added has_one eager functionality and tests

test/backends/SessionInsertHasOne.cpp

@@ -7,12 +7,13 @@
 #include "matador/query/session.hpp"
 
 #include "models/user.hpp"
+#include "models/country.hpp"
 
 using namespace matador::test;
 using namespace matador::query;
 using namespace matador::object;
 
-TEST_CASE_METHOD(SessionFixture, "Test insert object with has_one relation", "[session][insert][has_one]") {
+TEST_CASE_METHOD(SessionFixture, "Test insert object with has_one relation lazy", "[session][insert][has_one][lazy]") {
   const auto result = schema.attach<user_identity>("users")
     .and_then( [this] { return schema.attach<user_session_identity>("user_sessions"); } )
     .and_then([this] { return schema.create(db); } );
@@ -33,4 +34,27 @@ TEST_CASE_METHOD(SessionFixture, "Test insert object with has_one relation", "[s
   REQUIRE(user_result.is_ok());
   us = user_result.value()->session;
   REQUIRE(us->session_token == "session1");
+}
+
+TEST_CASE_METHOD(SessionFixture, "Test insert object with has_one relation eager", "[session][insert][has_one][eager]") {
+  const auto result = schema.attach<country_identity>("countries")
+    .and_then( [this] { return schema.attach<capital_identity>("capitals"); } )
+    .and_then([this] { return schema.create(db); } );
+  REQUIRE(result.is_ok());
+
+  session ses({bus, connection::dns, 4}, schema);
+
+  const auto ger = make_object<country_identity>("Germany");
+  auto ger_cap = make_object<capital_identity>("Berlin", ger);
+
+  REQUIRE(ger.is_transient());
+  REQUIRE(ger_cap.is_transient());
+  REQUIRE(ses.insert(ger_cap).is_ok());
+  REQUIRE(ger_cap.is_persistent());
+  REQUIRE(ger.is_persistent());
+
+  const auto ger_result = ses.find<country_identity>(ger->id);
+  REQUIRE(ger_result.is_ok());
+  ger_cap = ger_result.value()->capital;
+  REQUIRE(ger_cap->name == "Berlin");
 }