Add timeonly converter

README.md

@@ -71,6 +71,7 @@ The source generator will look for attributes and implement interfaces that exis
 | Type             | Field | Format   |
 |------------------|-------|----------|
 | `DateOnly`       | `S`   | ISO 8601 |
+| `TimeOnly`       | `S`   | ISO 8601 |
 | `DateTime`       | `S`   | ISO 8601 |
 | `DateTimeOffset` | `S`   | ISO 8601 |
 | `TimeSpan`       | `S`   | ISO 8601 |

src/DynamoDBGenerator/Converters/Internal/ISO8601TimeOnlyConverter.cs

@@ -0,0 +1,17 @@
+using System;
+using Amazon.DynamoDBv2.Model;
+
+namespace DynamoDBGenerator.Converters.Internal;
+
+internal class ISO8601TimeOnlyConverter: IValueTypeConverter<TimeOnly>
+{
+    public TimeOnly? Read(AttributeValue attributeValue)
+    {
+        return TimeOnly.TryParse(attributeValue.S, out var timeOnly) ? timeOnly : null;
+    }
+
+    public AttributeValue Write(TimeOnly element)
+    {
+        return new AttributeValue {S = element.ToString("O")};
+    }
+}

src/DynamoDBGenerator/Options/AttributeValueConverters.cs

@@ -100,6 +100,11 @@ public class AttributeValueConverters
     /// The <see cref="DateOnly"/> converter.
     /// </summary>
     public IValueTypeConverter<DateOnly> DateOnlyConverter { get; protected init; } = new ISO8601DateOnlyConverter();
+
+    /// <summary>
+    /// The <see cref="TimeOnly"/> converter.
+    /// </summary>
+    public IValueTypeConverter<TimeOnly> TimeOnlyConverter { get; protected init; } = new ISO8601TimeOnlyConverter();
 
     /// <summary>
     /// The <see cref="TimeSpan"/> converter.

tests/DynamoDBGenerator.SourceGenerator.Tests/DynamoDBDocumentTests/Marshaller/Types/TimeOnlyTests.cs

@@ -0,0 +1,40 @@
+using Amazon.DynamoDBv2.Model;
+using DynamoDBGenerator.Attributes;
+using DynamoDBGenerator.SourceGenerator.Tests.DynamoDBDocumentTests.Marshaller.Asserters;
+
+namespace DynamoDBGenerator.SourceGenerator.Tests.DynamoDBDocumentTests.Marshaller.Types;
+
+[DynamoDBMarshaller(typeof(Container<TimeOnly>))]
+public partial class TimeOnlyTests : RecordMarshalAsserter<TimeOnly>
+{
+    protected override Container<TimeOnly> UnmarshallImplementation(Dictionary<string, AttributeValue> attributeValues)
+    {
+        return ContainerMarshaller.Unmarshall(attributeValues);
+    }
+    protected override Dictionary<string, AttributeValue> MarshallImplementation(Container<TimeOnly> element)
+    {
+        return ContainerMarshaller.Marshall(element);
+    }
+
+    public TimeOnlyTests() : base(new[] {new TimeOnly(22, 12, 08), new TimeOnly(21, 12, 09)}, x => new AttributeValue {S = x.ToString("O")})
+    {
+    }
+}
+
+[DynamoDBMarshaller(typeof(Container<TimeOnly?>))]
+public partial class NullableTimeOnlyTests : RecordMarshalAsserter<TimeOnly?>
+{
+
+    protected override Container<TimeOnly?> UnmarshallImplementation(Dictionary<string, AttributeValue> attributeValues)
+    {
+        return ContainerMarshaller.Unmarshall(attributeValues);
+    }
+    protected override Dictionary<string, AttributeValue> MarshallImplementation(Container<TimeOnly?> element)
+    {
+        return ContainerMarshaller.Marshall(element);
+    }
+
+    public NullableTimeOnlyTests() : base(new[] {new TimeOnly(22, 12, 08), new TimeOnly(21, 12, 09)}.Cast<TimeOnly?>().Append(null), x => x is null ? null : new AttributeValue {S = x.Value.ToString("O")})
+    {
+    }
+}