fixed postgres tests

include/matador/orm/session.hpp

@@ -26,7 +26,7 @@ public:
   explicit session(sql::connection_pool<sql::connection> &pool);
 
   template<typename Type>
-  [[nodiscard]] utils::result<void, utils::error> attach(const std::string &table_name);
+  [[nodiscard]] utils::result<void, utils::error> attach(const std::string &table_name) const;
 
   utils::result<void, utils::error> create_schema() const;
 
@@ -58,6 +58,9 @@ public:
     auto obj = build_select_query(data.release()).template fetch_one<Type>(*c);
 
     if (!obj) {
+      return utils::failure(obj.err());
+    }
+    if (!obj->get()) {
       return utils::failure(make_error(error_code::FailedToFindObject, "Failed to find object of type " + info->get().name() + " with primary key " + std::to_string(pk) + "."));
     }
     return utils::ok(object::object_ptr<Type>{ obj.release() });
@@ -104,8 +107,8 @@ public:
   }
 
   template<typename Type>
-  void drop_table();
-  void drop_table(const std::string &table_name) const;
+  utils::result<void, utils::error> drop_table();
+  utils::result<void, utils::error> drop_table(const std::string &table_name) const;
 
   [[nodiscard]] utils::result<sql::query_result<sql::record>, utils::error> fetch(const sql::query_context &q) const;
 //  [[nodiscard]] query_result<record> fetch(const std::string &sql) const;
@@ -133,8 +136,7 @@ private:
 };
 
 template<typename Type>
-[[nodiscard]] utils::result<void, utils::error> session::attach(const std::string &table_name)
-{
+[[nodiscard]] utils::result<void, utils::error> session::attach(const std::string &table_name) const {
   return schema_->attach<Type>(table_name);
 }
 
@@ -159,13 +161,14 @@ utils::result<object::object_ptr<Type>, utils::error> session::insert(Type *obj)
 }
 
 template<typename Type>
-void session::drop_table()
-{
+utils::result<void, utils::error> session::drop_table() {
   auto info = schema_->info<Type>();
   if (info) {
-    return drop_table(info.name);
+    return drop_table(info->get().name());
   }
 
+  return utils::failure(info.err());
 }
+
 }
 #endif //QUERY_SESSION_HPP

include/matador/orm/session_query_builder.hpp

@@ -62,10 +62,10 @@ private:
 
 struct entity_query_data {
   std::string root_table_name;
-  std::string pk_column_;
-  std::vector<sql::column> columns;
-  std::vector<query::join_data> joins;
-  std::unique_ptr<query::basic_condition> where_clause;
+  std::string pk_column_{};
+  std::vector<sql::column> columns{};
+  std::vector<query::join_data> joins{};
+  std::unique_ptr<query::basic_condition> where_clause{};
 };
 
 enum class query_build_error : std::uint8_t {
@@ -175,7 +175,7 @@ public:
   }
 
   template<class ContainerType>
-  void on_has_many(const char * id, ContainerType &, const char *join_column, const utils::foreign_attributes &attr) {
+  void on_has_many(const char * /*id*/, ContainerType &, const char *join_column, const utils::foreign_attributes &attr) {
     if (attr.fetch() == utils::fetch_type::EAGER) {
       const auto info = schema_.info<typename ContainerType::value_type::value_type>();
       if (!info) {