Add AnyUserData::wrap_ser function

Author: khvzak

src/userdata.rs

@@ -1116,6 +1116,16 @@ impl AnyUserData {
     pub fn wrap<T: MaybeSend + 'static>(data: T) -> impl IntoLua {
         WrappedUserdata(move |lua| lua.create_any_userdata(data))
     }
+
+    /// Wraps any Rust type that implements [`Serialize`], returning an opaque type that implements
+    /// [`IntoLua`] trait.
+    ///
+    /// This function uses [`Lua::create_ser_any_userdata()`] under the hood.
+    #[cfg(feature = "serialize")]
+    #[cfg_attr(docsrs, doc(cfg(feature = "serialize")))]
+    pub fn wrap_ser<T: Serialize + MaybeSend + 'static>(data: T) -> impl IntoLua {
+        WrappedUserdata(move |lua| lua.create_ser_any_userdata(data))
+    }
 }
 
 impl<F> IntoLua for WrappedUserdata<F>

tests/serde.rs

@@ -4,8 +4,8 @@ use std::collections::HashMap;
 use std::error::Error as StdError;
 
 use mlua::{
-    DeserializeOptions, Error, ExternalResult, Lua, LuaSerdeExt, Result as LuaResult, SerializeOptions,
-    UserData, Value,
+    AnyUserData, DeserializeOptions, Error, ExternalResult, IntoLua, Lua, LuaSerdeExt, Result as LuaResult,
+    SerializeOptions, UserData, Value,
 };
 use serde::{Deserialize, Serialize};
 
@@ -72,18 +72,30 @@ fn test_serialize() -> Result<(), Box<dyn StdError>> {
 }
 
 #[test]
-fn test_serialize_any_userdata() -> Result<(), Box<dyn StdError>> {
+fn test_serialize_any_userdata() {
     let lua = Lua::new();
 
     let json_val = serde_json::json!({
         "a": 1,
         "b": "test",
     });
-    let json_ud = lua.create_ser_any_userdata(json_val)?;
-    let json_str = serde_json::to_string_pretty(&json_ud)?;
+    let json_ud = lua.create_ser_any_userdata(json_val).unwrap();
+    let json_str = serde_json::to_string_pretty(&json_ud).unwrap();
     assert_eq!(json_str, "{\n  \"a\": 1,\n  \"b\": \"test\"\n}");
+}
 
-    Ok(())
+#[test]
+fn test_serialize_wrapped_any_userdata() {
+    let lua = Lua::new();
+
+    let json_val = serde_json::json!({
+        "a": 1,
+        "b": "test",
+    });
+    let ud = AnyUserData::wrap_ser(json_val);
+    let json_ud = ud.into_lua(&lua).unwrap();
+    let json_str = serde_json::to_string(&json_ud).unwrap();
+    assert_eq!(json_str, "{\"a\":1,\"b\":\"test\"}");
 }
 
 #[test]