prisma-orm

Prisma ORM Skill

Expert assistance for Prisma ORM schema design, migrations, relations, query optimization, and database integration patterns.

Capabilities

• Design Prisma schemas with proper relations
• Generate and manage database migrations
• Optimize queries for performance
• Implement type-safe database access
• Configure multi-database support
• Set up seeding and testing strategies

Usage

Invoke this skill when you need to:

• Design database schemas with Prisma
• Set up migrations and database workflows
• Optimize database queries
• Implement complex relations
• Configure Prisma with Next.js or other frameworks

Inputs

| Parameter | Type | Required | Description | |-----------|------|----------|-------------| | database | string | No | postgresql, mysql, sqlite, mongodb | | models | array | No | List of models to create | | relations | array | No | Model relationships | | features | array | No | migrations, seeding, edge |

Schema Configuration

{
  "database": "postgresql",
  "models": [
    {
      "name": "User",
      "fields": [
        { "name": "email", "type": "String", "unique": true },
        { "name": "name", "type": "String", "optional": true },
        { "name": "posts", "type": "Post", "relation": "one-to-many" }
      ]
    },
    {
      "name": "Post",
      "fields": [
        { "name": "title", "type": "String" },
        { "name": "content", "type": "String", "optional": true },
        { "name": "author", "type": "User", "relation": "many-to-one" }
      ]
    }
  ]
}

Output Structure

project/
├── prisma/
│   ├── schema.prisma           # Database schema
│   ├── migrations/             # Migration files
│   │   └── 20240101_init/
│   │       └── migration.sql
│   └── seed.ts                 # Seed script
├── lib/
│   └── db/
│       ├── prisma.ts           # Prisma client singleton
│       ├── queries/
│       │   ├── users.ts        # User queries
│       │   └── posts.ts        # Post queries
│       └── types.ts            # Extended types
└── package.json

Generated Code Patterns

Prisma Schema

// prisma/schema.prisma
generator client {
  provider        = "prisma-client-js"
  previewFeatures = ["driverAdapters"]
}

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

model User {
  id        String   @id @default(cuid())
  email     String   @unique
  name      String?
  password  String
  role      Role     @default(USER)
  posts     Post[]
  comments  Comment[]
  profile   Profile?
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt

  @@index([email])
  @@map("users")
}

model Profile {
  id        String   @id @default(cuid())
  bio       String?
  avatar    String?
  userId    String   @unique
  user      User     @relation(fields: [userId], references: [id], onDelete: Cascade)

  @@map("profiles")
}

model Post {
  id          String    @id @default(cuid())
  title       String
  slug        String    @unique
  content     String?
  published   Boolean   @default(false)
  authorId    String
  author      User      @relation(fields: [authorId], references: [id], onDelete: Cascade)
  categories  Category[]
  comments    Comment[]
  tags        Tag[]
  createdAt   DateTime  @default(now())
  updatedAt   DateTime  @updatedAt

  @@index([authorId])
  @@index([slug])
  @@map("posts")
}

model Category {
  id    String @id @default(cuid())
  name  String @unique
  posts Post[]

  @@map("categories")
}

model Tag {
  id    String @id @default(cuid())
  name  String @unique
  posts Post[]

  @@map("tags")
}

model Comment {
  id        String   @id @default(cuid())
  content   String
  postId    String
  post      Post     @relation(fields: [postId], references: [id], onDelete: Cascade)
  authorId  String
  author    User     @relation(fields: [authorId], references: [id], onDelete: Cascade)
  parentId  String?
  parent    Comment? @relation("CommentReplies", fields: [parentId], references: [id])
  replies   Comment[] @relation("CommentReplies")
  createdAt DateTime @default(now())

  @@index([postId])
  @@index([authorId])
  @@map("comments")
}

enum Role {
  USER
  ADMIN
  MODERATOR
}

Prisma Client Singleton

// lib/db/prisma.ts
import { PrismaClient } from '@prisma/client';

const globalForPrisma = globalThis as unknown as {
  prisma: PrismaClient | undefined;
};

export const prisma =
  globalForPrisma.prisma ??
  new PrismaClient({
    log:
      process.env.NODE_ENV === 'development'
        ? ['query', 'error', 'warn']
        : ['error'],
  });

if (process.env.NODE_ENV !== 'production') globalForPrisma.prisma = prisma;

export default prisma;

Query Functions

// lib/db/queries/users.ts
import { prisma } from '../prisma';
import { Prisma } from '@prisma/client';

export type UserWithPosts = Prisma.UserGetPayload<{
  include: { posts: true; profile: true };
}>;

export async function getUserById(id: string): Promise<UserWithPosts | null> {
  return prisma.user.findUnique({
    where: { id },
    include: {
      posts: {
        where: { published: true },
        orderBy: { createdAt: 'desc' },
        take: 10,
      },
      profile: true,
    },
  });
}

export async function getUserByEmail(email: string) {
  return prisma.user.findUnique({
    where: { email },
    select: {
      id: true,
      email: true,
      name: true,
      role: true,
    },
  });
}

export async function createUser(data: Prisma.UserCreateInput) {
  return prisma.user.create({
    data,
    include: {
      profile: true,
    },
  });
}

export async function updateUser(id: string, data: Prisma.UserUpdateInput) {
  return prisma.user.update({
    where: { id },
    data,
  });
}

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

export async function getUsers(params: {
  skip?: number;
  take?: number;
  where?: Prisma.UserWhereInput;
  orderBy?: Prisma.UserOrderByWithRelationInput;
}) {
  const { skip = 0, take = 10, where, orderBy = { createdAt: 'desc' } } = params;

  const [users, total] = await prisma.$transaction([
    prisma.user.findMany({
      skip,
      take,
      where,
      orderBy,
      select: {
        id: true,
        email: true,
        name: true,
        role: true,
        createdAt: true,
        _count: {
          select: { posts: true },
        },
      },
    }),
    prisma.user.count({ where }),
  ]);

  return {
    users,
    total,
    pages: Math.ceil(total / take),
  };
}

Post Queries with Relations

// lib/db/queries/posts.ts
import { prisma } from '../prisma';
import { Prisma } from '@prisma/client';

export async function getPublishedPosts(params: {
  page?: number;
  limit?: number;
  categoryId?: string;
  authorId?: string;
  search?: string;
}) {
  const { page = 1, limit = 10, categoryId, authorId, search } = params;
  const skip = (page - 1) * limit;

  const where: Prisma.PostWhereInput = {
    published: true,
    ...(categoryId && {
      categories: { some: { id: categoryId } },
    }),
    ...(authorId && { authorId }),
    ...(search && {
      OR: [
        { title: { contains: search, mode: 'insensitive' } },
        { content: { contains: search, mode: 'insensitive' } },
      ],
    }),
  };

  const [posts, total] = await prisma.$transaction([
    prisma.post.findMany({
      where,
      skip,
      take: limit,
      orderBy: { createdAt: 'desc' },
      include: {
        author: {
          select: { id: true, name: true, email: true },
        },
        categories: true,
        tags: true,
        _count: {
          select: { comments: true },
        },
      },
    }),
    prisma.post.count({ where }),
  ]);

  return {
    posts,
    pagination: {
      page,
      limit,
      total,
      pages: Math.ceil(total / limit),
    },
  };
}

export async function getPostBySlug(slug: string) {
  return prisma.post.findUnique({
    where: { s