Update ALl the new era!

Why you need to define the QueryHandler?
Is this be a muse? I'm so happy.
The version should be a major!

src/OfX.EntityFrameworkCore/ApplicationModels/OfXEfCoreRegistrar.cs

@@ -0,0 +1,15 @@
+using System.Reflection;
+
+namespace OfX.EntityFrameworkCore.ApplicationModels;
+
+public sealed class OfXEfCoreRegistrar
+{
+    public List<Type> DbContextTypes { get; private set; } = [];
+    public Assembly ModelConfigurationAssembly { get; private set; }
+
+    public void AddDbContexts(Type dbContext, params Type[] otherDbContextTypes) =>
+        DbContextTypes = [dbContext, ..otherDbContextTypes ?? []];
+
+    public void AddModelConfigurationsFromNamespaceContaining<TAssembly>() =>
+        ModelConfigurationAssembly = typeof(TAssembly).Assembly;
+}

src/OfX.EntityFrameworkCore/EfQueryOfXHandler.cs → src/OfX.EntityFrameworkCore/EfQueryOfHandler.cs

@@ -5,73 +5,57 @@
 using Newtonsoft.Json;
 using OfX.Abstractions;
 using OfX.Attributes;
-using OfX.EntityFrameworkCore.ApplicationModels;
 using OfX.EntityFrameworkCore.Delegates;
-using OfX.Helpers;
 using OfX.Responses;
 
 namespace OfX.EntityFrameworkCore;
 
-public abstract class EfQueryOfXHandler<TModel, TAttribute> : IQueryOfHandler<TModel, TAttribute>
+public class EfQueryOfHandler<TModel, TAttribute>(
+    IServiceProvider serviceProvider,
+    string idPropertyName,
+    string defaultPropertyName)
+    : IQueryOfHandler<TModel, TAttribute>
     where TModel : class
     where TAttribute : OfXAttribute
 {
-    private readonly string _idAlias;
+    private static readonly Lazy<ConcurrentDictionary<string, Expression<Func<TModel, OfXDataResponse>>>>
+        ExpressionMapModelStorage = new(() => []);
 
-    private const string DefaultIdAlias = "Id";
-
-    private readonly Func<RequestOf<TAttribute>, Expression<Func<TModel, bool>>> _filterFunction;
-    private readonly Expression<Func<TModel, OfXDataResponse>> _howToGetDefaultData;
-    private readonly DbSet<TModel> _collection;
-
-    /// <summary>
-    /// Note that the Id will automatically be selected. To modify this one, please update this method either
-    /// </summary>
-    protected virtual string SetIdAlias() => DefaultIdAlias;
-
-    private static readonly Lazy<ConcurrentDictionary<QueryExpressionData, Expression<Func<TModel, OfXDataResponse>>>>
-        LazyStorage = new(() => []);
-
-    protected EfQueryOfXHandler(IServiceProvider serviceProvider)
-    {
-        _filterFunction = SetFilter();
-        _howToGetDefaultData = SetHowToGetDefaultData();
-        ExceptionHelpers.ThrowIfNull(_filterFunction);
-        ExceptionHelpers.ThrowIfNull(_howToGetDefaultData);
-        _idAlias = SetIdAlias();
-        _collection = serviceProvider.GetRequiredService<GetEfDbContext>().Invoke(typeof(TModel))
-            .GetCollection<TModel>();
-    }
-
-    protected abstract Func<RequestOf<TAttribute>, Expression<Func<TModel, bool>>> SetFilter();
-
-    protected abstract Expression<Func<TModel, OfXDataResponse>> SetHowToGetDefaultData();
-
-    protected virtual Task HandleContextAsync(RequestContext<TAttribute> context) => Task.CompletedTask;
+    private readonly DbSet<TModel> _collection = serviceProvider.GetRequiredService<GetEfDbContext>()
+        .Invoke(typeof(TModel)).GetCollection<TModel>();
 
     public async Task<ItemsResponse<OfXDataResponse>> GetDataAsync(RequestContext<TAttribute> context)
     {
-        await HandleContextAsync(context);
-        var filter = _filterFunction.Invoke(context.Query);
+        var query = context.Query.Expression is null
+            ? context.Query with { Expression = defaultPropertyName }
+            : context.Query;
         var data = await _collection
             .AsNoTracking()
-            .Where(filter)
-            .Select(BuildResponse(context.Query))
+            .Where(BuildFilter(context.Query))
+            .Select(BuildResponse(query))
             .ToListAsync(context.CancellationToken);
         return new ItemsResponse<OfXDataResponse>(data);
     }
 
-    private Expression<Func<TModel, OfXDataResponse>> BuildResponse(RequestOf<TAttribute> request)
+    // Todo: This is very first version, which is support for string. I need to define for specific type. This will be update later one!
+    private Expression<Func<TModel, bool>> BuildFilter(RequestOf<TAttribute> query)
     {
-        if (string.IsNullOrWhiteSpace(request.Expression)) return _howToGetDefaultData;
+        var parameter = Expression.Parameter(typeof(TModel), "x");
+        var property = Expression.Property(parameter, idPropertyName);
+        var selectorsConstant = Expression.Constant(query.SelectorIds);
+        var containsMethod = typeof(List<string>).GetMethod("Contains", [typeof(string)]);
+        var containsCall = Expression.Call(selectorsConstant, containsMethod!, property);
+        return Expression.Lambda<Func<TModel, bool>>(containsCall, parameter);
+    }
 
-        return LazyStorage.Value.GetOrAdd(new QueryExpressionData(request.Expression, typeof(TModel)), expressionData =>
+    private Expression<Func<TModel, OfXDataResponse>> BuildResponse(RequestOf<TAttribute> request)
+    {
+        return ExpressionMapModelStorage.Value.GetOrAdd(request.Expression, expression =>
         {
-            var expression = expressionData.Expression;
             var parameter = Expression.Parameter(typeof(TModel), "x");
 
             // Access the Id property on the model
-            var idProperty = Expression.Property(parameter, _idAlias);
+            var idProperty = Expression.Property(parameter, idPropertyName);
             var toStringMethod = typeof(object).GetMethod(nameof(ToString), Type.EmptyTypes);
             var idAsString = Expression.Call(idProperty, toStringMethod!);
 

src/OfX.EntityFrameworkCore/Exceptions/OfXEntityFrameworkException.cs

@@ -6,4 +6,7 @@ public class EntityFrameworkDbContextNotRegister(string message) : Exception(mes
 
     public class ThereAreNoDbContextHasModel(Type modelType)
         : Exception($"There are no any db context contains model: {modelType.Name}");
+
+    public class DbContextsMustNotBeEmpty()
+        : Exception($"There are no any db contexts on AddOfXEFCore() method");
 }

src/OfX.EntityFrameworkCore/Extensions/EntityFrameworkExtensions.cs

@@ -1,35 +1,47 @@
 using System.Collections.Concurrent;
+using System.Reflection;
+using System.Reflection.Emit;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.DependencyInjection.Extensions;
 using OfX.Abstractions;
+using OfX.Attributes;
 using OfX.EntityFrameworkCore.Abstractions;
+using OfX.EntityFrameworkCore.ApplicationModels;
 using OfX.EntityFrameworkCore.Delegates;
 using OfX.EntityFrameworkCore.Exceptions;
 using OfX.EntityFrameworkCore.Services;
-using OfX.Exceptions;
 using OfX.Extensions;
 using OfX.Registries;
-using OfX.Statics;
 
 namespace OfX.EntityFrameworkCore.Extensions;
 
 public static class EntityFrameworkExtensions
 {
     private static readonly Lazy<ConcurrentDictionary<Type, Type>> modelTypeLookUp = new(() => []);
+    private static readonly Type baseGenericType = typeof(EfQueryOfHandler<,>);
+    private static readonly Type interfaceGenericType = typeof(IQueryOfHandler<,>);
 
-    public static OfXServiceInjector AddOfXEFCore<TDbContext>(
-        this OfXServiceInjector ofXServiceInjector) where TDbContext : DbContext
+    public static OfXServiceInjector AddOfXEFCore(this OfXServiceInjector ofXServiceInjector,
+        Action<OfXEfCoreRegistrar> registrarAction)
     {
+        var newOfXEfCoreRegistrar = new OfXEfCoreRegistrar();
+        registrarAction.Invoke(newOfXEfCoreRegistrar);
+        var dbContextTypes = newOfXEfCoreRegistrar.DbContextTypes;
+        if (dbContextTypes.Count == 0)
+            throw new OfXEntityFrameworkException.DbContextsMustNotBeEmpty();
         var serviceCollection = ofXServiceInjector.OfXRegister.ServiceCollection;
-        serviceCollection.AddScoped<IOfXEfDbContext>(sp =>
+        dbContextTypes.ForEach(dbContextType =>
         {
-            var dbContext = sp.GetService<TDbContext>();
-            if (dbContext is null)
-                throw new OfXEntityFrameworkException.EntityFrameworkDbContextNotRegister(
-                    "DbContext must be registered first!");
-            return new EfDbContextWrapped<TDbContext>(dbContext);
+            serviceCollection.AddScoped(sp =>
+            {
+                if (sp.GetService(dbContextType) is not DbContext dbContext)
+                    throw new OfXEntityFrameworkException.EntityFrameworkDbContextNotRegister(
+                        "DbContext must be registered first!");
+                return (IOfXEfDbContext)Activator.CreateInstance(
+                    typeof(EfDbContextWrapped<>).MakeGenericType(dbContextType), dbContext);
+            });
         });
+
         serviceCollection.AddScoped<GetEfDbContext>(sp => modelType =>
         {
             if (modelTypeLookUp.Value.TryGetValue(modelType, out var serviceType))
@@ -41,29 +53,61 @@ public static OfXServiceInjector AddOfXEFCore<TDbContext>(
             modelTypeLookUp.Value.TryAdd(modelType, matchingServiceType.GetType());
             return matchingServiceType;
         });
-        AddEfQueryOfXHandlers(ofXServiceInjector);
+        AddEfQueryOfXHandlers(ofXServiceInjector, newOfXEfCoreRegistrar);
         return ofXServiceInjector;
     }
 
-    private static void AddEfQueryOfXHandlers(OfXServiceInjector serviceInjector)
+    private static void AddEfQueryOfXHandlers(OfXServiceInjector serviceInjector, OfXEfCoreRegistrar ofXEfCoreRegistrar)
     {
-        if (serviceInjector.OfXRegister.HandlersRegister is null) return;
-        var baseType = typeof(EfQueryOfXHandler<,>);
-        var interfaceType = typeof(IQueryOfHandler<,>);
-        serviceInjector.OfXRegister.HandlersRegister.ExportedTypes
-            .Where(t =>
+        var modelsHasOfXConfig = ofXEfCoreRegistrar.ModelConfigurationAssembly
+            .ExportedTypes
+            .Where(a => a is { IsClass: true, IsAbstract: false, IsInterface: false })
+            .Where(a => a.GetCustomAttributes().Any(x =>
             {
-                var basedType = t.BaseType;
-                if (basedType is null || !basedType.IsGenericType) return false;
-                return t is { IsClass: true, IsAbstract: false } && basedType.GetGenericTypeDefinition() == baseType;
-            })
-            .ForEach(handlerType =>
+                var attributeType = x.GetType();
+                return attributeType.IsGenericType &&
+                       attributeType.GetGenericTypeDefinition() == typeof(OfXConfigForAttribute<>);
+            })).Select(a =>
             {
-                var args = handlerType.BaseType!.GetGenericArguments();
-                var parentType = interfaceType.MakeGenericType(args);
-                if (!OfXStatics.InternalQueryMapHandler.TryAdd(args[1], parentType))
-                    throw new OfXException.RequestMustNotBeAddMoreThanOneTimes();
-                serviceInjector.OfXRegister.ServiceCollection.TryAddScoped(parentType, handlerType);
+                var attributes = a.GetCustomAttributes();
+                var configAttribute = attributes.Select(x =>
+                {
+                    var attributeType = x.GetType();
+                    if (!attributeType.IsGenericType) return (null, null);
+                    if (attributeType.GetGenericTypeDefinition() != typeof(OfXConfigForAttribute<>))
+                        return (null, null);
+                    return (OfXConfigAttribute: x, OfXAttribute: attributeType.GetGenericArguments()[0]);
+                }).First(x => x is { OfXConfigAttribute: not null, OfXAttribute: not null });
+                return (ModelType: a, OfXAttributeData: configAttribute.OfXConfigAttribute as IOfXConfigAttribute,
+                    configAttribute.OfXAttribute);
             });
+
+        modelsHasOfXConfig.ForEach(m =>
+        {
+            var assemblyName = new AssemblyName("EfQueryOfHandlerModule");
+            var assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
+            var moduleBuilder = assemblyBuilder.DefineDynamicModule("EfQueryOfHandlerModule");
+
+            var baseType = baseGenericType.MakeGenericType(m.ModelType, m.OfXAttribute);
+            var typeBuilder = moduleBuilder.DefineType($"{m.ModelType.Name}EfQueryOfHandler",
+                TypeAttributes.NotPublic | TypeAttributes.Sealed | TypeAttributes.Class, baseType);
+
+            // Define the constructor
+            var baseCtor = baseType.GetConstructor([typeof(IServiceProvider), typeof(string), typeof(string)])!;
+            var ctorBuilder = typeBuilder.DefineConstructor(MethodAttributes.Public, CallingConventions.Standard,
+                [typeof(IServiceProvider)]);
+            var ctorIL = ctorBuilder.GetILGenerator();
+            ctorIL.Emit(OpCodes.Ldarg_0); // Load "this"
+            ctorIL.Emit(OpCodes.Ldarg_1); // Load IServiceProvider argument
+            ctorIL.Emit(OpCodes.Ldstr, m.OfXAttributeData.IdProperty); // Load "IdProperty" string argument
+            ctorIL.Emit(OpCodes.Ldstr, m.OfXAttributeData.DefaultProperty); // Load "DefaultProperty" string argument
+            ctorIL.Emit(OpCodes.Call, baseCtor); // Call the base constructor
+            ctorIL.Emit(OpCodes.Ret);
+
+            // Create the dynamic type
+            var dynamicType = typeBuilder.CreateType();
+            serviceInjector.OfXRegister.ServiceCollection.AddScoped(
+                interfaceGenericType.MakeGenericType(m.ModelType, m.OfXAttribute), dynamicType);
+        });
     }
 }

src/OfX.EntityFrameworkCore/OfX.EntityFrameworkCore.csproj

@@ -4,7 +4,7 @@
         <ImplicitUsings>enable</ImplicitUsings>
         <TargetFrameworks>net9.0;net8.0</TargetFrameworks>
         <LangVersion>default</LangVersion>
-        <Version>2.0.4</Version>
+        <Version>3.0.0</Version>
         <Authors>Quy Vu</Authors>
         <PackageId>OfX-EFCore</PackageId>
         <Description>OfX extension. Use EntityFramework as Data Querying</Description>

src/OfX.EntityFrameworkCore/README.md

@@ -42,51 +42,30 @@ builder.Services.AddOfXEntityFrameworkCore(cfg =>
     cfg.AddAttributesContainNamespaces(typeof(WhereTheAttributeDefined).Assembly);
     cfg.AddHandlersFromNamespaceContaining<SomeHandlerAssemblyMarker>();
 })
-.AddOfXEFCore<ServiceDbContext>();
-```
-
-After installing the package OfX-EFCore, you can use the extension method `RegisterOfXEntityFramework()`, which takes two arguments: the `DbContext` and the handlers assembly.
-
-### 2. Write a Handler Using EF Core
-
-Implement a request handler to fetch the required data using Entity Framework Core. For example:
-
-```csharp
-public sealed class UserOfXHandler(IServiceProvider serviceProvider)
-    : EfQueryOfXHandler<User, UserOfAttribute>(serviceProvider)
+.AddOfXEFCore(options =>
 {
-    protected override Func<RequestOf<UserOfAttribute>, Expression<Func<User, bool>>> SetFilter() =>
-        q => u => q.SelectorIds.Contains(u.Id);
-
-    protected override Expression<Func<User, OfXDataResponse>> SetHowToGetDefaultData() =>
-        u => new OfXDataResponse { Id = u.Id, Value = u.Name };
-}
+    options.AddDbContexts(typeof(TestDbContext));
+    options.AddModelConfigurationsFromNamespaceContaining<SomeModelAssemblyMarker>();
+});
 ```
 
-### Function Details
-
-#### `SetFilter`
-This function is used to define the filter for querying data. It takes the query (`GetUserOfXQuery`) as an argument and returns an `Expression<Func<TModel, bool>>`, where `TModel` is your EF Core entity.
+After installing the package OfX-EFCore, you can use the method `AddDbContexts()`, which takes `DbContext(s)` to executing.
 
+### 2. Mark the model you want to use with OfXAttribute
 Example:
-```csharp
-protected override Func<RequestOf<UserOfAttribute>, Expression<Func<User, bool>>> SetFilter() =>
-    q => u => q.SelectorIds.Contains(u.Id);
-```
-Here, `SetFilter` ensures that only entities matching the provided `SelectorIds` in the query are retrieved.
-
-#### `SetHowToGetDefaultData`
-This function specifies how to map the retrieved entity to the default data format. It returns an `Expression<Func<TModel, OfXDataResponse>>`, where `TModel` is your EF Core entity and `OfXDataResponse` is the mapped data structure.
 
-Example:
 ```csharp
-protected override Expression<Func<User, OfXDataResponse>> SetHowToGetDefaultData() =>
-    u => new OfXDataResponse { Id = u.Id, Value = u.Name };
+[OfXConfigFor<UserOfAttribute>(nameof(Id), nameof(Name))]
+public class User
+{
+    public string Id { get; set; }
+    public string Name { get; set; }
+    public string Email { get; set; }
+}
 ```
-Here, `SetHowToGetDefaultData` maps the `Id` and `Name` of the `User` entity to the `OfXDataResponse` format.
-
-By overriding these functions, you can customize the filtering logic and data mapping behavior to suit your application's requirements.
+That all! Let go to the moon!
 
+Note: In this release, Id is exclusively supported as a string. But hold tight—I'm gearing up to blow your mind with the next update! Stay tuned!
 
 | Package Name                                             | Description                                                                                     | .NET Version | Document                                                                  |
 |----------------------------------------------------------|-------------------------------------------------------------------------------------------------|--------------|---------------------------------------------------------------------------|

src/OfX.Grpc/OfX.Grpc.csproj

@@ -4,7 +4,7 @@
         <ImplicitUsings>enable</ImplicitUsings>
         <TargetFrameworks>net9.0;net8.0</TargetFrameworks>
         <LangVersion>default</LangVersion>
-        <Version>2.0.3</Version>
+        <Version>3.0.0</Version>
         <Authors>Quy Vu</Authors>
         <PackageId>OfX-gRPC</PackageId>
         <Description>OfX extension. Use gRPC as Data transporting</Description>

src/OfX.Tests/Models/User.cs

@@ -1,5 +1,9 @@
+using OfX.Attributes;
+using OfX.Tests.Attributes;
+
 namespace OfX.Tests.Models;
 
+[OfXConfigFor<UserOfAttribute>(nameof(Id), nameof(Name))]
 public class User
 {
     public string Id { get; set; }