CHANGELOG.md

@@ -20,4 +20,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+* #11 - Transaction::GetResultSet() now always returns a valid reference.
+
 ### Security

include/caosdb/transaction.h

@@ -365,6 +365,10 @@ public:
   [[nodiscard]] inline auto GetStatus() const noexcept -> TransactionStatus { return this->status; }
 
   [[nodiscard]] inline auto GetResultSet() const noexcept -> const ResultSet & {
+    if (!this->result_set) {
+      this->result_set = std::make_unique<MultiResultSet>(
+          std::move(std::vector<std::unique_ptr<Entity>>()));
+    }
     return *(this->result_set.get());
   }
 

src/caosdb/unary_rpc_handler.cpp

@@ -112,7 +112,7 @@ void UnaryRpcHandler::handleCallCompleteState() {
 
   switch (status_.error_code()) {
   case grpc::OK:
-    CAOSDB_LOG_INFO(logger_name) << "UnaryRpcHandler finished successfully.";
+    CAOSDB_LOG_TRACE(logger_name) << "UnaryRpcHandler finished successfully.";
     break;
   default:
     auto code(static_cast<StatusCode>(status_.error_code()));

test/CMakeLists.txt

@@ -26,6 +26,7 @@ set(test_cases
     test_entity
     test_file_transmission
     test_info
+    test_issues
     test_list_properties
     test_protobuf
     test_transaction

test/test_issues.cpp

+/*
+ * This file is a part of the CaosDB Project.
+ *
+ * Copyright (C) 2021 Daniel Hornung <d.hornung@indiscale.com>
+ * Copyright (C) 2021 IndiScale GmbH <info@indiscale.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+#include "caosdb/configuration.h"           // for InsecureConnectionConfig...
+#include "caosdb/connection.h"              // for Connection
+#include "caosdb/exceptions.h"              // for ConnectionError
+#include "caosdb/status_code.h"
+#include "caosdb/transaction.h"         // for Transaction
+#include <gtest/gtest-message.h>        // for Message
+#include <gtest/gtest-test-part.h>      // for SuiteApiResolver, TestPa...
+#include <gtest/gtest_pred_impl.h>      // for Test, TestInfo, TEST
+
+namespace caosdb::transaction {
+using caosdb::configuration::InsecureConnectionConfiguration;
+using caosdb::connection::Connection;
+
+TEST(test_issues, test_issue_11) {
+  const auto *host = "localhost";
+  auto configuration = InsecureConnectionConfiguration(host, 8000);
+  Connection connection(configuration);
+  auto transaction = connection.CreateTransaction();
+
+  ASSERT_EQ(transaction->GetResultSet().size(), 0);
+  transaction->RetrieveById("100");
+  ASSERT_EQ(StatusCode::EXECUTING, transaction->ExecuteAsynchronously());
+  // Trying to obtain ResultSet while it is still empty.
+  ASSERT_EQ(transaction->GetResultSet().size(), 0);
+}
+
+} // namespace caosdb::transaction