Implementing relationships in microservices with Prisma and NestJS

Question

Implementing relationships in microservices with Prisma and NestJS

Schema for User Management service:

model User {
  id                 String    @id @default(uuid())
  username           String    @unique
  email              String    @unique
  password           String
}

Schema for File Management service:

model File {
  id               String   @id @default(uuid())
  user_id          String
  user             User     @relation(fields: [user_id], references: [id])
  file_name        String
  file_description String
  file_url         String
  file_hash        String
}

My user management service and file management service are stored in different repositories using Nest Js, Thank You!

I would like to establish a relationship between the file model and the user model.

javascript sql postgresql nestjs prisma

Answer 1

Answer №1

If you want to establish a relationship between the File and User models within your Prisma setup using NestJS, follow these steps:

Establish connection between the appropriate Prisma service(s) and your NestJS application(s).
Ensure that both the User and File models in your Prisma schema contain the required fields for the relationship as specified earlier.
Create a service in your NestJS application that retrieves the correct user for each file based on the user_id field. Utilize the prisma-client package to query the Prisma API for the necessary data.
In your NestJS controller(s), utilize the service from step 3 to retrieve the relevant data and send it back in the API response.

Below is an example of how the service from step 3 could be implemented:

import { Injectable } from '@nestjs/common';
import { PrismaClient } from '@prisma/client';

@Injectable()
export class FilesService {
  private prisma = new PrismaClient();

  async getFilesWithUser() {
    const files = await this.prisma.file.findMany({
      include: {
        user: true,
      },
    });
    return files;
  }
}

And here's an example of a corresponding controller:

import { Controller, Get } from '@nestjs/common';
import { FilesService } from './files.service';

@Controller('files')
export class FilesController {
  constructor(private readonly filesService: FilesService) {}

  @Get()
  async getFilesWithUser() {
    return this.filesService.getFilesWithUser();
  }
}

Answer 2

If you want to establish a relationship between the File and User models within your Prisma setup using NestJS, follow these steps:

Establish connection between the appropriate Prisma service(s) and your NestJS application(s).
Ensure that both the User and File models in your Prisma schema contain the required fields for the relationship as specified earlier.
Create a service in your NestJS application that retrieves the correct user for each file based on the user_id field. Utilize the prisma-client package to query the Prisma API for the necessary data.
In your NestJS controller(s), utilize the service from step 3 to retrieve the relevant data and send it back in the API response.

Below is an example of how the service from step 3 could be implemented:

import { Injectable } from '@nestjs/common';
import { PrismaClient } from '@prisma/client';

@Injectable()
export class FilesService {
  private prisma = new PrismaClient();

  async getFilesWithUser() {
    const files = await this.prisma.file.findMany({
      include: {
        user: true,
      },
    });
    return files;
  }
}

And here's an example of a corresponding controller:

import { Controller, Get } from '@nestjs/common';
import { FilesService } from './files.service';

@Controller('files')
export class FilesController {
  constructor(private readonly filesService: FilesService) {}

  @Get()
  async getFilesWithUser() {
    return this.filesService.getFilesWithUser();
  }
}

Implementing relationships in microservices with Prisma and NestJS

Answer №1

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