Prisma - Rich Domain

Overview

@woltz/rich-domain-prisma provides seamless integration between rich-domain and Prisma ORM. It leverages Prisma’s nested writes and transaction support to align perfectly with rich-domain’s change tracking and Unit of Work patterns.

npm install @woltz/rich-domain @woltz/rich-domain-prisma

Unit of Work

Request-isolated transactions with AsyncLocalStorage

Repository Base Class

PrismaRepository with built-in Criteria support

Change Tracking

PrismaToPersistence with automatic change detection

Batch Operations

PrismaBatchExecutor for efficient bulk writes

For a complete working example, see the fastify-with-prisma example in the repository.

Quick Start

1. Setup

import { PrismaClient } from "@prisma/client";
import { PrismaUnitOfWork } from "@woltz/rich-domain-prisma";

const prisma = new PrismaClient();
const uow = new PrismaUnitOfWork(prisma);

2. Create Repository

import { PrismaRepository } from "@woltz/rich-domain-prisma";

class UserRepository extends PrismaRepository<User, UserRecord> {
  protected readonly model = "user";
  protected readonly includes = { posts: true, profile: true };

  constructor(prisma: PrismaClient, uow: PrismaUnitOfWork) {
    super(
      new UserToPersistenceMapper(prisma, uow),
      new UserToDomainMapper(),
      prisma,
      uow
    );
  }
}

3. Use It

const userRepository = new UserRepository(prisma, uow);

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

// Find with Criteria
const criteria = Criteria.create<User>()
  .where("name", "contains", "John")
  .orderBy("createdAt", "desc")
  .paginate(1, 10);

const result = await userRepository.find(criteria);

// Update with change tracking
const found = await userRepository.findById(user.id.value);
found.name = "John Updated";
found.posts.push(new Post({ title: "Hello", content: "World" }));
await userRepository.save(found); // Only changed data is persisted

// Delete
await userRepository.delete(found);

PrismaUnitOfWork

Manages transactions with per-request isolation using AsyncLocalStorage.

import { PrismaUnitOfWork } from "@woltz/rich-domain-prisma";

const uow = new PrismaUnitOfWork(prisma);

Transaction Execution

// Execute multiple operations atomically
await uow.transaction(async () => {
  await userRepository.save(user);
  await orderRepository.save(order);
  await notificationRepository.save(notification);
  // All or nothing - auto rollback on failure
});

Request Isolation

Each HTTP request gets its own transaction context, preventing cross-request interference:

// Request 1
app.post("/users", async (req, res) => {
  await uow.transaction(async () => {
    // This transaction is isolated to Request 1
    await userRepository.save(user);
  });
});

// Request 2 (concurrent)
app.get("/users/:id", async (req, res) => {
  // NOT affected by Request 1's transaction
  const user = await userRepository.findById(req.params.id);
});

API Reference

Method	Description
`transaction(work)`	Execute work function in a transaction
`isInTransaction()`	Check if currently in a transaction
`getCurrentContext()`	Get current transaction context or null

@Transactional Decorator

Decorator that automatically wraps a method in a transaction.

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

class CreateUserUseCase {
  constructor(
    private readonly userRepository: UserRepository,
    private readonly uow: PrismaUnitOfWork
  ) {}

  @Transactional()
  async execute(input: CreateUserInput): Promise<User> {
    // Everything here runs in a transaction automatically
    const user = new User({ ...input, posts: [] });
    await this.userRepository.save(user);
    return user;
  }
}

With Explicit UoW Parameter

You can pass the UoW instance directly to the decorator instead of relying on constructor injection:

class CreateUserUseCase {
  constructor(private readonly userRepository: UserRepository) {}

  @Transactional(myUnitOfWork)
  async execute(input: CreateUserInput): Promise<User> {
    // Uses the explicitly provided UoW
    const user = new User({ ...input, posts: [] });
    await this.userRepository.save(user);
    return user;
  }
}

UoW Resolution Order

The decorator looks for the UoW instance in this order:

Decorator parameter - @Transactional(myUow)
Instance property - this.uow
Private property - this._uow
Any property - Any property that is a PrismaUnitOfWork instance

// Option 1: Via decorator parameter
@Transactional(globalUow)
async method1() { ... }

// Option 2: Via constructor (recommended)
class MyService {
  constructor(private readonly uow: PrismaUnitOfWork) {}

  @Transactional()
  async method2() { ... }
}

// Option 3: Via any instance property
class MyService {
  unitOfWork = new PrismaUnitOfWork(prisma);

  @Transactional()
  async method3() { ... }
}

Behavior

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

PrismaRepository

Base class for repositories with full Criteria support.

import { PrismaRepository } from "@woltz/rich-domain-prisma";

abstract class PrismaRepository<TDomain, TPersistence, TContext = PrismaClientLike> {
  // Required: Prisma model name
  protected abstract get model(): string;

  // Required: Search query generator
  protected abstract generateSearchQuery(search: string): any[];

  // Optional: relations to include
  protected readonly includes: Record<string, any> = {};

  // Built-in methods
  async find(criteria: Criteria<TDomain>): Promise<PaginatedResult<TDomain>>;
  async findById(id: string): Promise<TDomain | null>;
  async findManyByIds(ids: string[]): Promise<TDomain[]>;
  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>;
  async transaction<T>(work: () => Promise<T>): Promise<T>;
}

Complete Implementation

import { PrismaRepository, PrismaUnitOfWork } from "@woltz/rich-domain-prisma";

class UserRepository extends PrismaRepository<User, UserRecord> {
  protected readonly model = "user";
  protected readonly includes = {
    posts: true,
    profile: true,
  };

  constructor(prisma: PrismaClient, uow: PrismaUnitOfWork) {
    super(
      new UserToPersistenceMapper(prisma, uow),
      new UserToDomainMapper(),
      prisma,
      uow
    );
  }
  
  // Required: implement search query generation
  protected generateSearchQuery(search: string): any[] {
    return [
      { name: { contains: search, mode: "insensitive" } },
      { email: { contains: search, mode: "insensitive" } },
    ];
  }

  // Custom query methods
  async findByEmail(email: string): Promise<User | null> {
    const data = await this.context.user.findUnique({
      where: { email },
      include: this.includes,
    });
    return data ? this.toDomainMapper.build(data) : null;
  }
}

Context Awareness

The repository automatically uses the transaction context when available:

class UserRepository extends PrismaRepository<User, UserRecord> {
  // Use this.context for transaction-aware queries
  async customQuery(): Promise<User[]> {
    const data = await this.context.user.findMany({
      where: { status: "active" },
      include: this.includes,
    });
    return data.map((d) => this.toDomainMapper.build(d));
  }
}

EntitySchemaRegistry

Maps domain entities to database tables, handles field mapping, and configures relationships.

See the complete Schema Registry documentation for all features.

Basic Registration

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

const registry = new EntitySchemaRegistry()
  .register({
    entity: "User",
    table: "user",
  })
  .register({
    entity: "Post",
    table: "post",
    fields: {
      content: "main_content", // domain → database mapping
    },
    parentFk: {
      field: "authorId",
      parentEntity: "User",
    },
  });

Collection Configuration (N:N Relations)

For N:N relationships, configure collections with type: "reference":

const registry = new EntitySchemaRegistry()
    .register({
      entity: "User",
      table: "user",
      collections: {
        // 'owned': Children entities that belong exclusively to this aggregate
        // They are created/deleted with the parent
        posts: {
          type: "owned",
          entity: "Post",
        },
      },
    })
    .register({
      entity: "Post",
      table: "post",
      // Parent foreign key for owned entities
      parentFk: {
        field: "authorId",
        parentEntity: "User",
      },
      collections: {
        // Field name related to the relationship in the domain;
        // 'posts.tags' <- Domain Relation field name is 'tags'
        tags: {
          // 'reference': Independent entities connected via junction table
          // They exist independently and are only linked/unlinked
          type: "reference",
          entity: "Tag",
          // Optional: set when the Prisma relation field name differs from the domain property name.
          // e.g. domain property: "tags", Prisma schema field: "post_tags"
          // relationName: "post_tags",
          // Junction config required for manually created pivot tables
          junction: {
            table: "tagPost",    // Pivot table name
            sourceKey: "postId", // FK to Post
            targetKey: "tagId",  // FK to Tag
          },
        },
      },
    });

Collection Types

Type	Relationship	Batch Behavior
`owned`	1:N	`createMany` / `deleteMany`
`reference`	N:N	`connect` / `disconnect`

The PrismaBatchExecutor automatically uses the correct Prisma operations based on collection type:

// For 'owned' collections (1:N):
// - Creates use: prisma.post.createMany({ data: [...] })
// - Deletes use: prisma.post.deleteMany({ where: { id: { in: [...] } } })

// For 'reference' collections (N:N):
// - Creates use: prisma.post.update({ data: { tags: { connect: [...] } } })
// - Deletes use: prisma.post.update({ data: { tags: { disconnect: [...] } } })
// Note: if the Prisma relation field name differs from the domain property name,
// set `relationName` in the collection config so the executor uses the correct field.

PrismaToPersistence

Base mapper class with change tracking integration.

import { PrismaToPersistence } from "@woltz/rich-domain-prisma";
import { EntitySchemaRegistry, AggregateChanges } from "@woltz/rich-domain";

abstract class PrismaToPersistence<TDomain, PrismaClient = PrismaClientLike> extends Mapper<TDomain, void> {
  // Required: registry for field mapping
  protected abstract readonly registry: EntitySchemaRegistry;

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

  // Required: handle entity update with changes
  protected abstract onUpdate(
    changes: AggregateChanges,
    entity: TDomain
  ): Promise<void>;

  // Returns transaction client when inside a transaction, otherwise the prisma client
  protected get context(): PrismaClient;
}

Complete Example

class UserToPersistenceMapper extends PrismaToPersistence<User> {
  protected readonly registry = new EntitySchemaRegistry()
    .register({ 
      entity: "User", 
      table: "user",
      collections: {
        posts: { type: "owned" },
        tags: { type: "reference", entity: "Tag" },
      },
    })
    .register({
      entity: "Post",
      table: "post",
      parentFk: { field: "authorId", parentEntity: "User" },
    });

  protected async onCreate(user: User): Promise<void> {
    await this.context.user.create({
      data: {
        id: user.id.value,
        name: user.name,
        email: user.email,
        posts: {
          createMany: {
            data: user.posts.map((p) => ({
              id: p.id.value,
              title: p.title,
              content: p.content,
              authorId: user.id.value,
            })),
          },
        },
        // N:N - connect existing tags
        tags: {
          connect: user.tags.map((t) => ({ id: t.id.value })),
        },
      },
    });
  }

  protected async onUpdate(
    changes: AggregateChanges,
    user: User
  ): Promise<void> {
    const executor = new PrismaBatchExecutor(this.context, {
      registry: this.registry,
    });

    await executor.execute(changes);
  }
}

PrismaBatchExecutor

Executes batch operations from AggregateChanges with proper ordering and relationship handling.

import { PrismaBatchExecutor } from "@woltz/rich-domain-prisma";

const executor = new PrismaBatchExecutor(context, {
  registry: schemaRegistry,
});

await executor.execute(changes);

Execution Order

The executor respects referential integrity:

Deletes - Leaf → Root (depth DESC)
- owned: Uses deleteMany
- reference: Uses disconnect
Creates - Root → Leaf (depth ASC)
- owned: Uses createMany
- reference: Uses connect
Updates - Any order

Convenience Function

import { executeBatch } from "@woltz/rich-domain-prisma";

// Shorthand for simple cases
await executeBatch(context, changes, {
  registry: schemaRegistry,
});

Complete Example

Domain Model

import { z } from "zod";
import { Aggregate, Entity, Id, EntityValidation } from "@woltz/rich-domain";

// Post Entity
const postSchema = z.object({
  id: z.custom<Id>((v) => v instanceof Id),
  title: z.string().min(1),
  content: z.string(),
  published: z.boolean().default(false),
});

class Post extends Entity<z.infer<typeof postSchema>> {
  protected static validation: EntityValidation<z.infer<typeof postSchema>> = {
    schema: postSchema,
  };

  get title() { return this.props.title; }
  get content() { return this.props.content; }
  get published() { return this.props.published; }

  publish() {
    this.props.published = true;
  }
}

// Tag Entity (for N:N reference)
class Tag extends Entity<{ id: Id; name: string }> {
  get name() { return this.props.name; }
}

// User Aggregate
const userSchema = z.object({
  id: z.custom<Id>((v) => v instanceof Id),
  name: z.string().min(2),
  email: z.string().email(),
  posts: z.array(z.custom<Post>((v) => v instanceof Post)),
  tags: z.array(z.custom<Tag>((v) => v instanceof Tag)),
});

class User extends Aggregate<z.infer<typeof userSchema>> {
  protected static validation = { schema: userSchema };

  get name() { return this.props.name; }
  set name(value: string) { this.props.name = value; }
  get email() { return this.props.email; }
  get posts() { return this.props.posts; }
  get tags() { return this.props.tags; }

  addPost(post: Post) {
    this.props.posts.push(post);
  }

  removePost(postId: Id) {
    const index = this.props.posts.findIndex((p) => p.id.equals(postId));
    if (index !== -1) this.props.posts.splice(index, 1);
  }

  addTag(tag: Tag) {
    if (!this.props.tags.some((t) => t.id.equals(tag.id))) {
      this.props.tags.push(tag);
    }
  }

  removeTag(tagId: Id) {
    const index = this.props.tags.findIndex((t) => t.id.equals(tagId));
    if (index !== -1) this.props.tags.splice(index, 1);
  }
}

Schema Registry

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

const schemaRegistry = new EntitySchemaRegistry()
  .register({
    entity: "User",
    table: "user",
    collections: {
      posts: { type: "owned" },
      tags: { type: "reference", entity: "Tag" },
    },
  })
  .register({
    entity: "Post",
    table: "post",
    parentFk: { field: "authorId", parentEntity: "User" },
  })
  .register({
    entity: "Tag",
    table: "tag",
  });

Mappers

import { Mapper } from "@woltz/rich-domain";
import { PrismaToPersistence, PrismaBatchExecutor } from "@woltz/rich-domain-prisma";

// Domain Mapper
class UserToDomainMapper extends Mapper<UserRecord, User> {
  build(record: UserRecord): User {
    return new User({
      id: Id.from(record.id),
      name: record.name,
      email: record.email,
      posts: record.posts.map(
        (p) => new Post({
          id: Id.from(p.id),
          title: p.title,
          content: p.content,
          published: p.published,
        })
      ),
      tags: record.tags.map(
        (t) => new Tag({ id: Id.from(t.id), name: t.name })
      ),
    });
  }
}

// Persistence Mapper
class UserToPersistenceMapper extends PrismaToPersistence<User> {
  protected readonly registry = schemaRegistry;

  protected async onCreate(user: User): Promise<void> {
    await this.context.user.create({
      data: {
        id: user.id.value,
        name: user.name,
        email: user.email,
        posts: {
          createMany: {
            data: user.posts.map((p) => ({
              id: p.id.value,
              title: p.title,
              content: p.content,
              published: p.published,
              authorId: user.id.value,
            })),
          },
        },
        tags: {
          connect: user.tags.map((t) => ({ id: t.id.value })),
        },
      },
    });
  }

  protected async onUpdate(changes: AggregateChanges, user: User): Promise<void> {
    const executor = new PrismaBatchExecutor(this.context, {
      registry: this.registry,
    });

    await executor.execute(changes);
  }
}

Repository

import { PrismaRepository, PrismaUnitOfWork } from "@woltz/rich-domain-prisma";

class UserRepository extends PrismaRepository<User, UserRecord> {
  protected readonly model = "user";
  protected readonly includes = { posts: true, tags: true };

  constructor(prisma: PrismaClient, uow: PrismaUnitOfWork) {
    super(
      new UserToPersistenceMapper(prisma, uow),
      new UserToDomainMapper(),
      prisma,
      uow
    );
  }

  protected generateSearchQuery(search: string): any[] {
    return [
      { name: { contains: search, mode: "insensitive" } },
      { email: { contains: search, mode: "insensitive" } },
    ];
  }

  async findByEmail(email: string): Promise<User | null> {
    const data = await this.context.user.findUnique({
      where: { email },
      include: this.includes,
    });
    return data ? this.toDomainMapper.build(data) : null;
  }
}

Use Case

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

class UserService {
  constructor(
    private readonly userRepository: UserRepository,
    private readonly uow: PrismaUnitOfWork
  ) {}

  @Transactional()
  async addTagToUser(userId: string, tag: Tag): Promise<User> {
    const user = await this.userRepository.findById(userId);
    if (!user) {
      throw new EntityNotFoundError("User", userId);
    }

    user.addTag(tag); // N:N reference
    await this.userRepository.save(user); // Uses connect

    return user;
  }

  @Transactional()
  async removeTagFromUser(userId: string, tagId: string): Promise<User> {
    const user = await this.userRepository.findById(userId);
    if (!user) {
      throw new EntityNotFoundError("User", userId);
    }

    user.removeTag(Id.from(tagId)); // N:N reference
    await this.userRepository.save(user); // Uses disconnect

    return user;
  }
}

Error Handling

The adapter provides specific error types:

import {
  PrismaRepositoryError,
  ModelNotFoundError,
  TableNotFoundError,
  NoRecordsAffectedError,
  BatchOperationError,
} from "@woltz/rich-domain-prisma";

try {
  await userRepository.save(user);
} catch (error) {
  if (error instanceof ModelNotFoundError) {
    // Model not in Prisma schema
  } else if (error instanceof TableNotFoundError) {
    // Entity not in registry
  } else if (error instanceof BatchOperationError) {
    // Batch operation failed
  }
}

Complete Example

See the fastify-with-prisma example for a complete working application demonstrating:

User aggregate with Posts (1:N owned)
Post with Tags (N:N reference via junction table)
Case-insensitive search
Transaction management
CRUD operations
Domain events with BullMQ

API Reference

Exports

// Unit of Work
export { PrismaUnitOfWork, Transactional, getCurrentPrismaContext };
export type { PrismaTransactionContext, PrismaClientLike, PrismaTransactionClient };

// Repository
export { PrismaRepository };
export type { PrismaRepositoryConfig };

// Mapper
export { PrismaToPersistence };

// Batch Executor
export { PrismaBatchExecutor, executeBatch };
export type { BatchExecutorConfig };

// Errors
export {
  PrismaRepositoryError,
  ModelNotFoundError,
  TableNotFoundError,
  NoRecordsAffectedError,
  BatchOperationError,
};

PrismaUnitOfWork Methods

Method	Returns	Description
`transaction(work)`	`Promise<T>`	Execute work in transaction
`isInTransaction()`	`boolean`	Check if in transaction
`getCurrentContext()`	`PrismaTransactionContext \| null`	Get current context

PrismaRepository Methods

Method	Returns	Description
`find(criteria)`	`Promise<PaginatedResult<T>>`	Find with criteria
`findById(id)`	`Promise<T \| null>`	Find by ID
`findManyByIds(ids)`	`Promise<T[]>`	Find multiple by IDs
`count(criteria?)`	`Promise<number>`	Count entities
`exists(id)`	`Promise<boolean>`	Check if exists
`save(entity)`	`Promise<void>`	Create or update
`delete(entity)`	`Promise<void>`	Delete entity
`deleteById(id)`	`Promise<void>`	Delete by ID
`transaction(work)`	`Promise<T>`	Execute in transaction

Getting Started

Core Concepts

Validation

Criteria

Repository

Integrations

Documentation Index

​Overview

Unit of Work

Repository Base Class

Change Tracking

Batch Operations

​Quick Start

​1. Setup

​2. Create Repository

​3. Use It

​PrismaUnitOfWork

​Transaction Execution

​Request Isolation

​API Reference

​@Transactional Decorator

​With Explicit UoW Parameter

​UoW Resolution Order

​Behavior

​PrismaRepository

​Complete Implementation

​Context Awareness

​EntitySchemaRegistry

​Basic Registration

​Collection Configuration (N:N Relations)

​Collection Types

​PrismaToPersistence

​Complete Example

​PrismaBatchExecutor

​Execution Order

​Convenience Function

​Complete Example

​Domain Model

​Schema Registry

​Mappers

​Repository

​Use Case

​Error Handling

​Complete Example

​API Reference

​Exports

​PrismaUnitOfWork Methods

​PrismaRepository Methods

Overview

Quick Start

1. Setup

2. Create Repository

3. Use It

PrismaUnitOfWork

Transaction Execution

Request Isolation

API Reference

@Transactional Decorator

With Explicit UoW Parameter

UoW Resolution Order

Behavior

PrismaRepository

Complete Implementation

Context Awareness

EntitySchemaRegistry

Basic Registration

Collection Configuration (N:N Relations)

Collection Types

PrismaToPersistence

Complete Example

PrismaBatchExecutor

Execution Order

Convenience Function

Complete Example

Domain Model

Schema Registry

Mappers

Repository

Use Case

Error Handling

Complete Example

API Reference

Exports

PrismaUnitOfWork Methods

PrismaRepository Methods