// Copyright 2026 The Casdoor Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use serde::{Deserialize, Deserializer};
/// Deserialize a `null` into the default value of the type.
///
/// The Casdoor server is written in Go, where an empty slice or map is marshalled as
/// `null` instead of as `[]` or `{}`, so every collection field of the SDK structs is
/// deserialized through this function.
pub(crate) fn null_to_default<'de, D, T>(deserializer: D) -> Result<T, D::Error>
where
D: Deserializer<'de>,
T: Default + Deserialize<'de>,
{
Ok(Option::<T>::deserialize(deserializer)?.unwrap_or_default())
}