diff --git a/backends/postgres/test/CMakeLists.txt b/backends/postgres/test/CMakeLists.txt
index 8d52bc1..abb4857 100644
--- a/backends/postgres/test/CMakeLists.txt
+++ b/backends/postgres/test/CMakeLists.txt
@@ -10,9 +10,6 @@ configure_file(Connection.hpp.in ${PROJECT_BINARY_DIR}/backends/postgres/test/co
 message(STATUS "postgresql connection string: ${POSTGRES_CONNECTION_STRING}")
 
 set(TEST_SOURCES
-  ../../../test/models/coordinate.hpp
-  ../../../test/models/location.hpp
-  ../../../test/models/types.hpp
   ../../../test/backends/ColorEnumTraits.cpp
   ../../../test/backends/ColorEnumTraits.hpp
   ../../../test/backends/ConnectionTest.cpp
@@ -25,23 +22,30 @@ set(TEST_SOURCES
   ../../../test/backends/SchemaFixture.cpp
   ../../../test/backends/SchemaFixture.hpp
   ../../../test/backends/SchemaTest.cpp
+  ../../../test/backends/SequenceFixture.cpp
+  ../../../test/backends/SequenceFixture.hpp
+  ../../../test/backends/SequenceTest.cpp
   ../../../test/backends/SessionFixture.cpp
   ../../../test/backends/SessionFixture.hpp
+  ../../../test/backends/SessionInsertBelongsTo.cpp
+  ../../../test/backends/SessionInsertHasMany.cpp
+  ../../../test/backends/SessionInsertHasManyToManyTest.cpp
+  ../../../test/backends/SessionInsertHasOne.cpp
   ../../../test/backends/SessionTest.cpp
   ../../../test/backends/StatementCacheTest.cpp
   ../../../test/backends/StatementTest.cpp
-  ../../../test/backends/TypeTraitsTest.cpp
-  ../../../test/utils/record_printer.hpp
-  ../../../test/utils/record_printer.cpp
-  ../../../test/models/model_metas.hpp
-  ../../../test/backends/SequenceFixture.hpp
-  ../../../test/backends/SequenceFixture.cpp
-  ../../../test/backends/SequenceTest.cpp
-  ../../../test/backends/TableSequenceFixture.hpp
   ../../../test/backends/TableSequenceFixture.cpp
+  ../../../test/backends/TableSequenceFixture.hpp
   ../../../test/backends/TableSequenceTest.cpp
-  ../../../test/backends/SessionInsertHasMany.cpp
-  ../../../test/backends/SessionInsertHasManyToManyTest.cpp
+  ../../../test/backends/TypeTraitsTest.cpp
+  ../../../test/models/author.hpp
+  ../../../test/models/coordinate.hpp
+  ../../../test/models/location.hpp
+  ../../../test/models/model_metas.hpp
+  ../../../test/models/types.hpp
+  ../../../test/models/user.hpp
+  ../../../test/utils/record_printer.cpp
+  ../../../test/utils/record_printer.hpp
 )
 
 set(LIBRARY_TEST_TARGET PostgresTests)
diff --git a/include/matador/utils/access.hpp b/include/matador/utils/access.hpp
index 7b85907..c4403dd 100644
--- a/include/matador/utils/access.hpp
+++ b/include/matador/utils/access.hpp
@@ -1,5 +1,5 @@
-#ifndef OOS_ACCESS_HPP
-#define OOS_ACCESS_HPP
+#ifndef MATADOR_ACCESS_HPP
+#define MATADOR_ACCESS_HPP
 
 #include "matador/utils/primary_key_attribute.hpp"
 #include "matador/utils/field_attributes.hpp"
@@ -7,17 +7,7 @@
 
 #include <optional>
 
-namespace matador {
-
-enum class cascade_type;
-
-namespace utils {
-class field_attributes;
-class foreign_attributes;
-class primary_key_attribute;
-}
-
-namespace access {
+namespace matador::access {
 template<class Operator, class Type>
 void process(Operator &op, Type &object) {
   object.process(op);
@@ -92,6 +82,5 @@ void has_many_to_many(Operator &op, const char *id, ContainerType &c, const util
   op.on_has_many_to_many(id, c, attr);
 }
 }
-}
 
-#endif //OOS_ACCESS_HPP
+#endif //MATADOR_ACCESS_HPP
diff --git a/test/backends/SessionInsertBelongsTo.cpp b/test/backends/SessionInsertBelongsTo.cpp
new file mode 100644
index 0000000..577d641
--- /dev/null
+++ b/test/backends/SessionInsertBelongsTo.cpp
@@ -0,0 +1,80 @@
+#include "catch2/catch_test_macros.hpp"
+
+#include "SessionFixture.hpp"
+
+#include "connection.hpp"
+
+#include "matador/query/session.hpp"
+
+#include "models/author.hpp"
+
+using namespace matador::test;
+using namespace matador::query;
+using namespace matador::object;
+
+TEST_CASE_METHOD(SessionFixture, "Test insert object with belongs to relation with identity", "[session][insert][belongs_to][identity]") {
+  const auto result = schema.attach<book_identity>("books")
+    .and_then( [this] { return schema.attach<author_identity>("authors"); } )
+    .and_then([this] { return schema.create(db); } );
+  REQUIRE(result.is_ok());
+
+  session ses({bus, connection::dns, 4}, schema);
+
+  auto s_king = make_object<author_identity>("Steven King");
+
+  const auto carrie = make_object<book_identity>("Carrie", s_king, 1974);
+
+  REQUIRE(carrie.is_transient());
+  REQUIRE(ses.insert(carrie).is_ok());
+  REQUIRE(carrie.is_persistent());
+
+  auto found_author = ses.find<author_identity>(s_king->id);
+  REQUIRE(found_author);
+  REQUIRE(found_author.value()->name == "Steven King");
+  REQUIRE(found_author.value()->books.size() == 1);
+}
+
+TEST_CASE_METHOD(SessionFixture, "Test insert object with belongs to relation with table sequence", "[session][insert][belongs_to][table_sequence]") {
+  const auto result = schema.attach<book_table>("books")
+    .and_then( [this] { return schema.attach<author_table>("authors"); } )
+    .and_then([this] { return schema.create(db); } );
+  REQUIRE(result.is_ok());
+
+  session ses({bus, connection::dns, 4}, schema);
+
+  auto s_king = make_object<author_table>("Steven King");
+
+  const auto carrie = make_object<book_table>("Carrie", s_king, 1974);
+
+  REQUIRE(carrie.is_transient());
+  REQUIRE(ses.insert(carrie).is_ok());
+  REQUIRE(carrie.is_persistent());
+
+  auto found_author = ses.find<author_table>(s_king->id);
+  REQUIRE(found_author);
+  REQUIRE(found_author.value()->name == "Steven King");
+  REQUIRE(found_author.value()->books.size() == 1);
+}
+
+TEST_CASE_METHOD(SessionFixture, "Test insert object with belongs to relation with sequence", "[session][insert][belongs_to][sequence]") {
+  const auto result = schema.attach<book_sequence>("books")
+    .and_then( [this] { return schema.attach<author_sequence>("authors"); } )
+    .and_then([this] { return schema.create(db); } );
+  REQUIRE(result.is_ok());
+
+  session ses({bus, connection::dns, 4}, schema);
+
+  auto s_king = make_object<author_sequence>("Steven King");
+
+  const auto carrie = make_object<book_sequence>("Carrie", s_king, 1974);
+
+  REQUIRE(carrie.is_transient());
+  REQUIRE(ses.insert(carrie).is_ok());
+  REQUIRE(carrie.is_persistent());
+
+  auto found_author = ses.find<author_sequence>(s_king->id);
+  REQUIRE(found_author);
+  REQUIRE(found_author.value()->name == "Steven King");
+  REQUIRE(found_author.value()->books.size() == 1);
+}
+
diff --git a/test/backends/SessionInsertHasMany.cpp b/test/backends/SessionInsertHasMany.cpp
index 8ec8915..1ed52f8 100644
--- a/test/backends/SessionInsertHasMany.cpp
+++ b/test/backends/SessionInsertHasMany.cpp
@@ -15,56 +15,6 @@ using namespace matador::object;
 using namespace matador::test;
 
 namespace matador::test {
-template<const utils::primary_key_attribute &PkAttribute>
-struct book_pk_generator;
-
-template<const utils::primary_key_attribute &PkAttribute>
-struct author_pk_generator {
-  unsigned int id{};
-  std::string name;
-  collection<object_ptr<book_pk_generator<PkAttribute>>> books;
-
-  author_pk_generator() = default;
-  explicit author_pk_generator(std::string name)
-  : name(std::move(name)) {}
-
-  template<typename Operator>
-  void process(Operator &op) {
-    namespace field = matador::access;
-    field::primary_key(op, "id", id, PkAttribute);
-    field::attribute(op, "name", name, VarChar63);
-    field::has_many(op, "books", books, "author_id", utils::CascadeAllFetchLazy);
-  }
-};
-
-template<const utils::primary_key_attribute &PkAttribute>
-struct book_pk_generator {
-  unsigned int id{};
-  std::string title;
-  object_ptr<author_pk_generator<PkAttribute>> book_author;
-  unsigned short published_in{};
-
-  book_pk_generator() = default;
-  book_pk_generator(std::string title, object_ptr<author_pk_generator<PkAttribute>> author, const unsigned short published_in)
-  : title(std::move(title)), book_author(std::move(author)), published_in(published_in) {}
-
-  template<typename Operator>
-  void process(Operator &op) {
-    namespace field = matador::access;
-    field::primary_key(op, "id", id, PkAttribute);
-    field::attribute(op, "title", title, VarChar511);
-    field::belongs_to(op, "author_id", book_author, utils::CascadeAllFetchEager);
-    field::attribute(op, "published_in", published_in);
-  }
-};
-
-using author_identity = author_pk_generator<utils::Identity>;
-using author_sequence = author_pk_generator<utils::Sequence>;
-using author_table = author_pk_generator<utils::Table>;
-using book_identity = book_pk_generator<utils::Identity>;
-using book_sequence = book_pk_generator<utils::Sequence>;
-using book_table = book_pk_generator<utils::Table>;
-
 template<const utils::primary_key_attribute &PkAttribute>
 struct colorlist_pk_generator {
   unsigned int id{};
@@ -88,7 +38,6 @@ struct colorlist_pk_generator {
 using colorlist_identity = colorlist_pk_generator<utils::Identity>;
 using colorlist_sequence = colorlist_pk_generator<utils::Sequence>;
 using colorlist_table = colorlist_pk_generator<utils::Table>;
-
 }
 
 template<typename AuthorType, typename BookType>
diff --git a/test/backends/SessionInsertHasManyToManyTest.cpp b/test/backends/SessionInsertHasManyToManyTest.cpp
index 61d4f49..9af5e75 100644
--- a/test/backends/SessionInsertHasManyToManyTest.cpp
+++ b/test/backends/SessionInsertHasManyToManyTest.cpp
@@ -30,6 +30,10 @@ struct ingredient_pk_generator {
   : name(std::move(name)) {
   }
 
+  ingredient_pk_generator(std::string name, std::vector<object_ptr<recipe_pk_generator<PkAttribute>>> recps)
+  : name(std::move(name))
+  , recipes(std::move(recps)){}
+
   template<class Operator>
   void process(Operator &op) {
     namespace field = matador::access;
@@ -51,8 +55,7 @@ struct recipe_pk_generator {
   }
   recipe_pk_generator(std::string name, std::vector<object_ptr<ingredient_pk_generator<PkAttribute>>> ings)
   : name(std::move(name))
-  , ingredients(std::move(ings)){
-  }
+  , ingredients(std::move(ings)){}
 
   template<class Operator>
   void process(Operator &op) {
@@ -218,3 +221,43 @@ TEST_CASE_METHOD(SessionFixture, "Test insert object with has many to many relat
   REQUIRE(ing_result.is_ok());
   REQUIRE(ing_result.value()->recipes.size() == 2);
 }
+
+TEST_CASE_METHOD(SessionFixture, "Test insert object with has many to many relation sequence reverse", "[session][insert][sequence][has_many_to_many][reverse]") {
+  auto result = schema.attach<recipe_sequence>("recipes")
+    .and_then( [this] { return schema.attach<ingredient_sequence>("ingredients"); } )
+    .and_then([this] { return schema.create(db); } );
+
+  query::session ses({bus, connection::dns, 4}, schema);
+
+  std::vector recipes {
+    make_object<recipe_sequence>("Apple Pie"),
+    make_object<recipe_sequence>("Strawberry Cake"),
+    make_object<recipe_sequence>("Pineapple Pie")
+  };
+
+  std::vector ingredients {
+    make_object<ingredient_sequence>("Apple", std::vector{recipes[0], recipes[2]}),
+    make_object<ingredient_sequence>("Strawberry", std::vector{recipes[2]}),
+    make_object<ingredient_sequence>("Pineapple", std::vector{recipes[2]}),
+    make_object<ingredient_sequence>("Sugar", std::vector{recipes[0]}),
+    make_object<ingredient_sequence>("Flour", std::vector{recipes[0]}),
+    make_object<ingredient_sequence>("Butter", std::vector{recipes[1]}),
+    make_object<ingredient_sequence>("Beans", std::vector{recipes[1]})
+  };
+
+  for (auto &i: ingredients) {
+    REQUIRE(i.is_transient());
+    auto res = ses.insert(i);
+    REQUIRE(res.is_ok());
+    REQUIRE(res->is_persistent());
+  }
+
+  auto recipe_result = ses.find<ingredient_sequence>(1);
+  REQUIRE(recipe_result.is_ok());
+  REQUIRE(recipe_result->is_persistent());
+  REQUIRE(recipe_result.value()->recipes.size() == 2);
+
+  const auto ing_result = ses.find<recipe_sequence>(recipes[0]->id);
+  REQUIRE(ing_result.is_ok());
+  REQUIRE(ing_result.value()->ingredients.size() == 3);
+}
diff --git a/test/backends/SessionInsertHasOne.cpp b/test/backends/SessionInsertHasOne.cpp
new file mode 100644
index 0000000..7f870a4
--- /dev/null
+++ b/test/backends/SessionInsertHasOne.cpp
@@ -0,0 +1,22 @@
+#include "catch2/catch_test_macros.hpp"
+
+#include "SessionFixture.hpp"
+
+#include "connection.hpp"
+
+#include "matador/query/session.hpp"
+
+#include "models/user.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]") {
+  session sess{conn};
+  user_pk_generator u;
+  u.name = "John Doe";
+  sess.persist(u);
+
+  REQUIRE(u.id > 0);
+}
\ No newline at end of file
diff --git a/test/models/author.hpp b/test/models/author.hpp
index e4ee05f..eb372c5 100644
--- a/test/models/author.hpp
+++ b/test/models/author.hpp
@@ -41,6 +41,57 @@ struct author {
     field::has_many(op, "books", books, "author_id", utils::CascadeAllFetchLazy);
   }
 };
+
+template<const utils::primary_key_attribute &PkAttribute>
+struct book_pk_generator;
+
+template<const utils::primary_key_attribute &PkAttribute>
+struct author_pk_generator {
+  unsigned int id{};
+  std::string name;
+  object::collection<object::object_ptr<book_pk_generator<PkAttribute>>> books;
+
+  author_pk_generator() = default;
+  explicit author_pk_generator(std::string name)
+  : name(std::move(name)) {}
+
+  template<typename Operator>
+  void process(Operator &op) {
+    namespace field = matador::access;
+    field::primary_key(op, "id", id, PkAttribute);
+    field::attribute(op, "name", name, VarChar63);
+    field::has_many(op, "books", books, "author_id", utils::CascadeAllFetchLazy);
+  }
+};
+
+template<const utils::primary_key_attribute &PkAttribute>
+struct book_pk_generator {
+  unsigned int id{};
+  std::string title;
+  object::object_ptr<author_pk_generator<PkAttribute>> book_author;
+  unsigned short published_in{};
+
+  book_pk_generator() = default;
+  book_pk_generator(std::string title, object::object_ptr<author_pk_generator<PkAttribute>> author, const unsigned short published_in)
+  : title(std::move(title)), book_author(std::move(author)), published_in(published_in) {}
+
+  template<typename Operator>
+  void process(Operator &op) {
+    namespace field = matador::access;
+    field::primary_key(op, "id", id, PkAttribute);
+    field::attribute(op, "title", title, VarChar511);
+    field::belongs_to(op, "author_id", book_author, utils::CascadeAllFetchEager);
+    field::attribute(op, "published_in", published_in);
+  }
+};
+
+using author_identity = author_pk_generator<utils::Identity>;
+using author_sequence = author_pk_generator<utils::Sequence>;
+using author_table = author_pk_generator<utils::Table>;
+using book_identity = book_pk_generator<utils::Identity>;
+using book_sequence = book_pk_generator<utils::Sequence>;
+using book_table = book_pk_generator<utils::Table>;
+
 }
 
 #endif //QUERY_AUTHOR_HPP
diff --git a/test/models/user.hpp b/test/models/user.hpp
new file mode 100644
index 0000000..b42d061
--- /dev/null
+++ b/test/models/user.hpp
@@ -0,0 +1,56 @@
+#ifndef MATADOR_USER_HPP
+#define MATADOR_USER_HPP
+
+#include "matador/utils/access.hpp"
+
+#include "matador/object/object_ptr.hpp"
+
+#include <string>
+
+namespace matador::test {
+template<const utils::primary_key_attribute &PkAttribute>
+struct user_session_pk_generator;
+
+template<const utils::primary_key_attribute &PkAttribute>
+struct user_pk_generator {
+  unsigned int id{};
+  std::string name;
+  object::object_ptr<user_session_pk_generator<PkAttribute>> session;
+
+  template<class Operator>
+  void process(Operator &op) {
+    namespace field = matador::access;
+    using namespace matador::utils;
+    field::primary_key(op, "id", id);
+    field::attribute(op, "name", name, UniqueVarChar255);
+    field::has_one(op, "session", session, CascadeAllFetchLazy);
+  }
+};
+
+template<const utils::primary_key_attribute &PkAttribute>
+struct user_session_pk_generator {
+  unsigned int id{};
+  std::string session_token;
+  object::object_ptr<user_pk_generator<PkAttribute>> user_;
+
+  template<class Operator>
+  void process(Operator &op) {
+    namespace field = matador::access;
+    using namespace matador::utils;
+    field::primary_key(op, "id", id);
+    field::attribute(op, "session_token", session_token, VarChar255);
+    field::belongs_to(op, "user_id", user_, CascadeAllFetchLazy);
+  }
+};
+
+using user = user_pk_generator<utils::Manual>;
+using user_identity = user_pk_generator<utils::Identity>;
+using user_sequence = user_pk_generator<utils::Sequence>;
+using user_table = user_pk_generator<utils::Table>;
+using user_session = user_session_pk_generator<utils::Manual>;
+using user_session_identity = user_session_pk_generator<utils::Identity>;
+using user_session_sequence = user_session_pk_generator<utils::Sequence>;
+using user_session_table = user_session_pk_generator<utils::Table>;
+}
+
+#endif //MATADOR_USER_HPP