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Next.js 15 Fullstack Web Apps · Lesson

Relations and Advanced Queries with Prisma

Model one-to-many and many-to-many relations, then query across them with nested writes, include, select, filtering, and pagination.

Relations and Advanced Queries with Prisma is a free Next.js 15 Fullstack Web Apps lesson on CoddyKit — lesson 4 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Next.js 15 Fullstack Web Apps learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.

Why Relations?

Real data is connected: a user has many posts, a post has many tags. Prisma models these relations in the schema so you can traverse them in type-safe queries.

One-to-Many in the Schema

A one-to-many relation links a parent to many children via a foreign key. Define both sides in the schema.

model User {
  id    Int    @id @default(autoincrement())
  posts Post[]
}
model Post {
  id       Int  @id @default(autoincrement())
  authorId Int
  author   User @relation(fields: [authorId], references: [id])
}

Many-to-Many

Prisma supports implicit many-to-many with just array fields on both sides; it manages the join table for you.

model Post { id Int @id @default(autoincrement()) tags Tag[] }
model Tag  { id Int @id @default(autoincrement()) posts Post[] }

Including Related Data

By default queries return only the model fields. Use include to fetch related records too.

const user = await prisma.user.findUnique({
  where: { id: 1 },
  include: { posts: true },
});

Selecting Specific Fields

Use select to fetch only the columns you need — leaner payloads and faster queries. You can nest select for relations.

const posts = await prisma.post.findMany({
  select: { id: true, title: true, author: { select: { name: true } } },
});

Nested Writes

Create a parent and its children in one call with a nested create. Prisma runs it in a transaction.

await prisma.user.create({
  data: {
    name: 'Ada',
    posts: { create: [{ title: 'Hello' }, { title: 'World' }] },
  },
});

Filtering with where

Build rich filters with operators like contains, gt, in, and combine them with AND/OR.

const recent = await prisma.post.findMany({
  where: {
    published: true,
    title: { contains: 'Prisma' },
  },
});

Filtering on Relations

You can filter a parent by a condition on its children using some, every, or none.

const authors = await prisma.user.findMany({
  where: { posts: { some: { published: true } } },
});

Sorting and Pagination

Order results with orderBy and page with take/skip (offset) for classic pagination.

const page = await prisma.post.findMany({
  orderBy: { createdAt: 'desc' },
  take: 10,
  skip: 20,
});

Cursor Pagination

For large or live datasets, cursor-based pagination is more stable than offset. Pass the last seen id as a cursor.

const next = await prisma.post.findMany({
  take: 10,
  cursor: { id: lastId },
  skip: 1,
});

Avoiding N+1 Queries

Fetching a list and then querying each item separately causes the N+1 problem. Prisma avoids it: use a single include to load relations in one optimized query rather than looping.

Quick Check

Test your Prisma relations knowledge.

Recap

You learned relational querying with Prisma:

  • Model one-to-many and many-to-many relations in the schema
  • Fetch relations with include; trim fields with select
  • Nested writes create parents and children atomically
  • Filter on relations, paginate with take/skip or cursors, and avoid the N+1 problem

Frequently asked questions

Is the “Relations and Advanced Queries with Prisma” lesson free?

Yes — the full text of “Relations and Advanced Queries with Prisma” is free to read here on the web, and the Next.js 15 Fullstack Web Apps course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Next.js 15 Fullstack Web Apps course, upgrade to CoddyKit PRO.

What will I learn in “Relations and Advanced Queries with Prisma”?

Model one-to-many and many-to-many relations, then query across them with nested writes, include, select, filtering, and pagination. You practise Next.js 15 Fullstack Web Apps with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start Next.js 15 Fullstack Web Apps?

No prior experience is required. Next.js 15 Fullstack Web Apps on CoddyKit is structured for beginners through advanced learners; this is — lesson 4 of 4, so you can start here or from the beginning and move at your own pace.

How long does the “Relations and Advanced Queries with Prisma” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this Next.js 15 Fullstack Web Apps lesson?

Yes. Every Next.js 15 Fullstack Web Apps lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

All lessons in this course

  1. Introduction to Prisma ORM
  2. Prisma Schema Design and Migrations
  3. CRUD Operations with Prisma Client
  4. Relations and Advanced Queries with Prisma
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