entity query and record progress

backends/mysql/include/mysql_connection.hpp

@@ -37,7 +37,7 @@ public:
 
   size_t execute(const std::string &stmt) override;
 
-  sql::record describe(const std::string& table) override;
+  std::vector<sql::column_definition> describe(const std::string& table) override;
 
   bool exists(const std::string &schema_name, const std::string &table_name) override;
 

backends/mysql/src/mysql_connection.cpp

@@ -181,13 +181,13 @@ std::unique_ptr<sql::query_result_impl> mysql_connection::fetch(const std::strin
 
   auto field_count = mysql_num_fields(result);
   auto fields = mysql_fetch_fields(result);
-  sql::record prototype;
+  std::vector<sql::column_definition> prototype;
   for (unsigned i = 0; i < field_count; ++i) {
     auto type = to_type(fields[i].type, fields[i].flags);
     auto options = to_constraints(fields[i].flags);
     auto null_opt = to_null_option(fields[i].flags);
 
-    prototype.append({fields[i].name, type, options, null_opt});
+    prototype.emplace_back(fields[i].name, type, options, null_opt);
   }
 
   return std::move(std::make_unique<sql::query_result_impl>(std::make_unique<mysql_result_reader>(result, field_count), std::move(prototype)));
@@ -216,7 +216,7 @@ size_t mysql_connection::execute(const std::string &stmt)
   return mysql_affected_rows(mysql_.get());
 }
 
-sql::record mysql_connection::describe(const std::string &table)
+std::vector<sql::column_definition> mysql_connection::describe(const std::string &table)
 {
   std::string stmt("SHOW COLUMNS FROM " + table);
 
@@ -230,7 +230,7 @@ sql::record mysql_connection::describe(const std::string &table)
   }
 
   mysql_result_reader reader(result, mysql_num_fields(result));
-  sql::record prototype;
+  std::vector<sql::column_definition> prototype;
   while (reader.fetch()) {
 
     char *end = nullptr;
@@ -242,7 +242,7 @@ sql::record mysql_connection::describe(const std::string &table)
     if (strtoul(reader.column(2), &end, 10) == 0) {
       null_opt = sql::null_option::NOT_NULL;
     }
-    prototype.append({name, typeinfo.type, {typeinfo.size}, null_opt, prototype.size()});
+    prototype.push_back({name, typeinfo.type, {typeinfo.size}, null_opt, prototype.size()});
   }
 
   return prototype;

backends/postgres/include/postgres_connection.hpp

@@ -33,7 +33,7 @@ public:
 
   size_t execute(const std::string &stmt) override;
 
-  sql::record describe(const std::string& table) override;
+  std::vector<sql::column_definition> describe(const std::string& table) override;
 
   bool exists(const std::string &schema_name, const std::string &table_name) override;
 

backends/postgres/src/postgres_connection.cpp

@@ -51,14 +51,13 @@ std::unique_ptr<sql::query_result_impl> postgres_connection::fetch(const std::st
 
   throw_postgres_error(res, conn_, "postgres", stmt);
 
-  sql::record prototype;
+  std::vector<sql::column_definition> prototype;
   auto num_col = PQnfields(res);
   for (int i = 0; i < num_col; ++i) {
     const char *col_name = PQfname(res, i);
     auto type = PQftype(res, i);
     auto size = PQfmod(res, i);
-//    std::cout << "column " << col_name << ", type " << type << " (size: " << size << ")\n";
-    prototype.append(sql::column_definition{col_name});
+    prototype.emplace_back(col_name);
   }
   return std::move(std::make_unique<sql::query_result_impl>(std::make_unique<postgres_result_reader>(res), std::move(prototype)));
 }
@@ -131,7 +130,7 @@ sql::data_type_t string2type(const char *type)
   }
 }
 
-sql::record postgres_connection::describe(const std::string &table)
+std::vector<sql::column_definition> postgres_connection::describe(const std::string &table)
 {
   std::string stmt(
     "SELECT ordinal_position, column_name, udt_name, data_type, is_nullable, column_default FROM information_schema.columns WHERE table_schema='public' AND table_name='" + table + "'");
@@ -141,7 +140,7 @@ sql::record postgres_connection::describe(const std::string &table)
   throw_postgres_error(res, conn_, "postgres", stmt);
 
   postgres_result_reader reader(res);
-  sql::record prototype;
+  std::vector<sql::column_definition> prototype;
   while (reader.fetch()) {
     char *end = nullptr;
     // Todo: Handle error
@@ -156,7 +155,7 @@ sql::record postgres_connection::describe(const std::string &table)
       null_opt = sql::null_option::NOT_NULL;
     }
     // f.default_value(res->column(4));
-    prototype.append({name, type, utils::null_attributes, null_opt, index});
+    prototype.emplace_back(name, type, utils::null_attributes, null_opt, index);
   }
 
   return std::move(prototype);

backends/sqlite/include/sqlite_connection.hpp

@@ -33,14 +33,14 @@ public:
 
   size_t execute(const std::string &stmt) override;
 
-  sql::record describe(const std::string& table) override;
+  std::vector<sql::column_definition> describe(const std::string& table) override;
 
   bool exists(const std::string &schema_name, const std::string &table_name) override;
 
 private:
   struct fetch_context
   {
-    sql::record prototype;
+    std::vector<sql::column_definition> prototype;
     sqlite_result_reader::rows rows;
   };
 

backends/sqlite/src/sqlite_connection.cpp

@@ -65,7 +65,7 @@ int sqlite_connection::parse_result(void* param, int column_count, char** values
 
   if (context->prototype.empty()) {
     for(int i = 0; i < column_count; ++i) {
-      context->prototype.append(sql::column_definition{columns[i]});
+      context->prototype.emplace_back(columns[i]);
     }
   }
 
@@ -144,12 +144,12 @@ sql::data_type_t string2type(const char *type)
   }
 }
 
-sql::record sqlite_connection::describe(const std::string& table)
+std::vector<sql::column_definition> sqlite_connection::describe(const std::string& table)
 {
   const auto result = fetch_internal("PRAGMA table_info(" + table + ")");
 
   sqlite_result_reader reader(result.rows, result.prototype.size());
-  sql::record prototype;
+  std::vector<sql::column_definition> prototype;
   while (reader.fetch()) {
     char *end = nullptr;
     // Todo: add index to column
@@ -163,7 +163,7 @@ sql::record sqlite_connection::describe(const std::string& table)
       null_opt = sql::null_option::NOT_NULL;
     }
     // f.default_value(res->column(4));
-    prototype.append({name, type, utils::null_attributes, null_opt, index});
+    prototype.emplace_back(name, type, utils::null_attributes, null_opt, index);
   }
 
   return std::move(prototype);

backends/tests/SessionTest.cpp

@@ -37,10 +37,19 @@ private:
 using namespace matador;
 
 TEST_CASE_METHOD(SessionFixture, "Session relation test", "[session][relation]") {
-
-  ses.attach<matador::test::airplane>("airplane");
+  using namespace matador;
+  ses.attach<test::airplane>("airplane");
   ses.create_schema();
   ses.insert<test::airplane>(1, "Boeing", "A380");
 
   REQUIRE(true);
+}
+
+TEST_CASE_METHOD(SessionFixture, "Find object with id", "[session][find]") {
+  ses.attach<matador::test::airplane>("airplane");
+  ses.create_schema();
+  auto a380 = ses.insert<test::airplane>(1, "Boeing", "A380");
+
+  ses.find<test::airplane>(1);
+
 }

include/matador/sql/any_type.hpp

@@ -10,6 +10,17 @@
 
 namespace matador::sql {
 
+using any_db_type = std::variant<
+  long long,
+  unsigned long long,
+  double,
+  bool,
+  const char*,
+  std::string,
+  utils::blob,
+  placeholder,
+  nullptr_t>;
+
 using any_type = std::variant<
   char, short, int, long, long long,
   unsigned char, unsigned short, unsigned int, unsigned long, unsigned long long,

include/matador/sql/connection.hpp

@@ -9,7 +9,6 @@
 #include "matador/sql/query_result.hpp"
 #include "matador/sql/record.hpp"
 #include "matador/sql/statement.hpp"
-#include "matador/sql/schema.hpp"
 
 #include "matador/utils/logger.hpp"
 
@@ -17,6 +16,8 @@
 
 namespace matador::sql {
 
+class schema;
+
 class connection
 {
 public:
@@ -32,7 +33,7 @@ public:
   [[nodiscard]] bool is_open() const;
   [[nodiscard]] const connection_info& info() const;
 
-  [[nodiscard]] record describe(const std::string &table_name) const;
+  [[nodiscard]] std::vector<sql::column_definition> describe(const std::string &table_name) const;
   [[nodiscard]] bool exists(const std::string &schema_name, const std::string &table_name) const;
   [[nodiscard]] bool exists(const std::string &table_name) const;
 

include/matador/sql/connection_impl.hpp

@@ -26,7 +26,7 @@ public:
   virtual std::unique_ptr<query_result_impl> fetch(const std::string &stmt) = 0;
   virtual std::unique_ptr<statement_impl> prepare(query_context context) = 0;
 
-  virtual record describe(const std::string &table) = 0;
+  virtual std::vector<sql::column_definition> describe(const std::string &table) = 0;
   virtual bool exists(const std::string &schema_name, const std::string &table_name) = 0;
 
 protected:

include/matador/sql/entity_query_builder.hpp

@@ -0,0 +1,62 @@
+#ifndef QUERY_ENTITY_QUERY_BUILDER_HPP
+#define QUERY_ENTITY_QUERY_BUILDER_HPP
+
+#include "matador/sql/query_context.hpp"
+
+namespace matador::sql {
+
+template < typename PrimaryKeyType >
+class entity_query_builder
+{
+public:
+  // determine pk
+  // collect eager relations for joins
+  template<class EntityType>
+  query_context build() {
+    EntityType obj;
+    matador::utils::access::process(*this, obj);
+    return {};
+  }
+
+  template < class V >
+  void on_primary_key(const char *id, V &, typename std::enable_if<std::is_integral<V>::value && !std::is_same<bool, V>::value>::type* = 0)
+  {
+  }
+
+  void on_primary_key(const char *id, std::string &, size_t)
+  {
+
+  }
+  void on_revision(const char * /*id*/, unsigned long long &/*rev*/) {}
+
+  template<typename Type>
+  void on_attribute(const char * /*id*/, Type &, const utils::field_attributes &/*attr*/ = utils::null_attributes) {}
+
+  template<class Pointer>
+  void on_belongs_to(const char *id, Pointer &, const utils::foreign_attributes &/*attr*/)
+  {
+  }
+
+  template<class Pointer>
+  void on_has_one(const char *id, Pointer &, const utils::foreign_attributes &attr)
+  {
+
+  }
+
+  template<class ContainerType>
+  void on_has_many(const char *, ContainerType &, const char *, const char *, const utils::foreign_attributes &attr)
+  {
+  }
+
+  template<class ContainerType>
+  void on_has_many(const char *id, ContainerType &c, const utils::foreign_attributes &attr)
+  {
+    on_has_many(id, c, "", "", attr);
+  }
+
+private:
+  PrimaryKeyType pk_;
+};
+
+}
+#endif //QUERY_ENTITY_QUERY_BUILDER_HPP

include/matador/sql/field.hpp

@@ -0,0 +1,37 @@
+#ifndef QUERY_FIELD_HPP
+#define QUERY_FIELD_HPP
+
+#include "matador/sql/any_type.hpp"
+#include "matador/sql/any_type_to_visitor.hpp"
+
+#include <string>
+
+namespace matador::sql {
+
+class field
+{
+public:
+
+  [[nodiscard]] const std::string& name() const;
+
+  template<class Type>
+  Type as() const
+  {
+    const Type* ptr= std::get_if<Type>(&value_);
+    if (ptr) {
+      return *ptr;
+    }
+    any_type_to_visitor<Type> visitor;
+    std::visit(visitor, const_cast<any_type&>(value_));
+    return visitor.result;
+  }
+
+  friend std::ostream& operator<<(std::ostream &out, const field &col);
+
+private:
+  std::string name_;
+  any_type value_;
+};
+
+}
+#endif //QUERY_FIELD_HPP

include/matador/sql/noop_connection.hpp

@@ -16,7 +16,7 @@ public:
   size_t execute(const std::string &stmt) override;
   std::unique_ptr<query_result_impl> fetch(const std::string &stmt) override;
   std::unique_ptr<statement_impl> prepare(query_context context) override;
-  record describe(const std::string &table) override;
+  std::vector<sql::column_definition> describe(const std::string &table) override;
   bool exists(const std::string &schema_name, const std::string &table_name) override;
 
 private:

include/matador/sql/query_context.hpp

@@ -11,7 +11,7 @@ struct query_context
   std::string sql;
   std::string command_name;
   sql::table table{""};
-  record prototype;
+  std::vector<column_definition> prototype;
   std::vector<std::string> result_vars;
   std::vector<std::string> bind_vars;
 };

include/matador/sql/query_result.hpp

@@ -107,13 +107,13 @@ private:
 namespace detail {
 
 template < typename Type >
-Type* create_prototype(const record &/*prototype*/)
+Type* create_prototype(const std::vector<column_definition> &/*prototype*/)
 {
   return new Type{};
 }
 
 template <>
-record* create_prototype<record>(const record &prototype);
+record* create_prototype<record>(const std::vector<column_definition> &prototype);
 
 }
 
@@ -128,7 +128,7 @@ public:
   explicit query_result(std::unique_ptr<query_result_impl> impl)
   : impl_(std::move(impl)) {}
 
-  query_result(std::unique_ptr<query_result_impl> impl, record record_prototype)
+  query_result(std::unique_ptr<query_result_impl> impl, std::vector<column_definition> record_prototype)
   : record_prototype_(std::move(record_prototype))
   , impl_(std::move(impl)) {}
 
@@ -151,7 +151,7 @@ private:
   }
 
 private:
-  record record_prototype_;
+  std::vector<column_definition> record_prototype_;
   std::unique_ptr<query_result_impl> impl_;
 };
 

include/matador/sql/query_result_impl.hpp

@@ -55,7 +55,7 @@ private:
 class query_result_impl
 {
 public:
-  query_result_impl(std::unique_ptr<query_result_reader> &&reader, record prototype);
+  query_result_impl(std::unique_ptr<query_result_reader> &&reader, std::vector<column_definition> prototype);
 
   template<typename ValueType>
   void on_primary_key(const char *id, ValueType &value, typename std::enable_if<std::is_integral<ValueType>::value && !std::is_same<bool, ValueType>::value>::type* = 0)
@@ -110,11 +110,11 @@ public:
     return true;
   }
 
-  [[nodiscard]] const record& prototype() const;
+  [[nodiscard]] const std::vector<column_definition>& prototype() const;
 
 protected:
   size_t column_index_ = 0;
-  record prototype_;
+  std::vector<column_definition> prototype_;
   std::unique_ptr<query_result_reader> reader_;
   detail::pk_reader pk_reader_;
 };

include/matador/sql/session.hpp

@@ -31,6 +31,28 @@ public:
     return insert(new Type(std::forward<Args>(args)...));
   }
 
+  template<typename Type, typename PrimaryKeyType>
+  entity<Type> find(const PrimaryKeyType &pk) {
+    auto c = pool_.acquire();
+    if (!c.valid()) {
+      throw std::logic_error("no database connection available");
+    }
+    // collect all columns
+    // - evaluate fetch::Eager flag for relations
+
+    // build pk where condition
+    // - check if type has pk
+    // - check type
+//    pk_condition_builder<Type> builder;
+//    auto cond = builder.build(pk);
+
+    // create query with relations as requested
+    // 
+//    c->query(*schema_).select<Type>().from("xyz").where().fetch_all();
+
+    return {};
+  }
+
   template<typename Type>
   void drop_table();
   void drop_table(const std::string &table_name);
@@ -40,7 +62,7 @@ public:
   [[nodiscard]] size_t execute(const std::string &sql) const;
   statement prepare(query_context q) const;
 
-  record describe_table(const std::string &table_name) const;
+  std::vector<sql::column_definition> describe_table(const std::string &table_name) const;
   bool table_exists(const std::string &table_name) const;
 
   [[nodiscard]] const schema& tables() const;

src/CMakeLists.txt

@@ -35,6 +35,7 @@ set(SQL_SOURCES
   sql/noop_connection.cpp
   sql/query_part.cpp
   sql/any_type_to_string_visitor.cpp
+  sql/field.cpp
 )
 
 set(SQL_HEADER
@@ -86,6 +87,8 @@ set(SQL_HEADER
   ../include/matador/sql/query_part.hpp
   ../include/matador/sql/any_type_to_string_visitor.hpp
   ../include/matador/sql/query_helper.hpp
+  ../include/matador/sql/field.hpp
+  ../include/matador/sql/entity_query_builder.hpp
 )
 
 set(QUERY_SOURCES

src/sql/connection.cpp

@@ -2,7 +2,9 @@
 
 #include "matador/sql/backend_provider.hpp"
 #include "matador/sql/connection_impl.hpp"
+#include "matador/sql/schema.hpp"
 
+#include <algorithm>
 #include <stdexcept>
 #include <utility>
 
@@ -68,7 +70,7 @@ const connection_info &connection::info() const
   return connection_info_;
 }
 
-record connection::describe(const std::string &table_name) const
+std::vector<sql::column_definition> connection::describe(const std::string &table_name) const
 {
   return std::move(connection_->describe(table_name));
 }
@@ -94,12 +96,21 @@ sql::query connection::query(const sql::schema &schema) const
   return sql::query(*const_cast<connection*>(this), schema);
 }
 
+bool is_unknown(const std::vector<sql::column_definition> &columns) {
+  return std::all_of(std::begin(columns), std::end(columns), [](const auto &col) {
+    return col.type() == data_type_t::type_unknown;
+  });
+}
+
 query_result<record> connection::fetch(const query_context &q) const
 {
-  if (q.prototype.empty() || q.prototype.unknown()) {
+  if (q.prototype.empty() || is_unknown(q.prototype)) {
     const auto table_prototype = describe(q.table.name);
     for (auto &col : q.prototype) {
-      if (const auto rit = table_prototype.find(col.name()); col.type() == data_type_t::type_unknown && rit != table_prototype.end()) {
+      const auto rit = std::find_if(std::begin(table_prototype), std::end(table_prototype), [&col](const auto &value) {
+        return value.name() == col.name();
+      });
+      if (col.type() == data_type_t::type_unknown && rit != table_prototype.end()) {
         const_cast<column_definition&>(col).type(rit->type());
       }
      }

src/sql/field.cpp

@@ -0,0 +1,15 @@
+#include "matador/sql/field.hpp"
+
+namespace matador::sql {
+
+const std::string &field::name() const
+{
+  return name_;
+}
+
+std::ostream &operator<<(std::ostream &out, const field &col)
+{
+  return out;
+}
+
+}

src/sql/noop_connection.cpp

@@ -39,7 +39,7 @@ std::unique_ptr<statement_impl> noop_connection::prepare(query_context context)
   return {};
 }
 
-record noop_connection::describe(const std::string &table)
+std::vector<sql::column_definition> noop_connection::describe(const std::string &table)
 {
   return {};
 }

src/sql/query_builder.cpp

@@ -141,18 +141,18 @@ query_builder &query_builder::select(const std::vector<column> &columns)
     for (const auto &col: columns) {
       result.append(dialect_.prepare_identifier(col));
       query_.result_vars.emplace_back(col.name);
-      query_.prototype.append(column_definition{col.name});
+      query_.prototype.emplace_back(col.name);
     }
   } else {
     auto it = columns.begin();
     result.append(dialect_.prepare_identifier(*it));
     query_.result_vars.emplace_back(it->name);
-    query_.prototype.append(column_definition{(*it++).name});
+    query_.prototype.emplace_back((*it++).name);
     for (; it != columns.end(); ++it) {
       result.append(", ");
       result.append(dialect_.prepare_identifier(*it));
       query_.result_vars.emplace_back(it->name);
-      query_.prototype.append(column_definition{(*it).name});
+      query_.prototype.emplace_back((*it).name);
     }
   }
 

src/sql/query_compiler.cpp

@@ -33,18 +33,18 @@ void query_compiler::visit(query_select_part &select_part)
     for (const auto &col: columns) {
       result.append(dialect_.prepare_identifier(col));
       query_.result_vars.emplace_back(col.name);
-      query_.prototype.append(column_definition{col.name});
+      query_.prototype.emplace_back(col.name);
     }
   } else {
     auto it = columns.begin();
     result.append(dialect_.prepare_identifier(*it));
     query_.result_vars.emplace_back(it->name);
-    query_.prototype.append(column_definition{(*it++).name});
+    query_.prototype.emplace_back((*it++).name);
     for (; it != columns.end(); ++it) {
       result.append(", ");
       result.append(dialect_.prepare_identifier(*it));
       query_.result_vars.emplace_back(it->name);
-      query_.prototype.append(column_definition{(*it).name});
+      query_.prototype.emplace_back((*it).name);
     }
   }
 

src/sql/query_result.cpp

@@ -3,7 +3,7 @@
 namespace matador::sql::detail {
 
 template<>
-record *create_prototype<record>(const record &prototype)
+record *create_prototype<record>(const std::vector<column_definition> &prototype)
 {
   return new record{prototype};
 }

src/sql/query_result_impl.cpp

@@ -11,7 +11,7 @@ void detail::pk_reader::on_primary_key(const char *id, std::string &value, size_
   data_type_traits<std::string>::read_value(reader_, id, column_index_++, value, size);
 }
 
-query_result_impl::query_result_impl(std::unique_ptr<query_result_reader> &&reader, record prototype)
+query_result_impl::query_result_impl(std::unique_ptr<query_result_reader> &&reader, std::vector<column_definition> prototype)
 : prototype_(std::move(prototype))
 , reader_(std::move(reader))
 , pk_reader_(*reader_)
@@ -44,7 +44,7 @@ query_result_impl::on_attribute(const char *id, any_type &value, data_type_t typ
   reader_->read_value(id, column_index_++, value, type, attr.size());
 }
 
-const record& query_result_impl::prototype() const
+const std::vector<column_definition>& query_result_impl::prototype() const
 {
   return prototype_;
 }

src/sql/session.cpp

@@ -71,7 +71,7 @@ statement session::prepare(query_context q) const
   return c->prepare(std::move(q));
 }
 
-record session::describe_table(const std::string &table_name) const
+std::vector<sql::column_definition> session::describe_table(const std::string &table_name) const
 {
   auto c = pool_.acquire();
   if (!c.valid()) {

test/CMakeLists.txt

@@ -35,7 +35,10 @@ add_executable(tests
   models/optional.hpp
   ConvertTest.cpp
   DummyConnection.hpp
-  DummyConnection.cpp)
+  DummyConnection.cpp
+  EntityQueryBuilderTest.cpp
+  models/author.hpp
+  models/book.hpp)
 
 target_link_libraries(tests PRIVATE
   Catch2::Catch2WithMain

test/EntityQueryBuilderTest.cpp

@@ -0,0 +1,11 @@
+#include <catch2/catch_test_macros.hpp>
+
+#include <matador/sql/connection.hpp>
+
+using namespace matador::sql;
+
+TEST_CASE("Create sql query for entity", "[query][entity][builder]") {
+  connection noop("noop://noop.db");
+  schema scm("noop");
+
+}

test/QueryBuilderTest.cpp

@@ -4,7 +4,6 @@
 #include <matador/sql/condition.hpp>
 #include <matador/sql/connection.hpp>
 #include <matador/sql/dialect_builder.hpp>
-#include <matador/sql/query_builder.hpp>
 #include <matador/sql/query.hpp>
 
 using namespace matador::sql;

test/models/author.hpp

@@ -0,0 +1,27 @@
+#ifndef QUERY_AUTHOR_HPP
+#define QUERY_AUTHOR_HPP
+
+#include "matador/utils/access.hpp"
+
+#include <string>
+
+namespace matador::test {
+
+struct category
+{
+  unsigned long id{};
+  std::string name;
+
+  template<class Operator>
+  void process(Operator &op)
+  {
+    namespace field = matador::utils::access;
+    using namespace matador::utils;
+    field::primary_key(op, "id", id);
+    field::attribute(op, "name", name, 255);
+  }
+};
+
+}
+
+#endif //QUERY_AUTHOR_HPP

test/models/book.hpp

@@ -0,0 +1,34 @@
+#ifndef QUERY_BOOK_HPP
+#define QUERY_BOOK_HPP
+
+#include "matador/sql/entity.hpp"
+
+#include "matador/utils/access.hpp"
+#include "matador/utils/foreign_attributes.hpp"
+
+#include <string>
+
+namespace matador::test {
+
+struct author;
+
+struct book
+{
+  unsigned long id{};
+  matador::sql::entity<author> book_author;
+  std::string title;
+  unsigned short published_in{};
+
+  template<typename Operator>
+  void process(Operator &op)
+  {
+    namespace field = matador::utils::access;
+    field::primary_key(op, "id", id);
+    field::attribute(op, "title", title, 511);
+    field::has_one(op, "author_id", book_author, matador::utils::default_foreign_attributes);
+    field::attribute(op, "published_in", published_in);
+  }
+};
+
+}
+#endif //QUERY_BOOK_HPP