feat: Add a named variant for rmp_serde_1_3

And advise to use it if advanced serde features are in use.

README.md

@@ -103,6 +103,8 @@ There are known issues with some `serde` advanced features such as:
 
 Or types implementing similar strategies such as [`serde_json::Value`][serde_json_value].
 
+The `rmp-serde` serialization format can optionally support them serializing structs as maps, the `RmpSerdeNamed` struct is provided to support this use-case.
+
 [serde_json_value]: https://docs.rs/serde_json/latest/serde_json/enum.Value.html
 
 ## Data model

src/codec/rmp_serde_1_3.rs

@@ -1,11 +1,15 @@
 //! [rmp-serde 1.3](https://crates.io/crates/rmp-serde/1.3.0) ·
 //! Enable the `rmp_serde_1_3` feature and
 //! [`annotate your type`](crate::native_model) with
-//! `native_model::rmp_serde_1_3::RmpSerde` to have `native_db` use this crate.
+//! `native_model::rmp_serde_1_3::RmpSerde` or `native_model::rmp_serde_1_3::RmpSerdeNamed`
+//! to have `native_db` use this crate.
 
 /// Used to specify the
 /// [rmp-serde 1.3](https://crates.io/crates/rmp-serde/1.3.0)
-/// crate for serialization & deserialization.
+/// crate for serialization & deserialization, using arrays to serialize structs.
+///
+/// Do not use this if you plan to use serde features that skip serializing fields,
+/// use [RmpSerdeNamed] instead.
 ///
 /// # Basic usage
 ///
@@ -43,3 +47,45 @@ impl<T: for<'de> serde::Deserialize<'de>> crate::Decode<T> for RmpSerde {
         rmp_serde_1_3::decode::from_slice(&data)
     }
 }
+
+/// Used to specify the
+/// [rmp-serde 1.3](https://crates.io/crates/rmp-serde/1.3.0)
+/// crate for serialization & deserialization, using maps to serialize structs.
+///
+/// # Basic usage
+///
+/// After enabling the `rmp_serde_1_3` feature in your `Cargo.toml`, use the
+/// [`with`](crate::native_model) attribute on your type to instruct
+/// `native_model` to use `RmpSerdeNamed` for serialization & deserialization.
+///
+/// Example usage:
+///
+/// ```rust
+/// # use native_model::*;
+/// #[derive(Clone, Default, serde::Deserialize, serde::Serialize)]
+/// #[native_model(id = 1, version = 1, with = native_model::rmp_serde_1_3::RmpSerdeNamed)]
+/// struct MyStruct {
+///     #[serde(skip_serializing_if = "String::is_empty")]
+///     my_string: String
+/// }
+/// ```
+
+pub struct RmpSerdeNamed;
+
+#[cfg(all(feature = "serde", feature = "rmp_serde_1_3"))]
+impl<T: serde::Serialize> crate::Encode<T> for RmpSerdeNamed {
+    type Error = rmp_serde_1_3::encode::Error;
+    /// Serializes a type into bytes using the `rmp-serde` `1.3` crate.
+    fn encode(obj: &T) -> Result<Vec<u8>, Self::Error> {
+        rmp_serde_1_3::encode::to_vec_named(obj)
+    }
+}
+
+#[cfg(all(feature = "serde", feature = "rmp_serde_1_3"))]
+impl<T: for<'de> serde::Deserialize<'de>> crate::Decode<T> for RmpSerdeNamed {
+    type Error = rmp_serde_1_3::decode::Error;
+    /// Deserializes a type from bytes using the `rmp-serde` `1.3` crate.
+    fn decode(data: Vec<u8>) -> Result<T, Self::Error> {
+        rmp_serde_1_3::decode::from_slice(&data)
+    }
+}