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To create a NestJS application with Prisma, You'll need to follow several steps to set up Prisma, configure your database, and create the necessary modules, services, and controllers to handle blog posts. I'll guide you through the entire process, including setting up Prisma with MongoDB, configuring NestJS modules, and creating a blogging post feature.

1. Install NestJS and Create a New Project

npm install -g @nestjs/cli 
nest new project-name 
cd project-name

2. Install Prisma and Initialize Prisma

Using npm:

npm install @prisma/client 
npm install -D prisma

Using yarn:

yarn add @prisma/client 
yarn add -D prisma

Initialize Prisma for mongoDB:

npx prisma init --datasource-provider mongodb

This will create a prisma folder with schema.prisma and a .env file.

Open prisma/schema.prisma and update the datasource block to use MongoDB:

datasource db {
  provider = "mongodb"
  url      = env("DATABASE_URL")
}


generator client {
  provider = "prisma-client-js"
}

Update your .env file with the MongoDB connection string:

DATABASE_URL="mongodb://localhost:27017/abc"

Make sure your MongoDB server is running locally or replace the connection string with your remote MongoDB server details.

4. Define Prisma Models

model User {
  id    String @id @default(auto()) @map("_id") @db.ObjectId
  email String @unique
  name  String?
  posts Post[]
}


model Post {
  id        String   @id @default(auto()) @map("_id") @db.ObjectId
  title     String
  content   String
  published Boolean  @default(false)
  authorId  String   @db.ObjectId
  author    User     @relation(fields: [authorId], references: [id])
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt
}

These models define the basic structure of users and posts in your blogging platform.

6. Generate Prisma Client

Generate the Prisma client, which allows you to interact with the database:

npx prisma generate

7. Create Prisma Service in NestJS

Inside the src directory, create a new file prisma.service.ts:

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

import { PrismaClient } from '@prisma/client';


@Injectable()
export class PrismaService extends PrismaClient implements OnModuleInit {
  async onModuleInit() {
    await this.$connect();
  }
}

8. Create Prisma Module in NestJS

Inside the src directory, create a new file prisma.module.ts:

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

import { PrismaService } from './prisma.service';


@Module({
  providers: [PrismaService],
  exports: [PrismaService],
})
export class PrismaModule {}

9. Add primsa in app module:

import { Module } from '@nestjs/common';
import { AppController } from './app.controller';
import { AppService } from './app.service';
import { PrismaService } from './prisma.service';


@Module({
  imports: [],
  controllers: [AppController],
  providers: [AppService,PrismaService],
})
export class AppModule {}