Respect serialize_with attr when serializing default

schemars/tests/remote_derive.rs

@@ -2,31 +2,40 @@ mod util;
 
 use other_crate::Duration;
 use schemars::JsonSchema;
+use serde::Serialize;
 use util::*;
 
 mod other_crate {
-    #[derive(Debug)]
+    #[derive(Debug, Default)]
     pub struct Duration {
         pub secs: i64,
         pub nanos: i32,
     }
 }
 
-#[derive(Debug, JsonSchema)]
+#[derive(Debug, JsonSchema, Serialize)]
 #[serde(remote = "Duration")]
 struct DurationDef {
     secs: i64,
     nanos: i32,
 }
 
-#[derive(Debug, JsonSchema)]
+fn custom_serialize<S>(value: &Duration, ser: S) -> Result<S::Ok, S::Error>
+where
+    S: serde::Serializer,
+{
+    ser.collect_str(&format_args!("{}.{:09}s", value.secs, value.nanos))
+}
+
+#[derive(Debug, JsonSchema, Serialize)]
 struct Process {
     command_line: String,
     #[serde(with = "DurationDef")]
     wall_time: Duration,
-    #[serde(with = "DurationDef")]
+    #[serde(default, with = "DurationDef")]
     user_cpu_time: Duration,
-    #[serde(deserialize_with = "some_serialize_function")]
+    // FIXME this should serialize the default as "0.000000000s"
+    #[serde(default, serialize_with = "custom_serialize")]
     #[schemars(with = "DurationDef")]
     system_cpu_time: Duration,
 }