implemented lazy loading for object_ptr and belongs_to

source/orm/sql/record.cpp

@@ -70,9 +70,25 @@ record::const_iterator record::find(const std::string &column_name) const {
   return it != fields_by_name_.end() ? fields_.begin() + it->second.second : fields_.end();
 }
 
+bool record::operator==(const record &rhs) const {
+  if (size() != rhs.size()) {
+    return false;
+  }
+  for(size_t i = 0; i < size(); ++i) {
+    if (at(i) != rhs.at(i)) {
+      return false;
+    }
+  }
+  return true;
+}
+
+bool record::operator!=(const record &rhs) const {
+  return !operator==(rhs);
+}
+
 void record::append(const field &col) {
-  const auto it = fields_by_name_.emplace(col.name(), field_index_pair {col, fields_.size()});
-  fields_.push_back(std::ref(it.first->second.first));
+  const auto [fst, snd] = fields_by_name_.emplace(col.name(), field_index_pair {col, fields_.size()});
+  fields_.push_back(std::ref(fst->second.first));
 }
 
 record::iterator record::begin()