Merge pull request #403 from realm/sk-invalidation-test

Fix crash inside detached Results and add tests

CHANGELOG.md

@@ -9,7 +9,8 @@ x.x.x Release notes (yyyy-MM-dd)
 
 ### Bugfixes
 * When accessing an empty Results `undefined` is returned rather than throwing an exception
-* Accessing a deleted object throws a javascript exception rather than crashing
+* Accessing a deleted object throws a JS exception rather than crashing
+* Accessing an invalidated Results snapshot throws a JS exception rather than crashing
 
 0.11.1 Release notes (2016-3-29)
 =============================================================

src/js_schema.hpp

@@ -210,7 +210,7 @@ realm::Schema Schema<T>::parse_schema(ContextType ctx, ObjectType schema_object,
     uint32_t length = Object::validated_get_length(ctx, schema_object);
 
     for (uint32_t i = 0; i < length; i++) {
-        ObjectType object_schema_object = Object::validated_get_object(ctx, schema_object, i);
+        ObjectType object_schema_object = Object::validated_get_object(ctx, schema_object, i, "ObjectSchema");
         ObjectSchema object_schema = parse_object_schema(ctx, object_schema_object, defaults, constructors);
         schema.emplace_back(std::move(object_schema));
     }

src/object-store/src/object_store.cpp

@@ -505,7 +505,7 @@ bool ObjectStore::is_empty(const Group *group) {
 InvalidSchemaVersionException::InvalidSchemaVersionException(uint64_t old_version, uint64_t new_version) :
     m_old_version(old_version), m_new_version(new_version)
 {
-    m_what = "Provided schema version " + util::to_string(old_version) + " is less than last set version " + util::to_string(new_version) + ".";
+    m_what = "Provided schema version " + util::to_string(new_version) + " is less than last set version " + util::to_string(old_version) + ".";
 }
 
 DuplicatePrimaryKeyValueException::DuplicatePrimaryKeyValueException(std::string const& object_type, Property const& property) :

src/object-store/src/results.cpp

@@ -82,6 +82,8 @@ void Results::validate_write() const
 
 void Results::set_live(bool live)
 {
+    validate_read();
+
     if (!live && m_mode == Mode::Table) {
         m_query = m_table->where();
         m_mode = Mode::Query;

tests/js/results-tests.js

@@ -278,5 +278,32 @@ module.exports = BaseTest.extend({
         TestCase.assertEqual(objects[0].boolCol, true, 'first element descending for boolCol');
         TestCase.assertEqual(objects[1].boolCol, false, 'second element descending for boolCol');
         TestCase.assertEqual(objects[2].boolCol, false, 'third element descending for boolCol');
+    },
+
+    testResultsInvalidation: function() {
+        var realm = new Realm({schema: [schemas.TestObject]});
+        var testObjects = realm.objects('TestObject');
+        var filteredObjects = testObjects.filtered('doubleCol > 1');
+        var sortedObjects = testObjects.sorted('doubleCol');
+        var snapshotObjects = testObjects.snapshot();
+
+        realm.close();
+
+        realm = new Realm({
+            schemaVersion: 1,
+            schema: [schemas.TestObject, schemas.BasicTypes]
+        });
+
+        [
+            testObjects,
+            filteredObjects,
+            sortedObjects,
+            snapshotObjects,
+        ].forEach(function(objects) {
+            TestCase.assertThrows(function() { objects[0]; });
+            TestCase.assertThrows(function() { objects.filtered('doubleCol < 42'); });
+            TestCase.assertThrows(function() { objects.sorted('doubleCol', true); });
+            TestCase.assertThrows(function() { objects.snapshot(); });
+        });
     }
 });