Handle generic types in proto message name generation

Generic types like Translation<T> now produce qualified message names
(e.g. TranslationOfFaqTranslationQueryItem) to avoid duplicate message
definitions in generated .proto files.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Svrnty.CQRS.DynamicQuery/DynamicQueryHandlerBase.cs

@@ -1,6 +1,9 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.Globalization;
 using System.Linq;
+using System.Reflection;
 using System.Threading;
 using System.Threading.Tasks;
 using Svrnty.CQRS.DynamicQuery.Abstractions;
@@ -16,10 +19,13 @@ public abstract class DynamicQueryHandlerBase<TSource, TDestination>
     private readonly IQueryHandlerAsync _queryHandlerAsync;
     private readonly IEnumerable<IQueryableProvider<TSource>> _queryableProviders;
     private readonly IEnumerable<IAlterQueryableService<TSource, TDestination>> _alterQueryableServices;
-    private readonly IEnumerable<IDynamicQueryInterceptorProvider<TSource, TDestination>> _dynamicQueryInterceptorProviders;
+
+    private readonly IEnumerable<IDynamicQueryInterceptorProvider<TSource, TDestination>>
+        _dynamicQueryInterceptorProviders;
+
     private readonly IServiceProvider _serviceProvider;
 
-    public DynamicQueryHandlerBase(IQueryHandlerAsync queryHandlerAsync, 
+    public DynamicQueryHandlerBase(IQueryHandlerAsync queryHandlerAsync,
         IEnumerable<IQueryableProvider<TSource>> queryableProviders,
         IEnumerable<IAlterQueryableService<TSource, TDestination>> alterQueryableServices,
         IEnumerable<IDynamicQueryInterceptorProvider<TSource, TDestination>> dynamicQueryInterceptorProviders,
@@ -32,7 +38,8 @@ public abstract class DynamicQueryHandlerBase<TSource, TDestination>
         _serviceProvider = serviceProvider;
     }
 
-    protected virtual Task<IQueryable<TSource>> GetQueryableAsync(IDynamicQuery query, CancellationToken cancellationToken = default)
+    protected virtual Task<IQueryable<TSource>> GetQueryableAsync(IDynamicQuery query,
+        CancellationToken cancellationToken = default)
     {
         if (_queryableProviders.Any())
         {
@@ -56,7 +63,8 @@ public abstract class DynamicQueryHandlerBase<TSource, TDestination>
             yield return _serviceProvider.GetService(type) as IQueryInterceptor;
     }
 
-    protected async Task<IQueryExecutionResult<TDestination>> ProcessQueryAsync(IDynamicQuery query, CancellationToken cancellationToken = default)
+    protected async Task<IQueryExecutionResult<TDestination>> ProcessQueryAsync(IDynamicQuery query,
+        CancellationToken cancellationToken = default)
     {
         var source = await GetQueryableAsync(query, cancellationToken);
         source = await AlterSourceAsync(source, query, cancellationToken);
@@ -67,11 +75,13 @@ public abstract class DynamicQueryHandlerBase<TSource, TDestination>
             _queryHandlerAsync.AddInterceptor(interceptor);
 
         var criteria = CreateCriteriaFromQuery(query);
-        var result = await _queryHandlerAsync.ExecuteAsync<TSource, TDestination>(source, criteria, options, cancellationToken);
+        var result =
+            await _queryHandlerAsync.ExecuteAsync<TSource, TDestination>(source, criteria, options, cancellationToken);
         return result;
     }
 
-    protected virtual async Task<IQueryable<TSource>> AlterSourceAsync(IQueryable<TSource> source, IDynamicQuery query, CancellationToken cancellationToken)
+    protected virtual async Task<IQueryable<TSource>> AlterSourceAsync(IQueryable<TSource> source, IDynamicQuery query,
+        CancellationToken cancellationToken)
     {
         foreach (var t in _alterQueryableServices)
             source = await t.AlterQueryableAsync(source, query, cancellationToken);
@@ -81,16 +91,94 @@ public abstract class DynamicQueryHandlerBase<TSource, TDestination>
 
     protected virtual IQueryCriteria CreateCriteriaFromQuery(IDynamicQuery query)
     {
+        var filters = query?.GetFilters() ?? new List<IFilter>();
+        ConvertFilterValuesToPropertyTypes(filters);
         var criteria = new QueryCriteria
         {
             Page = query?.GetPage(),
             PageSize = query?.GetPageSize(),
-            Filters = query?.GetFilters() ?? new List<IFilter>(),
+            Filters = filters,
             Sorts = query?.GetSorts() ?? new List<ISort>(),
             Groups = query?.GetGroups() ?? new List<IGroup>(),
             Aggregates = query?.GetAggregates() ?? new List<IAggregate>()
         };
         return criteria;
     }
+
+    /// <summary>
+    /// Converts string filter values to the correct CLR type based on TSource property types.
+    /// This handles the case where transport layers (e.g. gRPC) pass all values as strings,
+    /// but PoweredSoft.DynamicLinq needs the actual type to build LINQ expressions.
+    /// </summary>
+    [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2087",
+        Justification = "TSource properties are preserved by EF Core and DynamicLinq usage")]
+    private static void ConvertFilterValuesToPropertyTypes(List<IFilter> filters)
+    {
+        for (var i = filters.Count - 1; i >= 0; i--)
+        {
+            var filter = filters[i];
+            if (filter is SimpleFilter simpleFilter)
+            {
+                if (simpleFilter.Value == null)
+                {
+                    filters.RemoveAt(i);
+                    continue;
+                }
+
+                if (simpleFilter.Value is string strValue && !string.IsNullOrEmpty(strValue))
+                {
+                    var propertyType = ResolvePropertyType(typeof(TSource), simpleFilter.Path);
+                    if (propertyType == null)
+                        continue;
+
+                    var targetType = Nullable.GetUnderlyingType(propertyType) ?? propertyType;
+
+                    if (targetType == typeof(DateTime))
+                    {
+                        if (DateTime.TryParse(strValue, CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal,
+                                out var dt))
+                        {
+                            simpleFilter.Value = DateTime.SpecifyKind(dt, DateTimeKind.Utc);
+                        }
+                    }
+                    else if (targetType == typeof(DateTimeOffset))
+                    {
+                        if (DateTimeOffset.TryParse(strValue, CultureInfo.InvariantCulture, DateTimeStyles.None,
+                                out var dto))
+                        {
+                            simpleFilter.Value = dto;
+                        }
+                    }
+                }
+            }
+            else if (filter is CompositeFilter compositeFilter && compositeFilter.Filters != null)
+            {
+                ConvertFilterValuesToPropertyTypes(compositeFilter.Filters);
+            }
+        }
+
+        [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2070",
+            Justification = "Property types are preserved by EF Core and DynamicLinq usage")]
+        [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2075",
+            Justification = "Nested property type resolution is inherently dynamic")]
+        static Type? ResolvePropertyType(
+            [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicProperties)] Type type, string? path)
+        {
+            if (string.IsNullOrEmpty(path))
+                return null;
+
+            var currentType = type;
+            foreach (var part in path.Split('.'))
+            {
+                var property = currentType.GetProperty(part,
+                    BindingFlags.Public | BindingFlags.Instance | BindingFlags.IgnoreCase);
+                if (property == null)
+                    return null;
+                currentType = property.PropertyType;
+            }
+
+            return currentType;
+        }
+    }
 }
 

Svrnty.CQRS.Grpc.Generators/ProtoFileGenerator.cs

@@ -413,17 +413,21 @@ internal class ProtoFileGenerator
 
     private void GenerateComplexTypeMessage(INamedTypeSymbol? type)
     {
-        if (type == null || _generatedMessages.Contains(type.Name))
+        if (type == null)
+            return;
+
+        var messageName = ProtoFileTypeMapper.GetProtoMessageName(type);
+        if (_generatedMessages.Contains(messageName))
             return;
 
         // Don't generate messages for system types or primitives
         if (type.ContainingNamespace?.ToString().StartsWith("System") == true)
             return;
 
-        _generatedMessages.Add(type.Name);
+        _generatedMessages.Add(messageName);
 
-        _messagesBuilder.AppendLine($"// {type.Name} entity");
-        _messagesBuilder.AppendLine($"message {type.Name} {{");
+        _messagesBuilder.AppendLine($"// {messageName} entity");
+        _messagesBuilder.AppendLine($"message {messageName} {{");
 
         // Collect nested complex types to generate after closing this message
         var nestedComplexTypes = new List<INamedTypeSymbol>();

Svrnty.CQRS.Grpc.Generators/ProtoTypeMapper.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Linq;
 using Microsoft.CodeAnalysis;
 
 namespace Svrnty.CQRS.Grpc.Generators;
@@ -151,13 +152,27 @@ internal static class ProtoFileTypeMapper
         // Complex types (classes/records) become message types
         if (typeSymbol.TypeKind == TypeKind.Class || typeSymbol.TypeKind == TypeKind.Struct)
         {
-            return typeName; // Reference the message type by name
+            return GetProtoMessageName(typeSymbol); // Reference the message type by name (handles generics)
         }
 
         // Fallback
         return "string"; // Default to string for unknown types
     }
 
+    /// <summary>
+    /// Gets the proto message name for a type, handling generic types by qualifying
+    /// with type arguments. e.g. Translation&lt;FaqTranslationQueryItem&gt; becomes TranslationOfFaqTranslationQueryItem.
+    /// </summary>
+    public static string GetProtoMessageName(ITypeSymbol typeSymbol)
+    {
+        if (typeSymbol is INamedTypeSymbol namedType && namedType.IsGenericType && namedType.TypeArguments.Length > 0)
+        {
+            var typeArgs = string.Join("And", namedType.TypeArguments.Select(t => GetProtoMessageName(t)));
+            return $"{namedType.Name}Of{typeArgs}";
+        }
+        return typeSymbol.Name;
+    }
+
     /// <summary>
     /// Converts C# PascalCase property name to proto snake_case field name.
     /// Uses simple conversion: add underscore before each uppercase letter (except first).