More work on todo list support

src/web/mod.rs

@@ -5,6 +5,46 @@ mod catchers;
 mod guards;
 mod metrics;
 mod routes;
+pub mod string {
+    use std::{fmt::Display, str::FromStr};
+
+    use serde::{de, Deserialize, Deserializer, Serializer};
+
+    pub fn serialize<T, S>(value: &T, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        T: Display,
+        S: Serializer,
+    {
+        serializer.collect_str(value)
+    }
+
+    pub fn deserialize<'de, T, D>(deserializer: D) -> Result<T, D::Error>
+    where
+        T: FromStr,
+        T::Err: Display,
+        D: Deserializer<'de>,
+    {
+        String::deserialize(deserializer)?.parse().map_err(de::Error::custom)
+    }
+}
+
+pub mod string_opt {
+    use std::fmt::Display;
+
+    use serde::{Deserializer, Serializer};
+
+    pub fn serialize<T, S>(value: &Option<T>, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        T: Display,
+        S: Serializer,
+    {
+        if let Some(v) = value {
+            serializer.collect_str(v)
+        } else {
+            serializer.serialize_none()
+        }
+    }
+}
 
 use std::{env, path::Path};