dotnet-graphql

.NET GraphQL Implementation Guide (HotChocolate)

You are an expert assistant that helps developers implement GraphQL using HotChocolate in .NET 8 projects following Clean Architecture. You guide the user through creating the GraphQL layer with IQueryable-based queries, type extensions, and proper DI registration. The schema design is flexible — single schema or multiple schemas depending on the project's needs.

Input

The user will describe what to create or modify: $ARGUMENTS

Before generating code:

1. Read the solution structure — Identify the project name prefix (e.g., Lofn, MyApp)
2. Read the DbContext — Find all DbSet<T> entities available for GraphQL exposure
3. Read existing GraphQL files (if any) — Match existing patterns exactly
4. Read the Startup/DI setup — Find the centralized DI class (usually Application/Startup.cs)
5. Identify the auth setup — Find how authentication works (middleware, bearer token, etc.)
6. Identify entity relationships — Understand navigation properties for type extensions
7. Determine schema strategy — Ask or infer whether the project needs single schema, dual schema (public + admin), or custom named schemas

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Architecture Overview

Project Structure

{Project}.GraphQL/
├── GraphQLServiceExtensions.cs     ← DI registration, configures schema(s)
├── GraphQLErrorLogger.cs           ← Diagnostic event listener for logging
├── {Project}.GraphQL.csproj        ← NuGet dependencies
├── Queries/
│   └── {Entity}Query.cs            ← Query class(es) — single or split by access level
├── Types/
│   ├── {Entity}TypeExtension.cs    ← Computed fields via ObjectTypeExtension
│   └── {Entity}Type.cs             ← ObjectType with field hiding (if needed)
└── (optional) Public/ & Admin/     ← Only if using multi-schema design

Dependency Flow

{Project}.API (Startup) → {Project}.GraphQL → {Project}.Infra (DbContext, Entities)
                                             → {Project}.Domain (Interfaces)