collection_resolver progress

include/matador/object/abstract_collection_resolver.hpp

@@ -0,0 +1,25 @@
+#ifndef MATADOR_ABSTRACT_COLLECTION_RESOLVER_HPP
+#define MATADOR_ABSTRACT_COLLECTION_RESOLVER_HPP
+
+#include <string>
+#include <typeindex>
+
+namespace matador::object {
+class abstract_collection_resolver {
+public:
+  virtual ~abstract_collection_resolver() = default;
+
+  [[nodiscard]] const std::type_index& root_type() const;
+  [[nodiscard]] const std::type_index& type() const;
+  [[nodiscard]] const std::string& collection_name() const;
+
+ protected:
+  explicit abstract_collection_resolver(const std::type_index& root_type, const std::type_index& type, std::string collection_name);
+
+public:
+  const std::type_index root_type_;
+  const std::type_index type_;
+  const std::string collection_name_;
+};
+}
+#endif  // MATADOR_ABSTRACT_COLLECTION_RESOLVER_HPP

include/matador/object/collection_resolver.hpp

@@ -1,30 +1,21 @@
 #ifndef MATADOR_COLLECTION_RESOLVER_HPP
 #define MATADOR_COLLECTION_RESOLVER_HPP
 
-#include "matador/object/abstract_type_resolver.hpp"
-#include "matador/object/object_ptr.hpp"
+#include "matador/object/abstract_collection_resolver.hpp"
 
 #include <typeindex>
 #include <vector>
 
+namespace matador::utils {
+class identifier;
+}
+
 namespace matador::object {
-class abstract_collection_resolver {
-public:
-  virtual ~abstract_collection_resolver() = default;
-
-  [[nodiscard]] const std::type_index& type() const { return type_; }
-
-protected:
-  explicit abstract_collection_resolver(const std::type_index& ti) : type_(ti) {}
-
-public:
-  const std::type_index type_;
-};
-
 template<typename Type>
-class collection_resolver : public abstract_type_resolver {
+class collection_resolver : public abstract_collection_resolver {
 public:
-  collection_resolver() : abstract_type_resolver(typeid(std::vector<Type>)) {}
+  collection_resolver(const std::type_index& root_type, std::string collection_name)
+  : abstract_collection_resolver(root_type, typeid(Type), std::move(collection_name)) {}
 
   virtual std::vector<Type> resolve(const utils::identifier& id) = 0;
 };

include/matador/object/collection_resolver_factory.hpp

@@ -1,7 +1,6 @@
 #ifndef MATADOR_CONTAINER_RESOLVER_FACTORY_HPP
 #define MATADOR_CONTAINER_RESOLVER_FACTORY_HPP
 
-#include "matador/object/abstract_type_resolver_factory.hpp"
 #include "matador/object/collection_resolver.hpp"
 
 namespace matador::object {
@@ -13,11 +12,11 @@ public:
   virtual void register_collection_resolver(std::shared_ptr<abstract_collection_resolver> &&resolver) = 0;
 };
 
-class collection_resolver_factory : public abstract_type_resolver_factory {
+class collection_resolver_factory : public abstract_collection_resolver_factory {
 public:
   template<class Type>
-  std::shared_ptr<collection_resolver<Type>> resolver() {
-    const auto res = acquire_object_resolver(typeid(std::vector<object_ptr<Type>>));
+  std::shared_ptr<collection_resolver<Type>> resolver(const std::type_index &root_type, const std::string &collection_name) {
+    const auto res = acquire_collection_resolver(typeid(Type), root_type, collection_name);
     if (!res) {
       return std::dynamic_pointer_cast<collection_resolver<Type>>(res);
     }

include/matador/object/container_resolver.hpp

@@ -1,23 +0,0 @@
-#ifndef MATADOR_CONTAINER_RESOLVER_HPP
-#define MATADOR_CONTAINER_RESOLVER_HPP
-
-#include "matador/object/abstract_type_resolver.hpp"
-
-#include <memory>
-#include <vector>
-
-namespace matador::utils {
-class identifier;
-}
-
-namespace matador::object {
-template<typename Type>
-class container_resolver : public abstract_type_resolver {
-public:
-  container_resolver() : abstract_type_resolver(typeid(Type)) {}
-
-  virtual std::shared_ptr<std::vector<Type>> resolve(const utils::identifier& id) = 0;
-};
-}
-
-#endif //MATADOR_CONTAINER_RESOLVER_HPP

include/matador/object/object_resolver_factory.hpp

@@ -18,10 +18,5 @@ public:
     return std::dynamic_pointer_cast<object_resolver<Type>>(res);
   }
 };
-
-class object_resolver_service : public object_resolver_factory, public collection_resolver_factory {
-public:
-};
-
 }
 #endif //MATADOR_OBJECT_RESOLVER_FACTORY_HPP

include/matador/query/basic_schema.hpp

@@ -3,6 +3,7 @@
 
 #include "matador/object/repository.hpp"
 
+#include "matador/sql/internal/collection_resolver_producer.hpp"
 #include "matador/sql/producer_resolver_factory.hpp"
 
 #include "matador/query/table.hpp"
@@ -55,10 +56,12 @@ public:
 protected:
   template<typename Type>
   friend class schema_observer;
+  friend class producer_creator;
 
   object::repository repo_;
   std::unordered_map<std::type_index, schema_node> schema_nodes_;
   std::unordered_map<std::type_index, std::unique_ptr<sql::object_resolver_producer>> resolver_producers_;
+  std::unordered_map<sql::composite_key, std::unique_ptr<sql::collection_resolver_producer>, sql::composite_key_hash> collection_resolver_producers_;
 };
 }
 #endif //MATADOR_BASIC_SCHEMA_HPP

include/matador/query/query_collection_resolver.hpp

@@ -0,0 +1,63 @@
+#ifndef MATADOR_QUERY_CONTAINER_RESOLVER_HPP
+#define MATADOR_QUERY_CONTAINER_RESOLVER_HPP
+
+#include "matador/object/collection_resolver.hpp"
+
+#include "matador/sql/internal/identifier_statement_binder.hpp"
+#include "matador/sql/statement.hpp"
+
+#include "matador/query/table.hpp"
+#include "matador/query/select_query_builder.hpp"
+
+namespace matador::sql {
+class executor;
+}
+
+namespace matador::query {
+template<typename Type>
+class query_collection_resolver : public object::collection_resolver<Type> {
+public:
+  explicit query_collection_resolver(const basic_schema &repo, sql::executor& exec, const table &tab, std::string pk_name, const std::type_index& root_type, std::string join_column)
+  : object::collection_resolver<Type>(root_type, join_column)
+  , executor_(exec)
+  , schema_(repo)
+  , table_(tab)
+  , pk_name_(std::move(pk_name))
+  , join_column_(std::move(join_column))
+  {}
+
+  std::vector<Type> resolve(const utils::identifier &id) override;
+protected:
+  sql::executor& executor_;
+  const basic_schema &schema_;
+  const table &table_;
+  std::string pk_name_;
+  std::string join_column_;
+  std::type_index index{typeid(Type)};
+};
+
+template<typename Type>
+std::vector<Type> query_collection_resolver<Type>::resolve(const utils::identifier &id) {
+  const auto *pk_column = table_[pk_name_];
+  const auto *join_column = table_[join_column_];
+
+  auto stmt = query::select({*pk_column})
+    .from(table_)
+    .where(*join_column == id)
+    .prepare(executor_);
+
+  if (!stmt) {
+    return {};
+  }
+
+  sql::identifier_statement_binder binder(*stmt);
+  binder.bind(id);
+
+  auto result = stmt->template fetch_one_raw<Type>();
+  if (!result) {
+    return {};
+  }
+  return {};
+}
+}
+#endif //MATADOR_QUERY_CONTAINER_RESOLVER_HPP

include/matador/query/query_container_resolver.hpp

@@ -1,42 +0,0 @@
-#ifndef MATADOR_QUERY_CONTAINER_RESOLVER_HPP
-#define MATADOR_QUERY_CONTAINER_RESOLVER_HPP
-
-#include "matador/object/container_resolver.hpp"
-
-#include "matador/sql/internal/identifier_statement_binder.hpp"
-#include "matador/sql/statement.hpp"
-
-#include "matador/query/table.hpp"
-#include "matador/query/select_query_builder.hpp"
-
-namespace matador::sql {
-class executor;
-}
-
-namespace matador::query {
-template<typename Type>
-class query_container_resolver : public object::container_resolver<Type> {
-public:
-  explicit query_container_resolver(const basic_schema &repo, sql::executor& exec, const table &tab, std::string pk_name)
-  : executor_(exec)
-  , schema_(repo)
-  , table_(tab)
-  , pk_name_(std::move(pk_name)) {}
-
-  std::shared_ptr<Type> resolve(const utils::identifier &id) override;
-protected:
-  sql::executor& executor_;
-  const basic_schema &schema_;
-  const table &table_;
-  std::string pk_name_;
-  std::type_index index{typeid(Type)};
-};
-
-utils::result<sql::statement, utils::error> prepare_collection_statement(sql::executor& exec, entity_query_data &&data);
-
-template<typename Type>
-std::shared_ptr<Type> query_container_resolver<Type>::resolve(const utils::identifier &id) {
-
-}
-}
-#endif //MATADOR_QUERY_CONTAINER_RESOLVER_HPP

include/matador/query/schema.hpp

@@ -5,7 +5,9 @@
 
 #include "matador/sql/query_context.hpp"
 #include "matador/sql/internal/object_resolver_producer.hpp"
+#include "matador/sql/internal/collection_resolver_producer.hpp"
 
+#include "matador/query/query_collection_resolver.hpp"
 #include "matador/query/query_object_resolver.hpp"
 #include "matador/query/basic_schema.hpp"
 
@@ -38,17 +40,18 @@ private:
 };
 
 template<typename Type>
-class query_collection_resolver_producer : public sql::object_resolver_producer {
+class query_collection_resolver_producer : public sql::collection_resolver_producer {
 public:
   query_collection_resolver_producer() = default;
-  query_collection_resolver_producer(const basic_schema& repo, const table& tab, std::string pk_name)
-  : object_resolver_producer(typeid(Type))
+  query_collection_resolver_producer(const basic_schema& repo, const table& tab, std::string pk_name, const std::type_index& root_type, std::string join_column)
+  : collection_resolver_producer(root_type, typeid(Type), std::move(join_column))
   , repo_(repo)
   , table_(tab)
-  , pk_name_(std::move(pk_name)) {}
+  , pk_name_(std::move(pk_name))
+  {}
 
-  std::shared_ptr<object::abstract_type_resolver> produce(sql::executor &exec) override {
-    return std::make_shared<query_object_resolver<Type>>(repo_, exec, table_, std::move(pk_name_));
+  std::shared_ptr<object::abstract_collection_resolver> produce(sql::executor &exec) override {
+    return std::make_shared<query_collection_resolver<Type>>(repo_, exec, table_, std::move(pk_name_), root_type(), collection_name());
   }
 
 private:
@@ -167,6 +170,11 @@ utils::result<void, utils::error> schema::drop_table(const sql::connection &conn
 
 class producer_creator final {
 public:
+  producer_creator(basic_schema& schema, const std::type_index& root_type)
+  : schema_(schema)
+  , root_type_(root_type)
+  {}
+
   template<typename ValueType>
   void on_primary_key(const char *id, ValueType &value, const utils::primary_key_attribute& attr = utils::default_pk_attributes) {
 
@@ -184,8 +192,24 @@ public:
   void on_has_many_to_many(const char *, ContainerType &, const utils::foreign_attributes &attr) {}
 
   template<class CollectionType>
-  void on_has_many(const char * /*id*/, CollectionType &cont, const char * /*join_column*/, const utils::foreign_attributes &attr, std::enable_if_t<object::is_object_ptr<typename CollectionType::value_type>::value> * = nullptr) {
+  void on_has_many(const char * /*id*/, CollectionType &cont, const char *join_column, const utils::foreign_attributes &attr, std::enable_if_t<object::is_object_ptr<typename CollectionType::value_type>::value> * = nullptr) {
+    // SELECT id FROM books where author_id = ?;
+    const auto it = schema_.find(typeid(typename CollectionType::value_type::value_type));
+    if (it == schema_.end()) {
+      throw query_builder_exception{query_build_error::UnknownType};
+    }
+    if (!it->second.node().info().has_primary_key()) {
+      throw query_builder_exception{query_build_error::MissingPrimaryKey};
+    }
 
+    auto producer = std::make_unique<query_collection_resolver_producer<typename CollectionType::value_type::value_type>>(
+      schema_,
+      it->second.table(),
+      it->second.node().info().primary_key_attribute()->name(),
+      root_type_,
+      join_column);
+    const sql::composite_key key{root_type_, typeid(typename CollectionType::value_type::value_type), join_column};
+    schema_.collection_resolver_producers_[key] = std::move(producer);
   }
 
   template<class CollectionType>
@@ -193,16 +217,26 @@ public:
 
   }
 
+private:
+  basic_schema& schema_;
+  const std::type_index root_type_;
 };
 
 template <typename Type>
 void schema_observer<Type>::on_attach(const object::repository_node &node, const Type &/*prototype*/) const {
   const auto it = schema_.insert_table(typeid(Type), node);
 
-  if (it->second.node().info().has_primary_key()) {
-    auto producer = std::make_unique<query_object_resolver_producer<Type>>(schema_, it->second.table(), it->second.node().info().primary_key_attribute()->name());
-    schema_.resolver_producers_[typeid(Type)] = std::move(producer);
+  if (!it->second.node().info().has_primary_key()) {
+    return;
   }
+
+  auto producer = std::make_unique<query_object_resolver_producer<Type>>(schema_, it->second.table(), it->second.node().info().primary_key_attribute()->name());
+  schema_.resolver_producers_[typeid(Type)] = std::move(producer);
+
+  producer_creator pc(schema_, typeid(Type));
+  Type obj;
+  access::process(pc, obj);
+
 }
 
 template <typename Type>

include/matador/sql/internal/collection_resolver_producer.hpp

@@ -0,0 +1,28 @@
+#ifndef MATADOR_COLLECTION_RESOLVER_PRODUCER_HPP
+#define MATADOR_COLLECTION_RESOLVER_PRODUCER_HPP
+
+#include "matador/object/abstract_collection_resolver.hpp"
+
+#include <memory>
+
+namespace matador::sql {
+class executor;
+class collection_resolver_producer {
+public:
+  virtual ~collection_resolver_producer() = default;
+  virtual std::shared_ptr<object::abstract_collection_resolver> produce(executor &exec) = 0;
+
+  [[nodiscard]] const std::type_index& root_type() const;
+  [[nodiscard]] const std::type_index& type() const;
+  [[nodiscard]] const std::string& collection_name() const;
+
+protected:
+  explicit collection_resolver_producer(const std::type_index &root_type, const std::type_index &type, std::string collection_name);
+
+private:
+  std::type_index root_type_;
+  std::type_index type_;
+  std::string collection_name_;
+};
+}
+#endif  // MATADOR_COLLECTION_RESOLVER_PRODUCER_HPP

include/matador/sql/internal/object_resolver_producer.hpp

@@ -1,7 +1,7 @@
 #ifndef MATADOR_RESOLVER_PRODUCER_HPP
 #define MATADOR_RESOLVER_PRODUCER_HPP
 
-#include "matador/object/object_resolver.hpp"
+#include "matador/object/abstract_type_resolver.hpp"
 
 #include <memory>
 

include/matador/sql/producer_resolver_factory.hpp

@@ -1,23 +1,60 @@
 #ifndef MATADOR_RESOLVER_FACTORY_HPP
 #define MATADOR_RESOLVER_FACTORY_HPP
 
-#include "matador/object/object_resolver_factory.hpp"
-
-#include "matador/sql/internal/object_resolver_producer.hpp"
-
 #include <unordered_map>
 
+#include "matador/object/abstract_collection_resolver.hpp"
+#include "matador/object/object_resolver_factory.hpp"
+#include "matador/sql/internal/object_resolver_producer.hpp"
+
 namespace matador::sql {
 class executor;
 
 class producer_resolver_factory : public object::object_resolver_factory {
 public:
-
   std::shared_ptr<object::abstract_type_resolver> acquire_object_resolver(const std::type_index &type) override;
   void register_object_resolver(std::shared_ptr<object::abstract_type_resolver> &&resolver) override;
 
 private:
   std::unordered_map<std::type_index, std::shared_ptr<object::abstract_type_resolver>> resolvers_;
 };
+
+struct composite_key {
+  std::type_index root_type;
+  std::type_index type;
+  std::string name;
+
+  bool operator==(const composite_key& other) const {
+    return root_type == other.root_type &&
+           type == other.type &&
+           name == other.name;
+  }
+};
+
+struct composite_key_hash {
+  std::size_t operator()(const composite_key& k) const noexcept {
+    const std::size_t h1 = std::hash<std::type_index>{}(k.root_type);
+    const std::size_t h2 = std::hash<std::type_index>{}(k.type);
+    const std::size_t h3 = std::hash<std::string>{}(k.name);
+
+    // Klassische Hash-Kombination (Boost-Style)
+    std::size_t seed = h1;
+    seed ^= h2 + 0x9e3779b9 + (seed << 6) + (seed >> 2);
+    seed ^= h3 + 0x9e3779b9 + (seed << 6) + (seed >> 2);
+
+    return seed;
+  }
+};
+
+class producer_collection_resolver_factory : public object::collection_resolver_factory {
+public:
+  std::shared_ptr<object::abstract_collection_resolver> acquire_collection_resolver(const std::type_index& root_type,
+                                                                                    const std::type_index& element_type,
+                                                                                    const std::string& collection_name) override;
+  void register_collection_resolver(std::shared_ptr<object::abstract_collection_resolver>&& resolver) override;
+
+private:
+  std::unordered_map<composite_key, std::shared_ptr<object::abstract_collection_resolver>, composite_key_hash> resolvers_;
+};
 }
 #endif //MATADOR_RESOLVER_FACTORY_HPP

source/core/CMakeLists.txt

@@ -13,9 +13,15 @@ add_library(matador-core STATIC
   ../../include/matador/net/reactor.hpp
   ../../include/matador/net/select_fd_sets.hpp
   ../../include/matador/net/socket_interrupter.hpp
+  ../../include/matador/object/abstract_collection_resolver.hpp
+  ../../include/matador/object/abstract_type_resolver.hpp
+  ../../include/matador/object/abstract_type_resolver_factory.hpp
   ../../include/matador/object/attribute.hpp
   ../../include/matador/object/basic_object_info.hpp
   ../../include/matador/object/basic_repository.hpp
+  ../../include/matador/object/collection_proxy.hpp
+  ../../include/matador/object/collection_resolver.hpp
+  ../../include/matador/object/collection_resolver_factory.hpp
   ../../include/matador/object/error_code.hpp
   ../../include/matador/object/foreign_node_completer.hpp
   ../../include/matador/object/internal/observer_list_copy_creator.hpp
@@ -81,6 +87,7 @@ add_library(matador-core STATIC
   logger/log_manager.cpp
   logger/logger.cpp
   logger/rotating_file_sink.cpp
+  object/abstract_collection_resolver.cpp
   object/attribute.cpp
   object/basic_object_info.cpp
   object/basic_repository.cpp
@@ -113,12 +120,6 @@ add_library(matador-core STATIC
   utils/uuid.cpp
   utils/value.cpp
   utils/version.cpp
-  ../../include/matador/object/collection_proxy.hpp
-  ../../include/matador/object/collection_resolver_factory.hpp
-  ../../include/matador/object/collection_resolver.hpp
-  ../../include/matador/object/abstract_type_resolver.hpp
-  ../../include/matador/object/abstract_type_resolver_factory.hpp
-  ../../include/matador/object/container_resolver.hpp
 )
 
 target_link_libraries(matador-core ${CMAKE_DL_LIBS})

source/core/object/abstract_collection_resolver.cpp

@@ -0,0 +1,23 @@
+#include "matador/object/abstract_collection_resolver.hpp"
+
+namespace matador::object {
+
+const std::type_index& abstract_collection_resolver::root_type() const {
+  return root_type_;
+}
+
+const std::type_index& abstract_collection_resolver::type() const {
+  return type_;
+}
+
+const std::string& abstract_collection_resolver::collection_name() const {
+  return collection_name_;
+}
+
+abstract_collection_resolver::abstract_collection_resolver(const std::type_index& root_type, const std::type_index& type, std::string collection_name)
+: root_type_(root_type)
+, type_(type)
+, collection_name_(std::move(collection_name)) {}
+
+
+}  // namespace matador::object

source/orm/CMakeLists.txt

@@ -54,14 +54,15 @@ add_library(matador-orm STATIC
   ../../include/matador/query/meta_table_macro.hpp
   ../../include/matador/query/meta_table_macro.hpp
   ../../include/matador/query/query.hpp
-  ../../include/matador/query/select_query_builder.hpp
   ../../include/matador/query/query_builder.hpp
+  ../../include/matador/query/query_collection_resolver.hpp
   ../../include/matador/query/query_data.hpp
   ../../include/matador/query/query_intermediates.hpp
   ../../include/matador/query/query_object_resolver.hpp
   ../../include/matador/query/query_part.hpp
   ../../include/matador/query/query_utils.hpp
   ../../include/matador/query/schema.hpp
+  ../../include/matador/query/select_query_builder.hpp
   ../../include/matador/query/table.hpp
   ../../include/matador/query/table_column.hpp
   ../../include/matador/query/table_constraint.hpp
@@ -81,12 +82,13 @@ add_library(matador-orm STATIC
   ../../include/matador/sql/interface/query_result_reader.hpp
   ../../include/matador/sql/interface/statement_impl.hpp
   ../../include/matador/sql/interface/statement_proxy.hpp
+  ../../include/matador/sql/internal/collection_resolver_producer.hpp
   ../../include/matador/sql/internal/identifier_reader.hpp
   ../../include/matador/sql/internal/identifier_statement_binder.hpp
+  ../../include/matador/sql/internal/object_resolver_producer.hpp
   ../../include/matador/sql/internal/object_result_binder.hpp
   ../../include/matador/sql/internal/query_result_impl.hpp
   ../../include/matador/sql/internal/query_result_pk_resolver.hpp
-  ../../include/matador/sql/internal/object_resolver_producer.hpp
   ../../include/matador/sql/internal/statement_object_resolver.hpp
   ../../include/matador/sql/producer_resolver_factory.hpp
   ../../include/matador/sql/query_context.hpp
@@ -146,13 +148,14 @@ add_library(matador-orm STATIC
   query/internal/string_builder_utils.cpp
   query/key_value_generator.cpp
   query/query.cpp
-  query/select_query_builder.cpp
-  query/query_builder_exception.cpp
   query/query_builder.cpp
+  query/query_builder_exception.cpp
+  query/query_collection_resolver.cpp
   query/query_object_resolver.cpp
   query/query_part.cpp
   query/query_utils.cpp
   query/schema.cpp
+  query/select_query_builder.cpp
   query/table.cpp
   query/table_column.cpp
   query/table_constraint.cpp
@@ -169,19 +172,18 @@ add_library(matador-orm STATIC
   sql/interface/query_result_reader.cpp
   sql/interface/statement_impl.cpp
   sql/interface/statement_proxy.cpp
+  sql/internal/collection_resolver_producer.cpp
   sql/internal/identifier_reader.cpp
   sql/internal/identifier_statement_binder.cpp
+  sql/internal/object_resolver_producer.cpp
   sql/internal/object_result_binder.cpp
   sql/internal/query_result_pk_resolver.cpp
-  sql/internal/object_resolver_producer.cpp
   sql/object_parameter_binder.cpp
   sql/producer_resolver_factory.cpp
   sql/query_result.cpp
   sql/record.cpp
   sql/statement.cpp
   sql/statement_cache.cpp
-  ../../include/matador/query/query_container_resolver.hpp
-  query/query_container_resolver.cpp
 )
 
 target_include_directories(matador-orm

source/orm/query/basic_schema.cpp

@@ -87,6 +87,12 @@ void basic_schema::initialize_executor(sql::executor &exec) const {
     auto resolver = producer->produce(exec);
     exec.resolver_factory()->register_object_resolver(std::move(resolver));
   }
+
+  auto collection_factory = std::make_shared<sql::producer_collection_resolver_factory>();
+  for (const auto &[key, producer] : collection_resolver_producers_) {
+    auto resolver = producer->produce(exec);
+    // exec.resolver_factory()->register_collection_resolver(std::move(resolver));
+  }
 }
 
 }

source/orm/query/query_collection_resolver.cpp

@@ -0,0 +1 @@
+#include "matador/query/query_collection_resolver.hpp"

source/orm/query/query_container_resolver.cpp

@@ -1,14 +0,0 @@
-#include "matador/query/query_container_resolver.hpp"
-
-namespace matador::query {
-utils::result<sql::statement, utils::error> prepare_collection_statement(sql::executor& exec, entity_query_data &&data) {
-  return query::query::select(data.columns)
-      .from(*data.root_table)
-      .join_left(data.joins)
-      .where(std::move(data.where_clause))
-      .order_by({data.root_table, data.pk_column_name})
-      .asc()
-      .prepare(exec);
-}
-
-}

source/orm/sql/internal/collection_resolver_producer.cpp

@@ -0,0 +1,17 @@
+#include "matador/sql/internal/collection_resolver_producer.hpp"
+
+namespace matador::sql {
+const std::type_index& collection_resolver_producer::root_type() const {
+  return root_type_;
+}
+const std::type_index& collection_resolver_producer::type() const {
+  return type_;
+}
+const std::string& collection_resolver_producer::collection_name() const {
+  return collection_name_;
+}
+collection_resolver_producer::collection_resolver_producer(const std::type_index& root_type,
+                                                           const std::type_index& type,
+                                                           std::string collection_name)
+: root_type_(root_type), type_(type), collection_name_(std::move(collection_name)) {}
+}  // namespace matador::sql

source/orm/sql/producer_resolver_factory.cpp

@@ -11,4 +11,18 @@ std::shared_ptr<object::abstract_type_resolver> producer_resolver_factory::acqui
 void producer_resolver_factory::register_object_resolver(std::shared_ptr<object::abstract_type_resolver> &&resolver) {
   resolvers_[resolver->type()] = std::move(resolver);
 }
+std::shared_ptr<object::abstract_collection_resolver>
+producer_collection_resolver_factory::acquire_collection_resolver(const std::type_index& root_type,
+                                                                  const std::type_index& element_type,
+                                                                  const std::string& collection_name) {
+  const composite_key key{root_type, element_type, collection_name};
+  if (const auto it = resolvers_.find(key); it != resolvers_.end()) {
+    return it->second;
+  }
+  return nullptr;
 }
+void producer_collection_resolver_factory::register_collection_resolver(std::shared_ptr<object::abstract_collection_resolver>&& resolver) {
+  const composite_key key{resolver->root_type(), resolver->type(), resolver->collection_name()};
+  resolvers_[key] = std::move(resolver);
+}
+}  // namespace matador::sql