Fix issue with Option serialization (#10705)

# Objective

- Fix #10499 

## Solution

- Use `.get_represented_type_info()` module path and type ident instead
of `.reflect_*` module path and type ident when serializing the `Option`
enum

---

## Changelog

- Fix serialization bug
- Add simple test
  - Add `serde_json` dev dependency
- Add `serde` with `derive` feature dev dependency (wouldn't compile for
me without it)

---------

Co-authored-by: hank <hank@hank.co.in>
Co-authored-by: Gino Valente <49806985+MrGVSV@users.noreply.github.com>

crates/bevy_reflect/Cargo.toml

@@ -42,6 +42,8 @@ smol_str = { version = "0.2.0", optional = true }
 ron = "0.8.0"
 rmp-serde = "1.1"
 bincode = "1.3"
+serde_json = "1.0"
+serde = { version = "1", features = ["derive"] }
 
 [[example]]
 name = "reflect_docs"

crates/bevy_reflect/src/serde/ser.rs

@@ -317,8 +317,8 @@ impl<'a> Serialize for EnumSerializer<'a> {
 
         match variant_type {
             VariantType::Unit => {
-                if self.enum_value.reflect_module_path() == Some("core::option")
-                    && self.enum_value.reflect_type_ident() == Some("Option")
+                if type_info.type_path_table().module_path() == Some("core::option")
+                    && type_info.type_path_table().ident() == Some("Option")
                 {
                     serializer.serialize_none()
                 } else {
@@ -352,10 +352,9 @@ impl<'a> Serialize for EnumSerializer<'a> {
             }
             VariantType::Tuple if field_len == 1 => {
                 let field = self.enum_value.field_at(0).unwrap();
-                if self
-                    .enum_value
-                    .reflect_type_path()
-                    .starts_with("core::option::Option")
+
+                if type_info.type_path_table().module_path() == Some("core::option")
+                    && type_info.type_path_table().ident() == Some("Option")
                 {
                     serializer.serialize_some(&TypedReflectSerializer::new(field, self.registry))
                 } else {
@@ -464,8 +463,8 @@ impl<'a> Serialize for ArraySerializer<'a> {
 
 #[cfg(test)]
 mod tests {
-    use crate as bevy_reflect;
     use crate::serde::ReflectSerializer;
+    use crate::{self as bevy_reflect, Struct};
     use crate::{Reflect, ReflectSerialize, TypeRegistry};
     use bevy_utils::HashMap;
     use ron::extensions::Extensions;
@@ -881,4 +880,43 @@ mod tests {
 
         assert_eq!(expected, bytes);
     }
+
+    #[test]
+    fn should_serialize_dynamic_option() {
+        #[derive(Default, Reflect)]
+        struct OtherStruct {
+            some: Option<SomeStruct>,
+            none: Option<SomeStruct>,
+        }
+
+        let value = OtherStruct {
+            some: Some(SomeStruct { foo: 999999999 }),
+            none: None,
+        };
+        let dynamic = value.clone_dynamic();
+        let reflect = dynamic.as_reflect();
+
+        let registry = get_registry();
+
+        let serializer = ReflectSerializer::new(reflect, &registry);
+
+        let mut buf = Vec::new();
+
+        let format = serde_json::ser::PrettyFormatter::with_indent(b"    ");
+        let mut ser = serde_json::Serializer::with_formatter(&mut buf, format);
+
+        serializer.serialize(&mut ser).unwrap();
+
+        let output = std::str::from_utf8(&buf).unwrap();
+        let expected = r#"{
+    "bevy_reflect::serde::ser::tests::OtherStruct": {
+        "some": {
+            "foo": 999999999
+        },
+        "none": null
+    }
+}"#;
+
+        assert_eq!(expected, output);
+    }
 }