@rs-tech-hub/nestjs-prisma

Prisma ORM integration for NestJS applications with PostgreSQL adapter, providing seamless database management, type-safe queries, and repository pattern support.

✨ Features

• 🔌 PostgreSQL Adapter - Built-in PrismaPg adapter with connection pooling
• 🎯 Type-Safe Queries - Full TypeScript support with Prisma Client
• 🏗️ Repository Factory - Generic repository pattern with automatic type inference
• 🔄 Lifecycle Hooks - Automatic connection management (connect/disconnect)
• 🧹 Data Cleanup - Helper methods to clean nested Prisma results
• 🌐 Global Module - Available throughout your application
• 📝 Comprehensive CRUD - Find, create, update, upsert, delete operations

📋 Prerequisites

• Node.js ≥ 20.11.1
• NestJS ≥ 11.1.6
• TypeScript ≥ 5.1.0
• Prisma ≥ 7.0.0
• PostgreSQL database

📦 Installation

npm install @rs-tech-hub/nestjs-prisma \
            @rs-tech-hub/nestjs-service-operation \
            @prisma/client \
            @prisma/adapter-pg \
            @nestjs/common \
            @nestjs/config \
            pg

yarn add @rs-tech-hub/nestjs-prisma \
         @rs-tech-hub/nestjs-service-operation \
         @prisma/client \
         @prisma/adapter-pg \
         @nestjs/common \
         @nestjs/config \
         pg

pnpm add @rs-tech-hub/nestjs-prisma \
         @rs-tech-hub/nestjs-service-operation \
         @prisma/client \
         @prisma/adapter-pg \
         @nestjs/common \
         @nestjs/config \
         pg

Schema

generator client {
provider = "prisma-client"
output = "../generated/.prisma/client"
}

// Copy the generated client folder into the @rs-tech-hub/nestjs-prisma module
// -> src/lib/generated/.prisma/client

datasource db {
provider = "postgresql"
}

🚀 Module Registration

Basic Registration

import { Module } from '@nestjs/common';
import { ConfigModule } from '@nestjs/config';
import { PrismaModule } from '@rs-tech-hub/nestjs-prisma';

@Module({
  imports: [
    ConfigModule.forRoot({
      isGlobal: true,
    }),
    PrismaModule, // Global module - available everywhere
  ],
})
export class AppModule {}

Environment Configuration

Set your database connection string in .env:

DATABASE_URL="postgresql://user:password@localhost:port/mydb?schema=public"

💻 Service Usage

Direct PrismaService Usage

import { Injectable } from '@nestjs/common';
import { PrismaService } from '@rs-tech-hub/nestjs-prisma';

@Injectable()
export class UserService {
  constructor(private prisma: PrismaService) {}

  async findAll() {
    return this.prisma.user.findMany();
  }

  async findOne(id: string) {
    return this.prisma.user.findUnique({
      where: { id },
    });
  }

  async create(data: { name: string; email: string }) {
    return this.prisma.user.create({ data });
  }

  async update(id: string, data: { name?: string; email?: string }) {
    return this.prisma.user.update({
      where: { id },
      data,
    });
  }

  async delete(id: string) {
    return this.prisma.user.delete({
      where: { id },
    });
  }
}

Data Cleanup Helper

Remove Prisma internal fields (fields starting with _):

import { Injectable } from '@nestjs/common';
import { PrismaService } from '@rs-tech-hub/nestjs-prisma';

@Injectable()
export class PostService {
  constructor(private prisma: PrismaService) {}

  async getPostsWithCommentCount() {
    const posts = await this.prisma.post.findMany({
      include: {
        _count: {
          select: { comments: true },
        },
      },
    });

    // Clean up _count and other internal fields
    return this.prisma.cleanupData(posts);
  }
}

🏗️ Repository Pattern

Creating a Repository

Use the factory to create type-safe repositories:

import { Injectable } from '@nestjs/common';
import { PrismaService, createRepository } from '@rs-tech-hub/nestjs-prisma';
import { ServiceFacilitatorService } from '@rs-tech-hub/nestjs-service-operation';
import type { User } from '@prisma/client';

const UserRepositoryBase = createRepository<User, PrismaService['user']>(
  (prisma) => prisma.user,
  'user'
);

@Injectable()
export class UserRepository extends UserRepositoryBase {
  constructor(
    prisma: PrismaService,
    serviceFacilitator: ServiceFacilitatorService
  ) {
    super(prisma, serviceFacilitator);
  }

  // Add custom methods here
  async findByEmail(email: string) {
    return this.findUnique({ email });
  }

  async findActiveUsers() {
    return this.findMany({ isActive: true });
  }
}

Repository Usage in Service

import { Injectable } from '@nestjs/common';

@Injectable()
export class UserService {
  constructor(private userRepository: UserRepository) {}

  async getUser(id: string) {
    return this.userRepository.findUnique({ id });
  }

  async getUserByEmail(email: string) {
    return this.userRepository.findByEmail(email);
  }

  async createUser(data: CreateUserDto) {
    return this.userRepository.create(data);
  }

  async updateUser(id: string, data: UpdateUserDto) {
    return this.userRepository.update({ id }, data);
  }

  async deleteUser(id: string) {
    return this.userRepository.delete({ id });
  }
}

📖 Repository API Reference

Find Methods

findMany(where?, options?)

Find multiple records with optional filtering and pagination.

const users = await repository.findMany(
  { isActive: true },
  {
    orderBy: { createdAt: 'desc' },
    take: 10,
    skip: 0,
    select: { id: true, name: true, email: true },
  }
);

findUnique(where, options?)

Find a unique record by unique identifier.

const user = await repository.findUnique(
  { id: 'user-123' },
  { include: { posts: true } }
);

findWithSelect(where, select)

Find with specific field selection (type-safe).

const user = await repository.findWithSelect(
  { email: '[email protected]' },
  { id: true, name: true, email: true }
);
// Returns: { id: string, name: string, email: string } | null

findManyWithSelect(where?, select?, options?)

Find multiple records with specific field selection.

const users = await repository.findManyWithSelect(
  { isActive: true },
  { id: true, name: true },
  { orderBy: { name: 'asc' }, take: 5 }
);

findOneWithSelect(where?, select?)

Find first record matching criteria with field selection.

const user = await repository.findOneWithSelect(
  { email: '[email protected]' },
  { id: true, name: true }
);

findWithInclude(where?, include?)

Find with included relations.

const user = await repository.findWithInclude(
  { id: 'user-123' },
  { posts: true, profile: true }
);

findManyWithInclude(where?, include?, options?)

Find multiple records with included relations.

const users = await repository.findManyWithInclude(
  { isActive: true },
  { posts: true },
  { orderBy: { createdAt: 'desc' } }
);

findWithFields(where?, fields?)

Find with specific fields (simplified API).

const user = await repository.findWithFields({ id: 'user-123' }, [
  'id',
  'name',
  'email',
]);

findManyWithFields(where?, fields?)

Find multiple records with specific fields.

const users = await repository.findManyWithFields({ isActive: true }, [
  'id',
  'name',
]);

findUniqueWithSelect(where, select)

Find unique record with field selection.

const user = await repository.findUniqueWithSelect(
  { id: 'user-123' },
  { id: true, name: true, email: true }
);

Create/Update Methods

create(data, select?)

Create a new record.

const user = await repository.create({
  name: 'John Doe',
  email: '[email protected]',
});

update(where, data, select?)

Update an existing record.

const user = await repository.update({ id: 'user-123' }, { name: 'Jane Doe' });

upsert(where, create, update, select?)

Create if not exists, update if exists.

const user = await repository.upsert(
  { email: '[email protected]' },
  { name: 'John Doe', email: '[email protected]' },
  { name: 'John Updated' }
);

Delete Methods

delete(where)

Delete a single record.

const deleted = await repository.delete({ id: 'user-123' });

deleteMany(where?)

Delete multiple records.

const result = await repository.deleteMany({ isActive: false });
// Returns: { count: number }

Utility Methods

count(where?)

Count records matching criteria.

const total = await repository.count({ isActive: true });

exists(where?)

Check if records exist.

const hasUsers = await repository.exists({ isActive: true });

Data Cleanup

cleanupData(data)

Remove internal Prisma fields (starting with _).

const cleanData = this.prisma.cleanupData(result);

📊 Advanced Usage

Transactions

import { Injectable } from '@nestjs/common';
import { PrismaService } from '@rs-tech-hub/nestjs-prisma';

@Injectable()
export class OrderService {
  constructor(private prisma: PrismaService) {}

  async createOrderWithItems(orderData: any, items: any[]) {
    return this.prisma.$transaction(async (tx) => {
      const order = await tx.order.create({ data: orderData });

      const orderItems = await Promise.all(
        items.map((item) =>
          tx.orderItem.create({
            data: { ...item, orderId: order.id },
          })
        )
      );

      return { order, orderItems };
    });
  }
}

Raw Queries

const users = await this.prisma.$queryRaw`
  SELECT * FROM "User" WHERE "email" = ${email}
`;

Middleware

constructor(configService: ConfigService) {
  super(/* ... */);

  this.$use(async (params, next) => {
    const before = Date.now();
    const result = await next(params);
    const after = Date.now();
    console.log(`Query ${params.model}.${params.action} took ${after - before}ms`);
    return result;
  });
}

💡 Best Practices

1. Use Repository Pattern: Encapsulate data access logic in repositories
2. Type Safety: Leverage TypeScript for compile-time type checking
3. Connection Pooling: The service uses pg Pool for efficient connection management
4. Transactions: Use $transaction for operations that must succeed or fail together
5. Select Fields: Use select to fetch only needed fields for better performance
6. Error Handling: Repository methods use ServiceFacilitator for consistent error handling
7. Cleanup Data: Use cleanupData() to remove Prisma internal fields from API responses

📄 License

This package is free and open source under the MIT License.

🆘 Support

For issues, questions, or contributions, please visit the RS-Tech-Hub repository.