feat: add try_get_deserialized (#2042)

crates/serde/src/other/mod.rs

@@ -1,6 +1,6 @@
 //! Support for capturing other fields.
 
-use alloc::{collections::BTreeMap, string::String};
+use alloc::{collections::BTreeMap, format, string::String};
 use core::{
     fmt,
     ops::{Deref, DerefMut},
@@ -75,6 +75,18 @@ impl OtherFields {
         self.get_with(key, serde_json::from_value)
     }
 
+    /// Returns the deserialized value of the field.
+    ///
+    /// Returns an error if the field is missing
+    pub fn try_get_deserialized<V: DeserializeOwned>(
+        &self,
+        key: impl AsRef<str>,
+    ) -> serde_json::Result<V> {
+        let key = key.as_ref();
+        self.get_deserialized(key)
+            .ok_or_else(|| serde::de::Error::custom(format!("Missing field `{}`", key)))?
+    }
+
     /// Removes the deserialized value of the field, if it exists
     ///
     /// **Note:** this will also remove the value if deserializing it resulted in an error