From 53ad6efb657c0661d27eedf0dcb27b5f1c5a3631 Mon Sep 17 00:00:00 2001
From: Jacyking <791026912@qq.com>
Date: Fri, 18 Aug 2023 14:01:01 +0800
Subject: [PATCH] add get_fields api

---
 iguana/reflection.hpp | 18 ------------------
 include/utility.hpp   | 18 ++++++++++++++++--
 2 files changed, 16 insertions(+), 20 deletions(-)

diff --git a/iguana/reflection.hpp b/iguana/reflection.hpp
index f9eb9de4..f4ee98fe 100644
--- a/iguana/reflection.hpp
+++ b/iguana/reflection.hpp
@@ -614,18 +614,6 @@ constexpr std::array<frozen::string, N> get_alias_arr(Args... pairs) {
       constexpr static std::string_view struct_name() {                       \
         return std::string_view(#STRUCT_NAME, sizeof(#STRUCT_NAME) - 1);      \
       }                                                                       \
-      static std::string_view fields() {                                      \
-        static std::string alisa_fields;                                      \
-        if (!alisa_fields.empty()) {                                          \
-          return alisa_fields;                                                \
-        }                                                                     \
-        for (const auto &it : arr()) {                                        \
-          alisa_fields += it.data();                                          \
-          alisa_fields += ",";                                                \
-        }                                                                     \
-        alisa_fields.back() = ' ';                                            \
-        return alisa_fields;                                                  \
-      }                                                                       \
       constexpr static size_t value() { return size_type::value; }            \
       constexpr static std::array<frozen::string, size_type::value> arr() {   \
         return iguana::detail::get_alias_arr<size_type::value>(__VA_ARGS__);  \
@@ -923,12 +911,6 @@ constexpr const std::string_view get_name() {
   return M::name();
 }
 
-template <typename T>
-constexpr const std::string_view get_fields() {
-  using M = Reflect_members<T>;
-  return M::fields();
-}
-
 template <typename T>
 constexpr std::enable_if_t<is_reflection<T>::value, size_t> get_value() {
   using M = decltype(iguana_reflect_type(std::declval<T>()));
diff --git a/include/utility.hpp b/include/utility.hpp
index 8934de4a..19af0c10 100644
--- a/include/utility.hpp
+++ b/include/utility.hpp
@@ -144,12 +144,26 @@ inline std::string get_name() {
   return quota_name;
 }
 
+template <typename T, typename = std::enable_if_t<iguana::is_reflection_v<T>>>
+inline std::string get_fields() {
+  static std::string alisa_fields;
+  if (!alisa_fields.empty()) {
+    return alisa_fields;
+  }
+  for (const auto &it : iguana::Reflect_members<T>::arr()) {
+    alisa_fields += it.data();
+    alisa_fields += ",";
+  }
+  alisa_fields.back() = ' ';
+  return alisa_fields;
+}
+
 template <typename T>
 inline std::string generate_insert_sql(bool replace) {
   std::string sql = replace ? "replace into " : "insert into ";
   constexpr size_t SIZE = iguana::get_value<T>();
   auto name = get_name<T>();
-  auto fields = iguana::get_fields<T>();
+  auto fields = get_fields<T>();
   append(sql, name.data(), "(", fields.data(), ")", "values(");
 
   for (size_t i = 0; i < SIZE; ++i) {
@@ -257,7 +271,7 @@ inline std::string generate_query_sql(Args &&...args) {
   static_assert(param_size == 0 || param_size > 0);
   std::string sql = "select ";
   auto name = get_name<T>();
-  auto fields = iguana::get_fields<T>();
+  auto fields = get_fields<T>();
   append(sql, fields.data(), "from", name.data());
 
   std::string where_sql = "";