renamed constraint to restriction

include/matador/object/basic_object_info.hpp

@@ -2,7 +2,7 @@
 #define BASIC_PROTOTYPE_INFO_HPP
 
 #include "matador/object/attribute.hpp"
-#include "matador/object/constraint.hpp"
+#include "matador/object/restriction.hpp"
 #include "matador/object/relation_endpoint.hpp"
 
 #include "matador/utils/identifier.hpp"
@@ -26,15 +26,15 @@ public:
 
   [[nodiscard]] std::type_index type_index() const;
   [[nodiscard]] std::string name() const;
-  [[nodiscard]] const class object& object() const;
+  [[nodiscard]] std::shared_ptr<class object> object() const;
   [[nodiscard]] const std::list<attribute>& attributes() const;
-  [[nodiscard]] const std::list<class constraint>& constraints() const;
+  [[nodiscard]] const std::list<class restriction>& constraints() const;
 
   [[nodiscard]] bool has_primary_key() const;
   [[nodiscard]] const utils::identifier& primary_key() const;
   [[nodiscard]]  attribute* primary_key_attribute() const;
 
-  void update_name(const std::string& name);
+  void update_name(const std::string& name) const;
 
   endpoint_iterator register_relation_endpoint(const std::type_index &type, const std::shared_ptr<relation_endpoint> &endpoint);
   void unregister_relation_endpoint(const std::type_index &type);
@@ -55,10 +55,10 @@ public:
   [[nodiscard]] bool endpoints_empty() const;
 
 protected:
-  basic_object_info(std::shared_ptr<repository_node> node, std::unique_ptr<class object> &&obj);
+  basic_object_info(std::shared_ptr<repository_node> node, std::shared_ptr<class object> &&obj);
 
 protected:
-  std::unique_ptr<class object> object_;
+  std::shared_ptr<class object> object_;
   std::shared_ptr<repository_node> node_;            /**< prototype node of the represented object type */
   t_endpoint_map relation_endpoints_;
 };

include/matador/object/constraints_generator.hpp

@@ -1,7 +1,7 @@
 #ifndef MATADOR_CONSTRAINTS_GENERATOR_HPP
 #define MATADOR_CONSTRAINTS_GENERATOR_HPP
 
-#include "matador/object/constraint.hpp"
+#include "matador/object/restriction.hpp"
 
 #include "matador/utils/access.hpp"
 #include "matador/utils/field_attributes.hpp"
@@ -17,20 +17,20 @@ class repository;
 
 class constraints_generator final {
 private:
-    constraints_generator(std::list<class constraint> &constraints, const repository &repo, object &obj);
+    constraints_generator(std::list<class restriction> &constraints, const repository &repo, const std::shared_ptr<object> &obj);
 
 public:
     constraints_generator() = delete;
 
     template < typename Type >
-    static std::list<class constraint> generate(const repository &repo, object &obj) {
+    static std::list<class restriction> generate(const repository &repo, const std::shared_ptr<object> &obj) {
         Type t;
         return generate(t, repo, obj);
     }
 
     template < typename Type >
-    static std::list<class constraint> generate(const Type& t, const repository &repo, object &obj) {
-        std::list<class constraint> constraints;
+    static std::list<class restriction> generate(const Type& t, const repository &repo, const std::shared_ptr<object> &obj) {
+        std::list<class restriction> constraints;
         constraints_generator gen(constraints, repo, obj);
         access::process(gen, t);
         return constraints;
@@ -69,9 +69,9 @@ private:
     [[nodiscard]] std::list<attribute>::iterator find_attribute_by_name(const std::string &name) const;
 
 private:
-    std::list<class constraint> &constraints_;
+    std::list<class restriction> &constraints_;
     const repository &repo_;
-    object &obj_;
+    std::shared_ptr<object> obj_;
 };
 }
 

include/matador/object/object.hpp

@@ -2,7 +2,7 @@
 #define MATADOR_OBJECT_HPP
 
 #include "matador/object/attribute.hpp"
-#include "matador/object/constraint.hpp"
+#include "matador/object/restriction.hpp"
 
 #include "matador/utils/identifier.hpp"
 
@@ -19,8 +19,8 @@ public:
 
   static const attribute& create_attribute(std::string name, object& obj);
 
-  void add_attribute(attribute attr);
-  void add_constraint(class constraint c);
+  // void add_attribute(attribute attr);
+  // void add_constraint(class constraint c);
 
   [[nodiscard]] attribute* primary_key_attribute() const;
   [[nodiscard]] const utils::identifier& primary_key() const;
@@ -37,7 +37,7 @@ public:
 
   [[nodiscard]] bool has_constraints() const;
   [[nodiscard]] size_t constraint_count() const;
-  [[nodiscard]] const std::list<class constraint>& constraints() const;
+  [[nodiscard]] const std::list<class restriction>& constraints() const;
 
   friend std::ostream& operator<<(std::ostream& os, const object& obj);
 
@@ -52,7 +52,7 @@ private:
   attribute* pk_attribute_{nullptr};
   utils::identifier pk_identifier_;
   std::list<attribute> attributes_;
-  std::list<class constraint> constraints_;
+  std::list<class restriction> constraints_;
 };
 }
 #endif //MATADOR_OBJECT_HPP

include/matador/object/object_generator.hpp

@@ -50,23 +50,22 @@ private:
 
 class object_generator {
 private:
-    explicit object_generator(const repository& repo, std::unique_ptr<object> &&object);
+    explicit object_generator(repository& repo, const std::shared_ptr<object> &object);
 
 public:
     template < class Type >
-    static std::unique_ptr<object> generate(const repository &repo, const std::string &name, const std::string &alias = "") {
+    static std::shared_ptr<object> generate(repository &repo, const std::string &name, const std::string &alias = "") {
         return generate(std::make_unique<Type>(), repo, name, alias);
     }
 
     template < class Type >
-    static std::unique_ptr<object> generate(std::unique_ptr<Type>&& t, const repository &repo, const std::string &name, const std::string &alias = "") {
-        object_generator gen(repo, std::make_unique<object>(name, alias));
+    static std::shared_ptr<object> generate(std::unique_ptr<Type>&& t, repository &repo, const std::string &name, const std::string &alias = "") {
+        auto obj = std::make_shared<object>(name, alias);
+        object_generator gen(repo, obj);
         access::process(gen, *t);
-        return gen.move();
+        return obj;
     }
 
-    [[nodiscard]] std::unique_ptr<object> move() { return std::move(object_); }
-
     template < class Type >
     void on_primary_key(const char *, Type &x, const utils::primary_key_attribute& attr = utils::default_pk_attributes);
     void on_revision(const char *id, uint64_t &rev);
@@ -114,9 +113,11 @@ private:
 
     void prepare_primary_key(attribute &ref, utils::identifier &&pk) const;
 
+    std::shared_ptr<class object> fk_object(const std::type_index& ti) const;
+
 private:
-    const repository &repo_;
-    std::unique_ptr<object> object_;
+    repository &repo_;
+    std::shared_ptr<object> object_;
 };
 
 template<typename ValueType>

include/matador/object/object_info.hpp

@@ -14,7 +14,7 @@ public:
   using create_func = std::function<std::unique_ptr<Type>()>;
 
   object_info(const std::shared_ptr<repository_node>& node,
-              std::unique_ptr<class object> &&obj,
+              std::shared_ptr<class object> &&obj,
               create_func&& creator)
   : basic_object_info(node, std::move(obj))
   , creator_(std::move(creator)){

include/matador/object/repository.hpp

@@ -177,16 +177,22 @@ private:
   static void insert_node(const node_ptr &parent, const node_ptr &child);
   void remove_node(const node_ptr &node);
 
-  bool expecting_relation_node(const std::string &name) const;
+  [[nodiscard]] bool expecting_relation_node(const std::string &name) const;
   void expect_relation_node(const std::string &name, const std::type_index &ti);
   void remove_expected_relation_node(const std::string &name);
 
+  [[nodiscard]] std::shared_ptr<object> provide_object_in_advance(const std::type_index &ti, const std::shared_ptr<object>& obj);
+  [[nodiscard]] bool has_object_for_type(const std::type_index &ti) const;
+  [[nodiscard]] std::shared_ptr<object> object_for_type(const std::type_index &ti) const;
+  void remove_object_for_type(const std::type_index &ti);
+
 private:
   friend class internal::shadow_repository;
   friend class repository_node;
   friend class attribute_generator;
   template < typename NodeType >
   friend class foreign_node_completer;
+  friend class object_generator;
 
   std::string name_;
   std::shared_ptr<repository_node> root_;
@@ -197,6 +203,7 @@ private:
 
   std::unordered_map<std::type_index, attribute*> missing_references_;
   std::unordered_map<std::string, std::type_index> expected_relation_nodes_;
+  std::unordered_map<std::type_index, std::shared_ptr<object>> object_by_type_;
 };
 }
 

include/matador/object/restriction.hpp

@@ -15,22 +15,22 @@ class constraint_builder;
 class constraint_generator;
 class object;
 
-class constraint {
+class restriction {
 public:
-  constraint() = default;
-  explicit constraint(std::string name);
+  restriction() = default;
+  explicit restriction(std::string name);
 
   [[nodiscard]] const std::string& name() const;
   [[nodiscard]] const class attribute* attribute() const;
   [[nodiscard]] std::string column_name() const;
-  [[nodiscard]] const object* owner() const;
+  [[nodiscard]] std::shared_ptr<object> owner() const;
   [[nodiscard]] bool is_primary_key_constraint() const;
   [[nodiscard]] bool is_foreign_key_constraint() const;
   [[nodiscard]] bool is_unique_constraint() const;
   [[nodiscard]] const std::string& ref_table_name() const;
   [[nodiscard]] const std::string& ref_column_name() const;
 
-  friend std::ostream& operator<<(std::ostream& os, const constraint& c);
+  friend std::ostream& operator<<(std::ostream& os, const restriction& c);
 
 private:
   friend class constraint_builder;
@@ -40,7 +40,8 @@ private:
 
   std::string name_;
   std::variant<class attribute*, std::string> attr_;
-  object *owner_{nullptr};
+  std::shared_ptr<object> owner_;
+  std::shared_ptr<object> reference_;
   utils::constraints options_{utils::constraints::None};
   std::string ref_table_name_{};
   std::string ref_column_name_{};
@@ -53,12 +54,11 @@ public:
   constraint_builder& foreign_key(std::string name);
   constraint_builder& references(std::string table, std::string column);
 
-  operator class constraint() const;
+  operator class restriction() const;
 
 private:
   std::string constraint_name;
   utils::constraints options_{utils::constraints::None};
-  std::shared_ptr<object> reference_;
   std::string column_name;
   std::string ref_table_name;
   std::string ref_column_name;

include/matador/orm/schema.hpp

@@ -52,8 +52,8 @@ public:
   [[nodiscard]] utils::result<bool, utils::error> table_exists(const std::string &table_name) const;
 
 private:
-   sql::query_context build_add_constraint_context( const object::repository_node& node, const class object::constraint& cons ) const;
-   sql::query_context build_drop_constraint_context( const object::repository_node& node, const class object::constraint& cons ) const;
+   sql::query_context build_add_constraint_context( const object::repository_node& node, const class object::restriction& cons ) const;
+   sql::query_context build_drop_constraint_context( const object::repository_node& node, const class object::restriction& cons ) const;
 
 private:
   object::repository repo_;

include/matador/orm/session.hpp

@@ -145,7 +145,7 @@ private:
   friend class query_select;
 
   static query::fetchable_query build_select_query(entity_query_data &&data);
-  static sql::query_context build_add_constraint_context(const std::string& table_name, const class object::constraint& cons, const sql::connection_ptr &conn) ;
+  static sql::query_context build_add_constraint_context(const std::string& table_name, const class object::restriction& cons, const sql::connection_ptr &conn) ;
 
 private:
   mutable sql::statement_cache cache_;

include/matador/query/builder.hpp

@@ -64,9 +64,9 @@ using Boolean = typed_data_type<bool>;
 using Varchar = sized_typed_data_type<std::string>;
 using Blob = sized_typed_data_type<std::vector<std::byte>>;
 
-class constraint {
+class restriction {
 public:
-    explicit constraint(std::string name)
+    explicit restriction(std::string name)
     : name_(std::move(name)) {}
 
     [[nodiscard]] const std::string& name() const;
@@ -126,7 +126,7 @@ public:
   constraint_builder& references(std::string table, std::string column);
 
   // ReSharper disable once CppNonExplicitConversionOperator
-  operator object::constraint() const; // NOLINT(*-explicit-constructor)
+  operator object::restriction() const; // NOLINT(*-explicit-constructor)
 
 private:
   std::string constraint_name;

include/matador/query/column.hpp

@@ -21,7 +21,7 @@ public:
 
   [[nodiscard]] bool equals(const column &x) const;
 
-  column& as(std::string a);
+  column as(std::string a);
 
   [[nodiscard]] const std::string& name() const;
   [[nodiscard]] const std::string& alias() const;
@@ -33,7 +33,8 @@ public:
   [[nodiscard]] std::shared_ptr<class table> table() const;
   void table(const std::shared_ptr<query::table>& t);
 
-  operator const std::string&() const;
+  // ReSharper disable once CppNonExplicitConversionOperator
+  operator const std::string&() const; // NOLINT(*-explicit-constructor)
 
 private:
   std::shared_ptr<query::table> table_;

include/matador/query/intermediates/query_alter_table_intermediate.hpp

@@ -2,7 +2,7 @@
 #define MATADOR_QUERY_ALTER_TABLE_INTERMEDIATE_HPP
 
 #include "executable_query.hpp"
-#include "matador/object/constraint.hpp"
+#include "matador/object/restriction.hpp"
 #include "matador/query/intermediates/query_intermediate.hpp"
 
 namespace matador::query {

include/matador/query/intermediates/query_create_intermediate.hpp

@@ -6,7 +6,7 @@
 #include "matador/query/intermediates/executable_query.hpp"
 
 #include "matador/object/attribute.hpp"
-#include "matador/object/constraint.hpp"
+#include "matador/object/restriction.hpp"
 
 #include <list>
 
@@ -16,8 +16,8 @@ class query_create_table_columns_intermediate : public executable_query {
 public:
   using executable_query::executable_query;
 
-  executable_query constraints(std::initializer_list<class object::constraint> constraints);
-  executable_query constraints(const std::list<class object::constraint> &constraints);
+  executable_query constraints(std::initializer_list<class object::restriction> constraints);
+  executable_query constraints(const std::list<class object::restriction> &constraints);
 };
 
 class query_create_table_intermediate : public query_intermediate {
@@ -26,6 +26,8 @@ public:
 
   query_create_table_columns_intermediate columns(std::initializer_list<object::attribute> columns);
   query_create_table_columns_intermediate columns(const std::list<object::attribute> &columns);
+  query_create_table_columns_intermediate columns(std::initializer_list<column> columns);
+  query_create_table_columns_intermediate columns(const std::list<column> &columns);
 };
 
 class query_create_intermediate : public query_intermediate {

include/matador/query/internal/query_parts.hpp

@@ -10,7 +10,7 @@
 #include "matador/query/table.hpp"
 
 #include "matador/object/attribute.hpp"
-#include "matador/object/constraint.hpp"
+#include "matador/object/restriction.hpp"
 
 #include "matador/utils/placeholder.hpp"
 
@@ -392,15 +392,15 @@ private:
 
 class query_create_table_constraints_part final : public query_part {
 public:
-  explicit query_create_table_constraints_part(const std::list<class object::constraint> &constraints);
+  explicit query_create_table_constraints_part(const std::list<class object::restriction> &constraints);
 
-  [[nodiscard]] const std::list<class object::constraint>& constraints() const;
+  [[nodiscard]] const std::list<class object::restriction>& constraints() const;
 
 private:
   void accept(query_part_visitor &visitor) override;
 
 private:
-  std::list<class object::constraint> constraints_;
+  std::list<class object::restriction> constraints_;
 };
 
 class query_create_schema_part final : public query_part {

include/matador/query/table.hpp

@@ -10,6 +10,7 @@ namespace matador::query {
 
 class column;
 
+// ReSharper disable CppNonExplicitConvertingConstructor
 class table {
 public:
   table() = default;
@@ -18,7 +19,7 @@ public:
   table(std::string name, std::string as);
   table(std::string name, std::string as, const std::vector<class column> &columns);
 
-  table& as(const std::string &a);
+  table as(const std::string &a);
 
   [[nodiscard]] bool operator==(const table &x) const;
 
@@ -30,9 +31,8 @@ public:
   [[nodiscard]] const std::string& alias() const;
   [[nodiscard]] const std::vector<class column>& columns() const;
 
-  // [[nodiscard]] class column column(const std::string &name) const;
-
-  operator const std::vector<query::column>&() const;
+  // ReSharper disable once CppNonExplicitConversionOperator
+  operator const std::vector<query::column>&() const; // NOLINT(*-explicit-constructor)
 private:
   friend class column;
 

source/core/CMakeLists.txt

@@ -16,13 +16,13 @@ add_library(matador-core STATIC
   ../../include/matador/object/attribute.hpp
   ../../include/matador/object/attribute_generator.hpp
   ../../include/matador/object/basic_object_info.hpp
-  ../../include/matador/object/constraint.hpp
   ../../include/matador/object/constraints_generator.hpp
   ../../include/matador/object/error_code.hpp
   ../../include/matador/object/foreign_node_completer.hpp
   ../../include/matador/object/internal/shadow_repository.hpp
   ../../include/matador/object/many_to_many_relation.hpp
   ../../include/matador/object/object.hpp
+  ../../include/matador/object/object_generator.hpp
   ../../include/matador/object/object_info.hpp
   ../../include/matador/object/object_proxy.hpp
   ../../include/matador/object/object_ptr.hpp
@@ -32,6 +32,7 @@ add_library(matador-core STATIC
   ../../include/matador/object/repository.hpp
   ../../include/matador/object/repository_node.hpp
   ../../include/matador/object/repository_node_iterator.hpp
+  ../../include/matador/object/restriction.hpp
   ../../include/matador/sql/statement_cache.hpp
   ../../include/matador/utils/access.hpp
   ../../include/matador/utils/attribute_reader.hpp
@@ -80,15 +81,17 @@ add_library(matador-core STATIC
   object/attribute.cpp
   object/attribute_generator.cpp
   object/basic_object_info.cpp
-  object/constraint.cpp
   object/constraints_generator.cpp
   object/error_code.cpp
   object/foreign_node_completer.cpp
   object/internal/shadow_repository.cpp
+  object/object.cpp
+  object/object_generator.cpp
   object/relation_endpoint.cpp
   object/repository.cpp
   object/repository_node.cpp
   object/repository_node_iterator.cpp
+  object/restriction.cpp
   utils/default_type_traits.cpp
   utils/error.cpp
   utils/errors.cpp
@@ -107,9 +110,6 @@ add_library(matador-core STATIC
   utils/uuid.cpp
   utils/value.cpp
   utils/version.cpp
-  object/object.cpp
-  ../../include/matador/object/object_generator.hpp
-  object/object_generator.cpp
 )
 
 target_link_libraries(matador-core ${CMAKE_DL_LIBS})

source/core/object/basic_object_info.cpp

@@ -5,22 +5,7 @@
 #include <algorithm>
 
 namespace matador::object {
-// basic_object_info::basic_object_info(std::shared_ptr<repository_node> node,
-//                                      const std::vector<attribute> &attributes,
-//                                      utils::identifier &&pk,
-//                                      const std::shared_ptr<attribute> &pk_as_fk_column)
-// : node_(std::move(node))
-// , attributes_(attributes)
-// , identifier_(std::move(pk))
-// , pk_as_fk_column_(pk_as_fk_column) {
-// }
-//
-// basic_object_info::basic_object_info(std::shared_ptr<repository_node> node,
-//                                      const std::vector<attribute> &attributes)
-// : node_(std::move(node))
-// , attributes_(attributes) {}
-
-basic_object_info::basic_object_info(std::shared_ptr<repository_node> node, std::unique_ptr<class object>&& obj)
+basic_object_info::basic_object_info(std::shared_ptr<repository_node> node, std::shared_ptr<class object>&& obj)
     : object_(std::move(obj))
     , node_(std::move(node)) {}
 
@@ -32,15 +17,15 @@ std::string basic_object_info::name() const {
   return node_->name();
 }
 
-const class object & basic_object_info::object() const {
-  return *object_;
+std::shared_ptr<class object> basic_object_info::object() const {
+  return object_;
 }
 
 const std::list<attribute>& basic_object_info::attributes() const {
   return object_->attributes();
 }
 
-const std::list<class constraint>& basic_object_info::constraints() const {
+const std::list<class restriction>& basic_object_info::constraints() const {
   return object_->constraints();
 }
 
@@ -56,7 +41,7 @@ attribute* basic_object_info::primary_key_attribute() const {
   return object_->primary_key_attribute();
 }
 
-void basic_object_info::update_name(const std::string& name) {
+void basic_object_info::update_name(const std::string& name) const {
   object_->update_name(name);
 }
 
@@ -112,4 +97,4 @@ std::size_t basic_object_info::endpoints_size() const {
 bool basic_object_info::endpoints_empty() const {
   return relation_endpoints_.empty();
 }
-} // namespace matador::object
+}

source/core/object/constraints_generator.cpp

@@ -5,18 +5,18 @@
 #include <algorithm>
 
 namespace matador::object {
-constraints_generator::constraints_generator(std::list<class constraint> &constraints, const repository& repo, object &obj)
+constraints_generator::constraints_generator(std::list<class restriction> &constraints, const repository& repo, const std::shared_ptr<object> &obj)
 : constraints_(constraints)
 , repo_(repo)
 , obj_(obj) {}
 
 void constraints_generator::create_pk_constraint(const std::string& name) const {
-  class constraint pk_constraint("PK_" + obj_.name());
+  class restriction pk_constraint("PK_" + obj_->name());
   pk_constraint.options_ |= utils::constraints::PrimaryKey;
-  if (const auto pk_attr = find_attribute_by_name(name); pk_attr != std::end(obj_.attributes_)) {
+  if (const auto pk_attr = find_attribute_by_name(name); pk_attr != std::end(obj_->attributes_)) {
       pk_constraint.attr_ = &*pk_attr;
   }
-  pk_constraint.owner_ = &obj_;
+  pk_constraint.owner_ = obj_;
   constraints_.emplace_back(std::move(pk_constraint));
 }
 
@@ -26,28 +26,28 @@ void constraints_generator::create_fk_constraint(const std::type_index& ti, cons
     return;
   }
   const auto *pk_attribute = result.value().get().primary_key_attribute();
-  class constraint pk_constraint("FK_" + obj_.name() + "_" + name);
+  class restriction pk_constraint("FK_" + obj_->name() + "_" + name);
   pk_constraint.options_ |= utils::constraints::ForeignKey;
-  if (const auto pk_attr = find_attribute_by_name(name); pk_attr != std::end(obj_.attributes_)) {
+  if (const auto pk_attr = find_attribute_by_name(name); pk_attr != std::end(obj_->attributes_)) {
     pk_constraint.attr_ = &*pk_attr;
   }
-  pk_constraint.owner_ = &obj_;
+  pk_constraint.owner_ = obj_;
   pk_constraint.ref_column_name_ = pk_attribute->name();
   pk_constraint.ref_table_name_ = pk_attribute->owner() ? pk_attribute->owner()->name() : "";
   constraints_.emplace_back(std::move(pk_constraint));
 }
 
 void constraints_generator::create_unique_constraint(const std::string& name) const {
-  class constraint pk_constraint("UK_" + obj_.name() + "_" + name);
+  class restriction pk_constraint("UK_" + obj_->name() + "_" + name);
   pk_constraint.options_ |= utils::constraints::Unique;
-  if (const auto pk_attr = find_attribute_by_name(name); pk_attr != std::end(obj_.attributes_)) {
+  if (const auto pk_attr = find_attribute_by_name(name); pk_attr != std::end(obj_->attributes_)) {
     pk_constraint.attr_ = &*pk_attr;
   }
-  pk_constraint.owner_ = &obj_;
+  pk_constraint.owner_ = obj_;
 }
 
 std::list<attribute>::iterator constraints_generator::find_attribute_by_name(const std::string& name) const {
-  return std::find_if(std::begin(obj_.attributes_), std::end(obj_.attributes_), [&name](const attribute& elem) {
+  return std::find_if(std::begin(obj_->attributes_), std::end(obj_->attributes_), [&name](const attribute& elem) {
     return elem.name() == name;
   });
 }

source/core/object/object.cpp

@@ -11,15 +11,15 @@ const attribute& object::create_attribute( std::string name, object& obj ) {
   return obj.attributes_.emplace_back(std::move(attr));
 }
 
-void object::add_attribute( attribute attr ) {
-  auto &ref = attributes_.emplace_back(std::move(attr));
-  ref.owner_ = this;
-}
-
-void object::add_constraint( class constraint c ) {
-  auto &ref = constraints_.emplace_back(std::move(c));
-  ref.owner_ = this;
-}
+// void object::add_attribute( attribute attr ) {
+//   auto &ref = attributes_.emplace_back(std::move(attr));
+//   ref.owner_ = this;
+// }
+//
+// void object::add_constraint( class constraint c ) {
+//   auto &ref = constraints_.emplace_back(std::move(c));
+//   ref.owner_ = this;
+// }
 
 attribute* object::primary_key_attribute() const {
   return pk_attribute_;
@@ -72,7 +72,7 @@ size_t object::constraint_count() const {
   return constraints_.size();
 }
 
-const std::list<class constraint>& object::constraints() const {
+const std::list<class restriction>& object::constraints() const {
   return constraints_;
 }
 

source/core/object/object_generator.cpp

@@ -5,52 +5,48 @@
 #include <algorithm>
 
 namespace matador::object {
-object_generator::object_generator( const repository& repo, std::unique_ptr<object>&& object )
+object_generator::object_generator(repository& repo, const std::shared_ptr<object>& object)
 : repo_(repo)
-, object_(std::move(object)) {}
+, object_(object) {}
 
 void object_generator::on_revision(const char* id, uint64_t& rev) {
   on_attribute(id, rev);
 }
 
 void object_generator::create_pk_constraint(const std::string& name) const {
-    class constraint pk_constraint("PK_" + object_->name());
+    class restriction pk_constraint("PK_" + object_->name());
     pk_constraint.options_ |= utils::constraints::PrimaryKey;
     if (const auto pk_attr = find_attribute_by_name(name); pk_attr != std::end(object_->attributes_)) {
         pk_constraint.attr_ = &*pk_attr;
     }
-    pk_constraint.owner_ = object_.get();
+    pk_constraint.owner_ = object_;
     object_->constraints_.emplace_back(std::move(pk_constraint));
 }
 
 void object_generator::create_fk_constraint(const std::type_index& ti, const std::string& name) const {
-    const auto result = repo_.basic_info(ti);
-    if (!result) {
-        repo_.provide_object_in_advance(ti, std::make_shared<object>(""));
-        repo_.has_object_for_type(ti);
-        repo_.object_for_type(ti);
-        repo_.remove_object_for_type(ti);
-        return;
-    }
-    const auto *pk_attribute = result->get().primary_key_attribute();
-    class constraint pk_constraint("FK_" + object_->name() + "_" + name);
+    const auto obj = fk_object(ti);
+    const auto *pk_attribute = obj->primary_key_attribute();
+    class restriction pk_constraint("FK_" + object_->name() + "_" + name);
     pk_constraint.options_ |= utils::constraints::ForeignKey;
     if (const auto pk_attr = find_attribute_by_name(name); pk_attr != std::end(object_->attributes_)) {
         pk_constraint.attr_ = &*pk_attr;
     }
-    pk_constraint.owner_ = object_.get();
+    pk_constraint.owner_ = object_;
+    pk_constraint.reference_ = obj;
+    if (pk_attribute) {
         pk_constraint.ref_column_name_ = pk_attribute->name();
         pk_constraint.ref_table_name_ = pk_attribute->owner() ? pk_attribute->owner()->name() : "";
+    }
     object_->constraints_.emplace_back(std::move(pk_constraint));
 }
 
 void object_generator::create_unique_constraint(const std::string& name) const {
-    class constraint pk_constraint("UK_" + object_->name() + "_" + name);
+    class restriction pk_constraint("UK_" + object_->name() + "_" + name);
     pk_constraint.options_ |= utils::constraints::Unique;
     if (const auto pk_attr = find_attribute_by_name(name); pk_attr != std::end(object_->attributes_)) {
         pk_constraint.attr_ = &*pk_attr;
     }
-    pk_constraint.owner_ = object_.get();
+    pk_constraint.owner_ = object_;
 }
 
 std::list<attribute>::iterator object_generator::find_attribute_by_name(const std::string& name) const {
@@ -63,4 +59,13 @@ void object_generator::prepare_primary_key(attribute& ref, utils::identifier &&p
     object_->pk_attribute_ = &ref;
     object_->pk_identifier_ = std::move(pk);
 }
+
+std::shared_ptr<class object> object_generator::fk_object(const std::type_index& ti) const {
+  const auto result = repo_.basic_info(ti);
+  if (result) {
+    return result->get().object();
+  }
+
+  return repo_.provide_object_in_advance(ti, std::make_shared<object>(""));
+}
 }

source/core/object/repository.cpp

@@ -213,4 +213,20 @@ void repository::expect_relation_node(const std::string &name, const std::type_i
 void repository::remove_expected_relation_node( const std::string& name ) {
   expected_relation_nodes_.erase(name);
 }
+
+std::shared_ptr<object> repository::provide_object_in_advance(const std::type_index &ti, const std::shared_ptr<object>& obj) {
+  return object_by_type_.insert({ti, obj}).first->second;
+}
+
+bool repository::has_object_for_type(const std::type_index &ti) const {
+  return object_by_type_.count(ti) > 0;
+}
+
+std::shared_ptr<object> repository::object_for_type(const std::type_index &ti) const {
+  return object_by_type_.at(ti);
+}
+
+void repository::remove_object_for_type(const std::type_index &ti) {
+  object_by_type_.erase(ti);
+}
 } // namespace matador::object

source/core/object/restriction.cpp

@@ -1,15 +1,16 @@
-#include "matador/object/constraint.hpp"
+#include "matador/object/restriction.hpp"
+
 #include "matador/object/attribute.hpp"
 
 namespace matador::object {
-constraint::constraint(std::string name)
+restriction::restriction(std::string name)
 : name_(std::move(name)) {}
 
-const std::string & constraint::name() const {
+const std::string & restriction::name() const {
   return name_;
 }
 
-const class attribute* constraint::attribute() const {
+const class attribute* restriction::attribute() const {
   if (std::holds_alternative<class attribute*>(attr_)) {
     return std::get<class attribute*>(attr_);
   }
@@ -17,7 +18,7 @@ const class attribute* constraint::attribute() const {
   return nullptr;
 }
 
-std::string constraint::column_name() const {
+std::string restriction::column_name() const {
     if (std::holds_alternative<class attribute*>(attr_)) {
         return std::get<class attribute*>(attr_)->name();
     }
@@ -28,31 +29,31 @@ std::string constraint::column_name() const {
     return "";
 }
 
-const object* constraint::owner() const {
+std::shared_ptr<object> restriction::owner() const {
   return owner_;
 }
 
-bool constraint::is_primary_key_constraint() const {
+bool restriction::is_primary_key_constraint() const {
   return utils::is_constraint_set(options_, utils::constraints::PrimaryKey);
 }
 
-bool constraint::is_foreign_key_constraint() const {
+bool restriction::is_foreign_key_constraint() const {
   return utils::is_constraint_set(options_, utils::constraints::ForeignKey);
 }
 
-bool constraint::is_unique_constraint() const {
+bool restriction::is_unique_constraint() const {
   return utils::is_constraint_set(options_, utils::constraints::Unique);
 }
 
-const std::string& constraint::ref_table_name() const {
+const std::string& restriction::ref_table_name() const {
   return ref_table_name_;
 }
 
-const std::string& constraint::ref_column_name() const {
+const std::string& restriction::ref_column_name() const {
   return ref_column_name_;
 }
 
-std::ostream & operator<<(std::ostream &os, const class constraint &c) {
+std::ostream & operator<<(std::ostream &os, const class restriction &c) {
   os << "constraint " << c.name_ << " for column " << c.column_name();
   return os;
 }
@@ -81,8 +82,8 @@ constraint_builder & constraint_builder::references(std::string table, std::stri
   return *this;
 }
 
-constraint_builder::operator class constraint() const {
-  class constraint c;
+constraint_builder::operator class restriction() const {
+  class restriction c;
   c.name_ = constraint_name;
   c.attr_ = column_name;
   c.options_ = options_;

source/orm/orm/schema.cpp

@@ -181,7 +181,7 @@ utils::result<bool, utils::error> schema::table_exists(const std::string& table_
     return c->exists(repo_.name(), table_name);
 }
 
-sql::query_context schema::build_add_constraint_context( const object::repository_node& node, const class object::constraint& cons ) const {
+sql::query_context schema::build_add_constraint_context( const object::repository_node& node, const class object::restriction& cons ) const {
   if (cons.is_foreign_key_constraint()) {
     return query::query::alter()
       .table(node.name())
@@ -200,7 +200,7 @@ sql::query_context schema::build_add_constraint_context( const object::repositor
   return {};
 }
 
-sql::query_context schema::build_drop_constraint_context( const object::repository_node& node, const class object::constraint& cons ) const {
+sql::query_context schema::build_drop_constraint_context( const object::repository_node& node, const class object::restriction& cons ) const {
     return query::query::alter()
       .table(node.name())
       .drop_constraint(cons.name())

source/orm/orm/session.cpp

@@ -76,7 +76,7 @@ utils::result<void, utils::error> session::create_schema() const {
   return utils::ok<void>();
 }
 
-sql::query_context session::build_add_constraint_context(const std::string& table_name, const class object::constraint& cons, const sql::connection_ptr &conn) {
+sql::query_context session::build_add_constraint_context(const std::string& table_name, const class object::restriction& cons, const sql::connection_ptr &conn) {
   if (cons.is_foreign_key_constraint()) {
     return query::query::alter()
       .table(table_name)

source/orm/query/builder.cpp

@@ -48,8 +48,8 @@ constraint_builder& constraint_builder::references( std::string table, std::stri
   return *this;
 }
 
-constraint_builder::operator object::constraint() const {
-  return object::constraint{constraint_name};
+constraint_builder::operator object::restriction() const {
+  return object::restriction{constraint_name};
 }
 
 constraint_builder constraint( std::string name ) {

source/orm/query/column.cpp

@@ -48,7 +48,7 @@ bool column::equals(const column &x) const {
          function_ == x.function_;
 }
 
-column &column::as(std::string a) {
+column column::as(std::string a) {
   alias_ = std::move(a);
   return *this;
 }

source/orm/query/intermediates/query_create_intermediate.cpp

@@ -18,11 +18,11 @@ executable_query query_create_intermediate::schema( const std::string& schema_na
   return {context_};
 }
 
-executable_query query_create_table_columns_intermediate::constraints( std::initializer_list<class object::constraint> constraints ) {
+executable_query query_create_table_columns_intermediate::constraints(const std::initializer_list<class object::restriction> constraints) {
   return this->constraints(std::list(constraints));
 }
 
-executable_query query_create_table_columns_intermediate::constraints( const std::list<class object::constraint>& constraints ) {
+executable_query query_create_table_columns_intermediate::constraints(const std::list<class object::restriction>& constraints) {
 
   context_->parts.push_back(std::make_unique<internal::query_create_table_constraints_part>(constraints));
   return {context_};
@@ -37,4 +37,12 @@ query_create_table_columns_intermediate query_create_table_intermediate::columns
   context_->parts.push_back(std::make_unique<internal::query_create_table_columns_part>(columns));
   return {context_};
 }
+
+query_create_table_columns_intermediate query_create_table_intermediate::columns(std::initializer_list<column> columns) {
+  return {context_};
+}
+
+query_create_table_columns_intermediate query_create_table_intermediate::columns(const std::list<column>& columns) {
+  return {context_};
+}
 }

source/orm/query/internal/query_parts.cpp

@@ -370,11 +370,11 @@ void query_create_table_columns_part::accept(query_part_visitor& visitor) {
   visitor.visit(*this);
 }
 
-query_create_table_constraints_part::query_create_table_constraints_part(const std::list<class object::constraint>& constraints)
+query_create_table_constraints_part::query_create_table_constraints_part(const std::list<class object::restriction>& constraints)
 : query_part( sql::dialect_token::Constraint )
 , constraints_(constraints) {}
 
-const std::list<class object::constraint>& query_create_table_constraints_part::constraints() const {
+const std::list<class object::restriction>& query_create_table_constraints_part::constraints() const {
   return constraints_;
 }
 

source/orm/query/query_compiler.cpp

@@ -294,7 +294,7 @@ void query_compiler::visit(internal::query_create_part &/*create_part*/)
 }
 
 std::string build_create_column(const object::attribute &col, const sql::dialect &d);
-std::string build_constraint(const class object::constraint &cons, const sql::dialect &d);
+std::string build_constraint(const class object::restriction &cons, const sql::dialect &d);
 
 void query_compiler::visit(internal::query_create_table_part &part)
 {
@@ -392,7 +392,7 @@ std::string build_create_column(const object::attribute &col, const sql::dialect
   return result;
 }
 
-std::string build_constraint(const class object::constraint& cons, const sql::dialect& d) {
+std::string build_constraint(const class object::restriction& cons, const sql::dialect& d) {
     std::string result;
     if (!cons.name().empty()) {
         result.append(d.constraint()).append(" ").append(cons.name()).append(" ");

source/orm/query/table.cpp

@@ -24,7 +24,7 @@ bool table::operator==( const table& x ) const {
   return name_ == x.name_;
 }
 
-table & table::as(const std::string &a) {
+table table::as(const std::string &a) {
   alias_ = a;
   return *this;
 }
@@ -49,10 +49,6 @@ const std::vector<column>& table::columns() const {
   return columns_;
 }
 
-// column table::column(const std::string& name) const {
-//   return {std::shared_ptr<table>(const_cast<table*>(this)), name};
-// }
-
 table::operator const std::vector<query::column>&() const {
   return columns_;
 }