Serialization also works and tests added

Tomlet.Tests/TestModelClasses/ComplexTestRecordWithAttributeMapping.cs

@@ -0,0 +1,15 @@
+namespace Tomlet.Tests.TestModelClasses
+{
+    public record ComplexTestRecordWithAttributeMapping
+    {
+        [TomlProperty("string")]
+        public string MyString { get; init; }
+        public WidgetForThisComplexTestRecordWithAttributeMapping MyWidget { get; init; }
+    }
+
+    public record WidgetForThisComplexTestRecordWithAttributeMapping
+    {
+        [TomlProperty("my_int")]
+        public int MyInt { get; init; }
+    }
+}

Tomlet.Tests/TestResources.resx

@@ -330,4 +330,9 @@ MyDateTime = 1970-01-01T07:00:00</value>
     <data name="LiteralQuotedPathWithBackslashesTestInput" xml:space="preserve">
         <value>Args = '"C:\\Something"'</value>
     </data>
+    <data name="ComplexTestRecordForAttributeMapping" xml:space="preserve">
+        <value>string = "Test"
+[MyWidget]
+my_int = 42</value>
+    </data>
 </root>

Tomlet.Tests/TomlPropertyMappingTests.cs

@@ -0,0 +1,26 @@
+using Tomlet.Tests.TestModelClasses;
+using Xunit;
+
+namespace Tomlet.Tests
+{
+    public class TomlPropertyMappingTests
+    {
+        [Fact]
+        public void DeserializationWorks()
+        {
+            var record = TomletMain.To<ComplexTestRecordWithAttributeMapping>(TestResources.ComplexTestRecordForAttributeMapping);
+            Assert.Equal("Test", record.MyString);
+            Assert.IsType<WidgetForThisComplexTestRecordWithAttributeMapping>(record.MyWidget);
+            Assert.Equal(42, record.MyWidget.MyInt);
+        }
+
+        [Fact]
+        public void SerializationWorks()
+        {
+            var testString = TestResources.ComplexTestRecordForAttributeMapping.Trim();
+            var record = TomletMain.To<ComplexTestRecordWithAttributeMapping>(testString);
+            var serialized = TomletMain.TomlStringFrom(record).Trim();
+            Assert.Equal(testString, serialized);
+        }
+    }
+}

Tomlet/TomlSerializationMethods.cs

@@ -279,6 +279,9 @@ internal static Serialize<object> GetCompositeSerializer(Type type)
                         if (m.Success)
                             name = m.Groups[1].Value;
 
+                        var name1 = name;
+                        name = type.GetProperties().FirstOrDefault(p => p.Name == name1)?.GetCustomAttribute<TomlPropertyAttribute>()?.GetMappedString() ?? name;
+
                         if (resultTable.ContainsKey(name))
                             //Do not overwrite fields if they have the same name as something already in the table
                             //This fixes serializing types which re-declare a field using the `new` keyword, overwriting a field of the same name