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fix(config): preserve explicit null when merging objects

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This commit is contained in:
Aleksei Bavshin
2021-09-15 22:14:12 +07:00
parent ccc60b4245
commit 0c1d3e30b6
4 changed files with 13 additions and 4 deletions
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9
src/config.cpp
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@@ -1,5 +1,6 @@
#include "config.hpp"
#include <fmt/ostream.h>
#include <spdlog/spdlog.h>
#include <unistd.h>
#include <wordexp.h>
@@ -86,11 +87,15 @@ void Config::mergeConfig(Json::Value &a_config_, Json::Value &b_config_) {
a_config_ = b_config_;
} else if (a_config_.isObject() && b_config_.isObject()) {
for (const auto &key : b_config_.getMemberNames()) {
if (a_config_[key].isObject() && b_config_[key].isObject()) {
// [] creates key with default value. Use `get` to avoid that.
if (a_config_.get(key, Json::Value::nullSingleton()).isObject() &&
b_config_[key].isObject()) {
mergeConfig(a_config_[key], b_config_[key]);
} else if (a_config_[key].isNull()) {
} else if (!a_config_.isMember(key)) {
// do not allow overriding value set by top or previously included config
a_config_[key] = b_config_[key];
} else {
spdlog::trace("Option {} is already set; ignoring value {}", key, b_config_[key]);
}
}
} else {