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// Tests for skip_null_members_on_read option
// This option allows reading JSON with null values without requiring std::optional
#include "glaze/glaze.hpp"
#include "ut/ut.hpp"
using namespace ut;
struct simple_struct
{
std::string name = "default";
int age = 0;
double score = 0.0;
};
template <>
struct glz::meta<simple_struct>
{
using T = simple_struct;
static constexpr auto value = glz::object(&T::name, &T::age, &T::score);
};
// Custom options with skip_null_members_on_read enabled
struct opts_skip_null : glz::opts
{
bool skip_null_members_on_read = true;
};
suite skip_null_on_read_basic_tests = [] {
"skip null string field"_test = [] {
constexpr opts_skip_null opts{};
simple_struct obj{};
obj.name = "original";
obj.age = 25;
obj.score = 100.0;
std::string json = R"({"name":null,"age":30,"score":95.5})";
auto ec = glz::read<opts>(obj, json);
// Should succeed - null is skipped
expect(!ec) << "Error: " << glz::format_error(ec, json);
// name should retain its original value since null was skipped
expect(obj.name == "original");
expect(obj.age == 30);
expect(obj.score == 95.5);
};
"skip null int field"_test = [] {
constexpr opts_skip_null opts{};
simple_struct obj{};
obj.name = "test";
obj.age = 25;
obj.score = 100.0;
std::string json = R"({"name":"John","age":null,"score":95.5})";
auto ec = glz::read<opts>(obj, json);
expect(!ec) << "Error: " << glz::format_error(ec, json);
expect(obj.name == "John");
expect(obj.age == 25); // Retains original value
expect(obj.score == 95.5);
};
"skip null double field"_test = [] {
constexpr opts_skip_null opts{};
simple_struct obj{};
obj.name = "test";
obj.age = 25;
obj.score = 100.0;
std::string json = R"({"name":"Jane","age":30,"score":null})";
auto ec = glz::read<opts>(obj, json);
expect(!ec) << "Error: " << glz::format_error(ec, json);
expect(obj.name == "Jane");
expect(obj.age == 30);
expect(obj.score == 100.0); // Retains original value
};
"skip multiple null fields"_test = [] {
constexpr opts_skip_null opts{};
simple_struct obj{};
obj.name = "original";
obj.age = 25;
obj.score = 100.0;
std::string json = R"({"name":null,"age":null,"score":null})";
auto ec = glz::read<opts>(obj, json);
expect(!ec) << "Error: " << glz::format_error(ec, json);
// All fields should retain their original values
expect(obj.name == "original");
expect(obj.age == 25);
expect(obj.score == 100.0);
};
"mixed null and non-null fields"_test = [] {
constexpr opts_skip_null opts{};
simple_struct obj{};
obj.name = "original";
obj.age = 25;
obj.score = 100.0;
std::string json = R"({"name":"updated","age":null,"score":75.5})";
auto ec = glz::read<opts>(obj, json);
expect(!ec) << "Error: " << glz::format_error(ec, json);
expect(obj.name == "updated");
expect(obj.age == 25); // Null was skipped
expect(obj.score == 75.5);
};
"default behavior - option disabled"_test = [] {
// Default opts has skip_null_members_on_read = false
simple_struct obj{};
obj.name = "original";
obj.age = 25;
obj.score = 100.0;
std::string json = R"({"name":null,"age":30,"score":95.5})";
auto ec = glz::read_json(obj, json);
// Should error because string doesn't accept null without being optional
expect(bool(ec)) << "Expected error when reading null into non-nullable type";
};
};
// Test with optional fields to ensure they still work correctly
struct struct_with_optional
{
std::string required_name = "default";
std::optional<int> optional_age = std::nullopt;
std::optional<std::string> optional_nickname = std::nullopt;
};
template <>
struct glz::meta<struct_with_optional>
{
using T = struct_with_optional;
static constexpr auto value = glz::object(&T::required_name, &T::optional_age, &T::optional_nickname);
};
suite skip_null_on_read_with_optional_tests = [] {
"optional fields with null - option enabled"_test = [] {
constexpr opts_skip_null opts{};
struct_with_optional obj{};
obj.required_name = "original";
obj.optional_age = 25;
obj.optional_nickname = "Nick";
std::string json = R"({"required_name":null,"optional_age":null,"optional_nickname":null})";
auto ec = glz::read<opts>(obj, json);
expect(!ec) << "Error: " << glz::format_error(ec, json);
// With skip_null_members_on_read, even optional fields should skip null
expect(obj.required_name == "original");
expect(obj.optional_age == 25);
expect(obj.optional_nickname == "Nick");
};
"optional fields with null - option disabled"_test = [] {
struct_with_optional obj{};
obj.optional_age = 25;
obj.optional_nickname = "Nick";
std::string json = R"({"required_name":"test","optional_age":null,"optional_nickname":null})";
auto ec = glz::read_json(obj, json);
expect(!ec) << "Error: " << glz::format_error(ec, json);
// Without skip_null_members_on_read, optional fields are reset on null
expect(obj.required_name == "test");
expect(!obj.optional_age.has_value());
expect(!obj.optional_nickname.has_value());
};
};
// Test with nested objects
struct nested_inner
{
int value = 0;
};
template <>
struct glz::meta<nested_inner>
{
using T = nested_inner;
static constexpr auto value = glz::object(&T::value);
};
struct nested_outer
{
std::string name = "default";
nested_inner inner;
};
template <>
struct glz::meta<nested_outer>
{
using T = nested_outer;
static constexpr auto value = glz::object(&T::name, &T::inner);
};
suite skip_null_on_read_nested_tests = [] {
"skip null in nested object field"_test = [] {
constexpr opts_skip_null opts{};
nested_outer obj{};
obj.name = "test";
obj.inner.value = 42;
std::string json = R"({"name":"updated","inner":{"value":null}})";
auto ec = glz::read<opts>(obj, json);
expect(!ec) << "Error: " << glz::format_error(ec, json);
expect(obj.name == "updated");
expect(obj.inner.value == 42); // Null was skipped
};
};
// Test with empty string vs null
suite skip_null_on_read_edge_cases = [] {
"empty string is not null"_test = [] {
constexpr opts_skip_null opts{};
simple_struct obj{};
obj.name = "original";
std::string json = R"({"name":"","age":30,"score":95.5})";
auto ec = glz::read<opts>(obj, json);
expect(!ec) << "Error: " << glz::format_error(ec, json);
expect(obj.name == ""); // Empty string is valid, not null
expect(obj.age == 30);
expect(obj.score == 95.5);
};
"whitespace around null"_test = [] {
constexpr opts_skip_null opts{};
simple_struct obj{};
obj.name = "original";
obj.age = 25;
std::string json = R"({"name": null , "age":30,"score":95.5})";
auto ec = glz::read<opts>(obj, json);
expect(!ec) << "Error: " << glz::format_error(ec, json);
expect(obj.name == "original"); // Null was skipped
expect(obj.age == 30);
};
};
int main() {}
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