Added support for substreams::Hex type which converts to string i…

…n hexadecimal form.

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.1.2]
+
+* Added support for `substreams::Hex` type which converts to `string` in hexadecimal form.
+
 ## [0.1.1](https://github.com/streamingfast/substreams-database-change/releases/tag/v0.1.1)
 
 * Added support for `prost::Timestamp` type.

src/change.rs

@@ -5,6 +5,7 @@ use substreams::scalar::{BigDecimal, BigInt};
 use substreams::store::{
     DeltaBigDecimal, DeltaBigInt, DeltaBool, DeltaBytes, DeltaInt32, DeltaInt64, DeltaString,
 };
+use substreams::Hex;
 
 pub trait ToField {
     fn to_field<N: AsRef<str>>(self, name: N) -> Field;
@@ -45,6 +46,18 @@ impl_as_string_via_to_string!(&BigInt);
 impl_as_string_via_to_string!(::prost_types::Timestamp);
 impl_as_string_via_to_string!(&::prost_types::Timestamp);
 
+impl<T: AsRef<[u8]>> AsString for Hex<T> {
+    fn as_string(self) -> String {
+        self.to_string()
+    }
+}
+
+impl<T: AsRef<[u8]>> AsString for &Hex<T> {
+    fn as_string(self) -> String {
+        self.to_string()
+    }
+}
+
 impl AsString for Vec<u8> {
     fn as_string(self) -> String {
         base64::encode(self)