Phase 1: Replace GenericServices with Custom Services, MediatR, and FluentValidation#11
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…ntValidation Phase 1 implementation to replace GenericServices with modern .NET Core-compatible architecture: - Create SampleWebApp.Core .NET Standard 2.0 project - Add NuGet packages: MediatR 9.0.0, AutoMapper 10.1.1, FluentValidation 10.4.0 - Implement base classes (BaseDto, BaseQuery, BaseCommand) - Implement result types (CreateResult, UpdateResult, DeleteResult, PagedResult, SuccessOrErrors) - Create DTOs (PostDto, SimplePostDto, TagDto, BlogDto) - Create generic service interfaces (IListService, IDetailService, ICreateService, IUpdateService, IDeleteService) - Create domain-specific service interfaces (IPostService, ITagService, IBlogService) - Implement MediatR queries and commands for Posts, Tags, and Blogs - Implement MediatR handlers for all queries and commands - Implement service classes (PostService, TagService, BlogService) using IDbContextAdapter pattern - Implement FluentValidation validators (PostValidator, TagValidator, BlogValidator) - Create AutoMapper profiles for entity-to-DTO mapping - Create anti-corruption layer (GenericServicesAdapter) - Configure dependency injection (ServiceCollectionExtensions) Co-Authored-By: Abhay Aggarwal <abhay.aggarwal@codeium.com>
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Phase 1: Replace GenericServices with Custom Services, MediatR, and FluentValidation
Summary
This PR implements Phase 1 of the migration plan to replace GenericServices (v1.0.9, not .NET Core compatible) with a modern architecture. A new
SampleWebApp.Core.NET Standard 2.0 project has been created containing:Package versions were adjusted for .NET Standard 2.0 compatibility: MediatR 9.0.0, AutoMapper 10.1.1, FluentValidation 10.4.0.
Review & Testing Checklist for Human
IDbContextAdapter pattern review: Services depend on
IDbContextAdapterinterface with entity types (PostEntity, TagEntity, BlogEntity) defined in the Core project. No implementation exists yet - this is intentional to avoid DataLayer coupling. Verify this approach is acceptable for Phase 2 integration.DTO structure validation: DTOs have both
Id(from BaseDto) and entity-specific IDs (PostId, TagId, BlogId). Confirm this dual-ID pattern won't cause issues when mapping to/from existing ServiceLayer DTOs.Validator logic review: PostValidator includes business rules (no "!" in title, no "sheep/lamb/cow/calf" in content) copied from existing code. Verify these match current validation requirements.
GenericServicesAdapter completeness: Currently only implements Post operations. Confirm whether Tag/Blog adapter methods are needed for Phase 1.
Build verification: Run
dotnet build SampleWebApp.Core/SampleWebApp.Core.csprojto confirm compilation succeeds.Recommended test plan: Since this is Phase 1 (infrastructure only), functional testing requires Phase 2 implementation. For now, verify the project builds and review the code structure matches the specification document.
Notes
Link to Devin run: https://app.devin.ai/sessions/7a2a40985384430e85b04122e904bb90
Requested by: Abhay Aggarwal (abhay.aggarwal@cognition.ai) / @abhay-codeium