Update GenerateFluentApi for ComplexProperty.Property.Charset

Author: trejjam

src/EFCore.MySql/Design/Internal/MySqlAnnotationCodeGenerator.cs

@@ -12,6 +12,7 @@
 using Microsoft.EntityFrameworkCore.Infrastructure;
 using Microsoft.EntityFrameworkCore.Metadata;
 using Microsoft.EntityFrameworkCore.Metadata.Builders;
+using Microsoft.EntityFrameworkCore.Metadata.Internal;
 using Microsoft.EntityFrameworkCore.Utilities;
 using Pomelo.EntityFrameworkCore.MySql.Metadata.Internal;
 
@@ -80,6 +81,12 @@ private static readonly MethodInfo _propertyHasCharSetMethodInfo
                 typeof(PropertyBuilder),
                 typeof(string));
 
+        private static readonly MethodInfo _complexTypePropertyHasCharSetMethodInfo
+            = typeof(MySqlComplexTypePropertyBuilderExtensions).GetRequiredRuntimeMethod(
+                nameof(MySqlComplexTypePropertyBuilderExtensions.HasCharSet),
+                typeof(ComplexTypePropertyBuilder),
+                typeof(string));
+
         public MySqlAnnotationCodeGenerator([JetBrains.Annotations.NotNull] AnnotationCodeGeneratorDependencies dependencies)
             : base(dependencies)
         {
@@ -262,6 +269,13 @@ protected override MethodCallCodeFragment GenerateFluentApi(IProperty property,
             switch (annotation.Name)
             {
                 case MySqlAnnotationNames.CharSet when annotation.Value is string { Length: > 0 } charSet:
+                    if (property.DeclaringType is IComplexType)
+                    {
+                        return new MethodCallCodeFragment(
+                            _complexTypePropertyHasCharSetMethodInfo,
+                            charSet);
+                    }
+
                     return new MethodCallCodeFragment(
                         _propertyHasCharSetMethodInfo,
                         charSet);