Adding the support for '$exists' into the get_items for split mongo.

TNL-1451

common/lib/xmodule/xmodule/modulestore/__init__.py

@@ -777,6 +777,10 @@ class ModuleStoreRead(ModuleStoreAssetBase):
 
         for key, criteria in qualifiers.iteritems():
             is_set, value = _is_set_on(key)
+
+            if isinstance(criteria, dict) and '$exists' in criteria and criteria['$exists'] == is_set:
+                continue
+
             if not is_set:
                 return False
             if not self._value_matches(value, criteria):

common/lib/xmodule/xmodule/modulestore/inheritance.py

@@ -90,6 +90,10 @@ class InheritanceMixin(XBlockMixin):
         help="Amount of time after the due date that submissions will be accepted",
         scope=Scope.settings,
     )
+    group_access = Dict(
+        help=_("Enter the ids for the content groups this problem belongs to."),
+        scope=Scope.settings,
+    )
     showanswer = String(
         display_name=_("Show Answer"),
         help=_("Specify when the Show Answer button appears for each problem. Valid values are \"always\", \"answered\", \"attempted\", \"closed\", \"finished\", \"past_due\", and \"never\"."),

common/lib/xmodule/xmodule/modulestore/tests/test_split_modulestore.py

@@ -295,6 +295,16 @@ class SplitModuleTest(unittest.TestCase):
                             "fields": {
                                 "display_name": "Problem 3.2"
                             },
+                        },
+                        {
+                            "id": "problem32",
+                            "parent": "chapter3",
+                            "parent_type": "chapter",
+                            "category": "problem",
+                            "fields": {
+                                "display_name": "Problem 3.3",
+                                "group_access": {"3": ["33"]},
+                            },
                         }
                     ]
                 },
@@ -898,6 +908,17 @@ class SplitModuleItemTests(SplitModuleTest):
         self.assertFalse(modulestore()._value_matches('gotcha', {'$nin': ['a', 'bunch', 'of', 'gotcha']}))
         self.assertTrue(modulestore()._value_matches('gotcha', {'$nin': ['a', 'bunch', 'of', 'gotchas']}))
 
+        self.assertTrue(modulestore()._block_matches({'group_access': {'1': [1]}}, {'group_access': {'$exists': True}}))
+        self.assertTrue(modulestore()._block_matches({'a': 1, 'b': 2}, {'group_access': {'$exists': False}}))
+        self.assertTrue(modulestore()._block_matches(
+            {'a': 1, 'group_access': {'1': [1]}},
+            {'a': 1, 'group_access': {'$exists': True}}))
+        self.assertFalse(modulestore()._block_matches(
+            {'a': 1, 'group_access': {'1': [1]}},
+            {'a': 111, 'group_access': {'$exists': True}}))
+        self.assertTrue(modulestore()._block_matches({'a': 1, 'b': 2}, {'a': 1, 'group_access': {'$exists': False}}))
+        self.assertFalse(modulestore()._block_matches({'a': 1, 'b': 2}, {'a': 9, 'group_access': {'$exists': False}}))
+
         self.assertTrue(modulestore()._block_matches({'a': 1, 'b': 2}, {'a': 1}))
         self.assertFalse(modulestore()._block_matches({'a': 1, 'b': 2}, {'a': 2}))
         self.assertFalse(modulestore()._block_matches({'a': 1, 'b': 2}, {'c': 1}))
@@ -911,9 +932,9 @@ class SplitModuleItemTests(SplitModuleTest):
         locator = CourseLocator(org='testx', course='GreekHero', run="run", branch=BRANCH_NAME_DRAFT)
         # get all modules
         matches = modulestore().get_items(locator)
-        self.assertEqual(len(matches), 6)
+        self.assertEqual(len(matches), 7)
         matches = modulestore().get_items(locator)
-        self.assertEqual(len(matches), 6)
+        self.assertEqual(len(matches), 7)
         matches = modulestore().get_items(locator, qualifiers={'category': 'chapter'})
         self.assertEqual(len(matches), 3)
         matches = modulestore().get_items(locator, qualifiers={'category': 'garbage'})
@@ -924,6 +945,10 @@ class SplitModuleItemTests(SplitModuleTest):
             settings={'display_name': re.compile(r'Hera')},
         )
         self.assertEqual(len(matches), 2)
+        matches = modulestore().get_items(locator, settings={'group_access': {'$exists': True}})
+        self.assertEqual(len(matches), 1)
+        matches = modulestore().get_items(locator, settings={'group_access': {'$exists': False}})
+        self.assertEqual(len(matches), 6)
 
     def test_get_parents(self):
         '''