From 7fc16e2a2d678b44f3129fb4610c7d9e06d44b6d Mon Sep 17 00:00:00 2001
From: "Dr. Patrick Urbanke" <patrick@getml.com>
Date: Wed, 9 Apr 2025 09:07:34 +0200
Subject: [PATCH] Added to_select_from

---
 include/sqlgen/parsing/to_select_from.hpp | 36 +++++++++++++++++++++++
 tests/test_to_select_from.cpp             | 26 ++++++++++++++++
 2 files changed, 62 insertions(+)
 create mode 100644 include/sqlgen/parsing/to_select_from.hpp
 create mode 100644 tests/test_to_select_from.cpp

diff --git a/include/sqlgen/parsing/to_select_from.hpp b/include/sqlgen/parsing/to_select_from.hpp
new file mode 100644
index 0000000..0f4fbff
--- /dev/null
+++ b/include/sqlgen/parsing/to_select_from.hpp
@@ -0,0 +1,36 @@
+#ifndef SQLGEN_PARSING_TO_SELECT_FROM_HPP_
+#define SQLGEN_PARSING_TO_SELECT_FROM_HPP_
+
+#include <ranges>
+#include <rfl.hpp>
+#include <string>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+#include "../dynamic/SelectFrom.hpp"
+#include "../dynamic/Table.hpp"
+#include "get_schema.hpp"
+#include "get_tablename.hpp"
+#include "make_columns.hpp"
+
+namespace sqlgen::parsing {
+
+template <class T>
+  requires std::is_class_v<std::remove_cvref_t<T>> &&
+           std::is_aggregate_v<std::remove_cvref_t<T>>
+dynamic::SelectFrom to_select_from() {
+  using NamedTupleType = rfl::named_tuple_t<std::remove_cvref_t<T>>;
+  using Fields = typename NamedTupleType::Fields;
+
+  const auto columns = make_columns<Fields>(
+      std::make_integer_sequence<int, rfl::tuple_size_v<Fields>>());
+
+  return dynamic::SelectFrom{.table = dynamic::Table{.name = get_tablename<T>(),
+                                                     .schema = get_schema<T>()},
+                             .columns = columns};
+}
+
+}  // namespace sqlgen::parsing
+
+#endif
diff --git a/tests/test_to_select_from.cpp b/tests/test_to_select_from.cpp
new file mode 100644
index 0000000..12213f3
--- /dev/null
+++ b/tests/test_to_select_from.cpp
@@ -0,0 +1,26 @@
+#include <gtest/gtest.h>
+
+#include <rfl/json.hpp>
+#include <sqlgen.hpp>
+#include <sqlgen/parsing/to_select_from.hpp>
+
+namespace test_to_select_from {
+
+struct TestTable {
+  std::string field1;
+  int32_t field2;
+  sqlgen::PrimaryKey<uint32_t> id;
+  std::optional<std::string> nullable;
+};
+
+TEST(general, test_to_select_from) {
+  const auto select_from_stmt = sqlgen::parsing::to_select_from<TestTable>();
+
+  const std::string expected =
+      R"({"table":{"name":"TestTable"},"columns":[{"name":"field1","type":{"type":"Text","properties":{"primary":false,"nullable":false}}},{"name":"field2","type":{"type":"Int32","properties":{"primary":false,"nullable":false}}},{"name":"id","type":{"type":"UInt32","properties":{"primary":true,"nullable":false}}},{"name":"nullable","type":{"type":"Text","properties":{"primary":false,"nullable":true}}}]})";
+
+  const auto json_str = rfl::json::write(select_from_stmt);
+
+  EXPECT_EQ(json_str, expected);
+}
+}  // namespace test_to_select_from