fixed insert_step_processor

test/backends/SessionInsertBelongsTo.cpp

@@ -25,7 +25,8 @@ TEST_CASE_METHOD(SessionFixture, "Test insert object with belongs to relation wi
   const auto carrie = make_object<book_identity>("Carrie", s_king, 1974);
 
   REQUIRE(carrie.is_transient());
-  REQUIRE(ses.insert(carrie).is_ok());
+  const auto res = ses.insert(carrie);
+  REQUIRE(res.is_ok());
   REQUIRE(carrie.is_persistent());
 
   auto found_author = ses.find<author_identity>(s_king->id);

test/backends/SessionInsertHasMany.cpp

@@ -61,6 +61,16 @@ void validate_author_state(const object_ptr<AuthorType>& ptr, object_state expec
   }
 }
 
+namespace matador::utils {
+template < typename ValueType >
+std::ostream& operator<<(std::ostream& os, const result<ValueType, error>& value) {
+  if (value) {
+    return os;
+  }
+  return os << "Error: " << value.err();
+}
+}
+
 TEST_CASE_METHOD(SessionFixture, "Test insert object with has many relation", "[session][insert][has_many]") {
   const auto result = schema.attach<book>("books")
     .and_then( [this] { return schema.attach<author>("authors"); } )
@@ -79,7 +89,7 @@ TEST_CASE_METHOD(SessionFixture, "Test insert object with has many relation", "[
 
   validate_author_state(s_king, object_state::Transient);
   auto res = ses.insert(s_king);
-  REQUIRE(res.is_ok());
+  REQUIRE(res);
   validate_author_state(s_king, object_state::Persistent);
 }