add-module

# Add Module High-ceremony. The part people get wrong is **registration — a module must be wired in FOUR places** (see Step 6). Architecture rules: `.agents/rules/architecture.md`. ## Projects ``` src/Modules/{Name}/ ├── Modules.{Name}/ ← runtime (internal): Domain/, Data/, Features/v1/, {Name}Module.cs └── Modules.{Name}.Contracts/ ← public API: v1/ (commands/queries), Dtos/, Authorization/, Events/ ``` **Copy an existing module's two `.csproj` files** (e.g. `Modules.Catalog`) and rename — don't hand-write project references. The runtime project references its Contracts project + the BuildingBlocks it needs; the Contracts project references `Mediator` + shared contracts. ## Step 1 — `[FshModule]` is an ASSEMBLY attribute (not class-level) In `{Name}Module.cs`, above the namespace: ```csharp [assembly: FshModule(typeof(FSH.Modules.{Name}.{Name}Module), 900)] // (Type, order) namespace FSH.Modules.{Name}; public sealed class {Name}Module : IModule { public void ConfigureServices(IHostApplicationBuilder builder) { ArgumentNullException.ThrowIfNull(builder); PermissionConstants.Register({Name}Permissions.All); builder.Services.AddHeroDbContext<{Name}DbContext>(); builder.Services.AddScoped<IDbInitializer, {Name}DbInitializer>(); // Only if the module HANDLES integration events: // builder.Services.AddIntegrationEventHandlers(typeof({Name}Module).Assembly); // // Publishing needs no registration at all — the outbox is framework-owned // (host calls AddEventingCore once). Inject IOutboxWriter and publish. // Never register a per-module outbox store; see .agents/rules/eventing.md. builder.Services.AddHealthChecks() .AddDbContextCheck<{Name}DbContext>(name: "db:{name}"); } public void ConfigureMiddleware(IApplicationBuilder app) { } // optional, runs after auth public void MapEndpoints(IEndpointRouteBuilder endpoints) { ArgumentNullException.ThrowIfNull(endpoints); var versionSet = endpoints.NewApiVersionSet().HasApiVersion(new ApiVersion(1)).ReportApiVersions().Build(); var group = endpoints.MapGroup("api/v{version:apiVersion}/{name}") .WithTags("{Name}").WithApiVersionSet(versionSet).RequireAuthorization(); // group.MapCreate{Entity}Endpoint(); … } } ``` `Order` controls load sequence (Auditing 300, Files 350, Webhooks 400, Billing 500, Catalog 600, Tickets 700, Notifications 750, Chat 800). If your module consumes another's events, load after it. ## Step 2 — Permissions (Contracts/Authorization) `{Name}Permissions` with nested resource classes and an `All` collection registered via `PermissionConstants.Register({Name}Permissions.All)`. Mirror the shape of `CatalogPermissions`. ## Step 3 — DbContext (extends `BaseDbContext`) ```csharp public sealed class {Name}DbContext : BaseDbContext { public const string Schema = "{name}"; public {Name}DbContext( IMultiTenantContextAccessor<AppTenantInfo> multiTenantContextAccessor, DbContextOptions<{Name}DbContext> options, IOptions<DatabaseOptions> settings, IHostEnvironment environment) : base(multiTenantContextAccessor, options, settings, environment) { } public DbSet<{Entity}> {Entities} => Set<{Entity}>(); protected override void OnModelCreating(ModelBuilder modelBuilder) { ArgumentNullException.ThrowIfNull(modelBuilder); modelBuilder.HasDefaultSchema(Schema); modelBuilder.ApplyConfigurationsFromAssembly(typeof({Name}DbContext).Assembly); base.OnModelCreating(modelBuilder); // MUST be last — applies tenant + soft-delete filters } } ``` ## Step 4 — Solution + project references ```bash dotnet sln src/FSH.Starter.slnx add src/Modules/{Name}/Modules.{Name}/Modules.{Name}.csproj dotnet sln src/FSH.Starter.slnx add src/Modules/{Name}/Modules.{Name}.Contracts/Modules.{Name}.Contracts.csproj ``` Add a `<ProjectReference>` to the runtime module from **both** `FSH.Starter.Api` and `FSH.Starter.DbMigrator`, and reference the runtime project from `FSH.Starter.Migrations.PostgreSQL`. ## Step 5 — Migrations folder Add a `{Name}/` folder in `src/Host/FSH.Starter.Migrations.PostgreSQL`, then create the initial migration (see **create-migration**) with `--context {Name}DbContext`. ## Step 6 — ⚠️ Register in ALL FOUR places (the footgun) Identical edits in **both** `FSH.Starter.Api/Program.cs` **and** `FSH.Starter.DbMigrator/Program.cs`: 1. Mediator `o.Assemblies` — add **two** markers: a Contracts type (e.g. `typeof(FSH.Modules.{Name}.Contracts.{Name}ContractsMarker)`) **and** the module type (`typeof({Name}Module)`). 2. `moduleAssemblies` array — add `typeof({Name}Module).Assembly`. Miss the Mediator marker → handlers silently undiscovered. Miss the assembly entry → module never loads. Miss the DbMigrator pair → migrate/seed skips the module. ## Step 7 — Verify ```bash dotnet build src/FSH.Starter.slnx # 0 warnings dotnet test src/Tests/Architecture.Tests # boundary + tenant-isolation rules must pass dotnet test src/FSH.Starter.slnx ``` ## Checklist - [ ] Two projects (copied csproj), added to `.slnx`, referenced from Api + DbMigrator (+ Migrations) - [ ] `[assembly: FshModule(typeof({Name}Module), order)]` (assembly-level, positional) - [ ] `IModule`: `AddHeroDbContext<T>()`, `PermissionConstants.Register`, version-set group, eventing trio if needed - [ ] `{Name}DbContext : BaseDbContext`, 4-arg ctor, `base.OnModelCreating` last - [ ] `{Name}Permissions` in Contracts/Authorization - [ ] Migrations folder + initial migration (`--context {Name}DbContext`) - [ ] **Registered in all four places** (Api + DbMigrator × Mediator + moduleAssemblies) - [ ] Build + Architecture.Tests green