Serde with bytes maps to Blob (#6009)

* Serde with_bytes maps to Blob

* Bump rust flexbuffers minor version number

Co-authored-by: Casper Neo <cneo@google.com>

tests/rust_usage_test/Cargo.toml

@@ -8,6 +8,7 @@ flatbuffers = { path = "../../rust/flatbuffers" }
 flexbuffers = { path = "../../rust/flexbuffers" }
 serde_derive = "1.0"
 serde = "1.0"
+serde_bytes = "0.11"
 
 [[bin]]
 name = "monster_example"

tests/rust_usage_test/tests/flexbuffers_tests/qc_serious.rs

@@ -1,5 +1,3 @@
-#![allow(unused_imports)]
-
 use super::rwyw::NonNullString;
 use flexbuffers::*;
 use quickcheck::{Arbitrary, Gen};
@@ -30,6 +28,7 @@ enum Enum {
         b: Array4<i32>,
         c: Array2<f64>,
     },
+    Blobs(#[serde(with = "serde_bytes")] Vec<u8>),
 }
 
 // There is some upstream bug in deriving Arbitrary for Enum so we manually implement it here.

tests/rust_usage_test/tests/flexbuffers_tests/rwyw.rs

@@ -432,7 +432,16 @@ fn serde_serious() {
     let read = MyTupleStruct::deserialize(reader).unwrap();
     assert_eq!(data, read);
 }
-
+#[test]
+fn serialize_serde_with_bytes_as_blob() {
+    #[derive(Serialize, Deserialize)]
+    struct Foo(#[serde(with = "serde_bytes")] Vec<u8>);
+    let mut s = FlexbufferSerializer::new();
+    Foo(vec![5, 6, 7, 8]).serialize(&mut s).unwrap();
+    let reader = Reader::get_root(s.view()).unwrap();
+    assert_eq!(reader.flexbuffer_type(), FlexBufferType::Blob);
+    assert_eq!(reader.as_blob(), Blob(&[5, 6, 7, 8]));
+}
 #[test]
 fn iter() {
     let mut fxb = Builder::default();