treat expression `{$: \'xyz\'}` as `\'xyz\'`', function() {
+    var items, expr;
+
+    items = ['something', 'something else', 'another thing'];
+    expr = {$: 'some'};
+    expect(filter(items, expr).length).toBe(2);
+    expect(filter(items, expr)).toEqual([items[0], items[1]]);
+
+    items = [{val: 'something'}, {val: 'something else'}, {val: 'another thing'}];
+    expr = {$: 'some'};
+    expect(filter(items, expr).length).toBe(2);
+    expect(filter(items, expr)).toEqual([items[0], items[1]]);
+
+    items = [123, 456, 789];
+    expr = {$: 1};
+    expect(filter(items, expr).length).toBe(1);
+    expect(filter(items, expr)).toEqual([items[0]]);
+  });
+
+
   it('should take object as predicate', function() {
     var items = [{first: 'misko', last: 'hevery'},
                  {first: 'adam', last: 'abrons'}];