rich-domain

@woltz/rich-domain-drizzle

Drizzle ORM adapter for @woltz/rich-domain. Provides plug and play integration between rich-domain and Drizzle ORM.

Installation

npm install @woltz/rich-domain @woltz/rich-domain-drizzle drizzle-orm

Features

• ✅ Unit of Work with AsyncLocalStorage (request isolation)
• ✅ DrizzleRepository base class with Criteria support
• ✅ DrizzleToPersistence base class with change tracking
• ✅ @Transactional decorator for automatic transactions
• ✅ DrizzleBatchExecutor for batch change operations
• ✅ EntitySchemaRegistry for owned (1:N) and reference (N:N) collections
• ✅ Junction table support for explicit N:N mappings

Quick Start

1. Setup

import { drizzle } from "drizzle-orm/node-postgres";
import * as schema from "./schema";
import { DrizzleUnitOfWork } from "@woltz/rich-domain-drizzle";

type DB = ReturnType<typeof drizzle<typeof schema>>;

const db: DB = drizzle(pool, { schema });
const uow = new DrizzleUnitOfWork(db);

2. Create Repository

import { DrizzleRepository, SearchableField } from "@woltz/rich-domain-drizzle";
import { users } from "./schema";

type DB = ReturnType<typeof drizzle<typeof schema>>;

class UserRepository extends DrizzleRepository<User, UserRecord, DB> {
  constructor(db: DB, uow: DrizzleUnitOfWork) {
    super({
      db,
      table: users,
      toDomainMapper: new UserToDomainMapper(),
      toPersistenceMapper: new UserToPersistenceMapper(db, uow),
      uow,
    });
  }

  protected get model() {
    return "users"; // key in db.query — matches Drizzle schema export name
  }

  protected getSearchableFields(): SearchableField<UserRecord>[] {
    return ["name", "email"];
  }

  protected getDefaultRelations() {
    return { posts: { with: { tags: { with: { tag: true } } } } };
  }
}

3. Use It

const userRepo = new UserRepository(uow);

// Create
const user = User.create({
  name: "John",
  email: "john@example.com",
  posts: [],
});
await userRepo.save(user);

// Find by ID
const found = await userRepo.findById(user.id.value);

// Find with Criteria
const criteria = Criteria.create<User>()
  .whereEquals("name", "John")
  .orderByAsc("createdAt")
  .paginate(1, 10);

const result = await userRepo.find(criteria);
// result.data → User[]
// result.toJSON().meta.total → total count

// Update (automatic change tracking)
found.updateName("John Updated");
await userRepo.save(found); // Detects and applies only what changed

// Delete
await userRepo.delete(found);
await userRepo.deleteById(userId);

---

API Reference

DrizzleUnitOfWork

Manages transactions with per-request isolation using AsyncLocalStorage.

const uow = new DrizzleUnitOfWork(db);

// Execute in transaction
await uow.transaction(async () => {
  await userRepo.save(user);
  await postRepo.save(post);
  // All or nothing — rolls back on failure
});

// Check if in transaction
uow.isInTransaction(); // boolean

// Get current context
uow.getCurrentContext(); // DrizzleTransactionContext | null

---

DrizzleRepository

Base class for repositories with full Criteria support.

abstract class DrizzleRepository<
  TDomain,
  TRecord,
  TDb extends DrizzleClient = DrizzleClient,
> {
  constructor(config: { db: TDb; table: any; toDomainMapper; toPersistenceMapper; uow }) { ... }

  // Required: key in db.query matching the Drizzle schema export name
  protected abstract get model(): string;

  // Optional: searchable columns for Criteria "search" operator
  protected getSearchableFields(): SearchableField<TRecord>[];

  // Optional: default relations to include in queries
  protected getDefaultRelations(): Record<string, any>;

  // Available: current context (transaction or plain db) — typed as TDb
  protected get context(): TDb;

  // Available methods
  async find(criteria: Criteria<TDomain>): Promise<PaginatedResult<TDomain>>;
  async findById(id: string): Promise<TDomain | null>;
  async findOne(criteria: Criteria<TDomain>): Promise<TDomain | null>;
  async count(criteria?: Criteria<TDomain>): Promise<number>;
  async exists(id: string): Promise<boolean>;
  async save(entity: TDomain): Promise<void>;
  async delete(entity: TDomain): Promise<void>;
  async deleteById(id: string): Promise<void>;
}

Note: Criteria filters and ordering only support top-level columns of the primary table. Use custom methods with explicit JOINs for cross-table queries.

---

DrizzleToPersistence

Base class for persistence mappers with change tracking support.

abstract class DrizzleToPersistence<
  TDomain,
  TDb extends DrizzleClient = DrizzleClient,
> extends Mapper<TDomain, void> {
  constructor(db: TDb, uow: DrizzleUnitOfWork) { ... }

  // Required: registry for entity/table/collection mapping
  protected abstract readonly registry: EntitySchemaRegistry;

  // Required: map entity names to Drizzle table objects (and junction tables)
  protected abstract readonly tableMap: Map<string, any>;

  // Required: implement creation
  protected abstract onCreate(entity: TDomain): Promise<void>;

  // Available: current context (transaction or plain db) — typed as TDb
  protected get context(): TDb;
}

Example

import {
  DrizzleToPersistence,
  DrizzleUnitOfWork,
  Transactional,
} from "@woltz/rich-domain-drizzle";
import { EntitySchemaRegistry } from "@woltz/rich-domain";
import { users, posts, tags, postsToTags } from "./schema";

const userRegistry = new EntitySchemaRegistry()
  .register({
    entity: "User",
    table: "users",
    collections: {
      posts: { type: "owned", entity: "Post" },
    },
  })
  .register({
    entity: "Post",
    table: "posts",
    parentFk: { field: "authorId", parentEntity: "User" },
    collections: {
      tags: {
        type: "reference",
        entity: "Tag",
        junction: {
          table: "posts_to_tags", // must match tableMap key
          sourceKey: "postId",
          targetKey: "tagId",
        },
      },
    },
  })
  .register({ entity: "Tag", table: "tags" });

type DB = ReturnType<typeof drizzle<typeof schema>>;

class UserToPersistenceMapper extends DrizzleToPersistence<User, DB> {
  protected readonly registry = userRegistry;

  protected readonly tableMap = new Map<string, any>([
    ["User", users],
    ["Post", posts],
    ["Tag", tags],
    ["posts_to_tags", postsToTags], // junction table key must match registry
  ]);

  constructor(db: DB, uow: DrizzleUnitOfWork) {
    super(db, uow);
  }

  @Transactional()
  protected async onCreate(user: User): Promise<void> {
    await this.context.insert(users).values({
      id: user.id.value,
      email: user.email,
      name: user.name,
      createdAt: user.createdAt,
      updatedAt: user.updatedAt,
    });

    if (user.posts.length > 0) {
      await this.context.insert(posts).values(
        user.posts.map((p) => ({
          id: p.id.value,
          title: p.title,
          content: p.content,
          published: p.published,
          authorId: user.id.value,
          createdAt: p.createdAt,
          updatedAt: p.updatedAt,
        }))
      );
    }
  }
  // onUpdate is handled automatically by DrizzleBatchExecutor
}

---

EntitySchemaRegistry — Collection Types

Type	Behavior	Junction required?
owned	1:N — child rows belong to the parent; deletes cascade	No
reference	N:N — rows in a junction table	Yes — always

Unlike Prisma, Drizzle does not manage implicit junction tables. Every reference collection must provide a junction config. Omitting it throws MissingJunctionConfigError.

---

@Transactional Decorator

Wraps a method in a transaction automatically.

import { Transactional } from "@woltz/rich-domain-drizzle";

class CreateUserUseCase {
  constructor(
    private readonly userRepo: UserRepository,
    private readonly uow: DrizzleUnitOfWork // Required!
  ) {}

  @Transactional()
  async execute(input: CreateUserInput): Promise<User> {
    const user = User.create({ ...input, posts: [] });
    await this.userRepo.save(user);
    return user;
  }
}

Scenario	Behavior
Direct call	Creates new transaction
Already in transaction	Reuses existing one
Error thrown	Automatic rollback

The class must expose a uow property of type DrizzleUnitOfWork for the decorator to find it.

---

DrizzleBatchExecutor

Executes batch operations from AggregateChanges in the correct order for referential integrity:

1. Deletes — leaf → root (depth DESC)
2. Creates — root → leaf (depth ASC)
3. Updates — any order

onUpdate in DrizzleToPersistence is called automatically; you do not need to instantiate the executor directly.

---

Connect / Disconnect (N:N)

// Connect — adds a row to the junction table
const post = await postRepo.findById(postId);
post.addTag(new Tag({ id: new Id(tagId) }));
await postRepo.save(post);

// Disconnect — removes the row from the junction table
post.removeTag(new Tag({ id: new Id(tagId) }));
await postRepo.save(post);

---

Transactions

await uow.transaction(async () => {
  const user = User.create({ name: "Alice", email: "alice@example.com", posts: [] });
  await userRepo.save(user);

  const post = Post.restore({ ... });
  await postRepo.save(post);
  // Both committed atomically, or both rolled back on error
});

---

Limitations

• Criteria dot-field paths are not supported. Filters and ordering must reference top-level columns of the primary table. "posts.title" or "profile.name" throws DrizzleAdapterError. Add custom repository methods with explicit JOINs instead.
• contains / startsWith / endsWith use ILIKE — PostgreSQL only.

---

Error Reference

Error	When thrown
TableNotFoundError	tableMap key not found for an entity or junction name
MissingJunctionConfigError	reference collection has no junction configured
BatchOperationError	DB error during a batch create, update, or delete
NoRecordsAffectedError	delete() / deleteById() matched 0 rows
DrizzleAdapterError	Unsupported Criteria operator, dot-field path, or column not found

---

Full Example

See the fastify-with-drizzle example for a complete working application.

---

License

MIT