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The problemSetRouter provides two public query procedures for listing and retrieving AI/ML problem sets. Problem sets are curated collections of coding challenges grouped by topic (e.g., NumPy fundamentals, ML model training). No authentication is required to call either procedure.

​
problemSet.getAll

Returns every problem set in the database, ordered by creation date (newest first). Each record includes a _count.problems field so you can display problem counts without fetching the full problem list. Type: query — Auth: public Input: none 
import { api } from '~/trpc/server';

const sets = await api.problemSet.getAll();
// sets[0]._count.problems => number of problems in the set

​
Response

An array of ProblemSet objects. Each element has the following shape:
​
id
string
required
Unique CUID identifier for the problem set.
​
title
string
required
Human-readable title of the problem set (e.g., "NumPy Fundamentals").
​
slug
string
required
URL-safe unique identifier used in routing (e.g., "numpy-fundamentals").
​
description
string | null
Optional longer description of the problem set. Stored as full text; may be null.
​
createdAt
DateTime
required
ISO 8601 timestamp of when the problem set was created.
​
updatedAt
DateTime
required
ISO 8601 timestamp of the last update to the problem set record.
​
_count
object
required
Prisma aggregation object included on every result.

​
problemSet.getBySlug

Fetches a single problem set by its unique slug, including the full ordered list of problems that belong to it. Returns null if no matching record is found. Type: query — Auth: public Input: { slug: string }
​
slug
string
required
The URL-safe slug of the problem set to fetch (e.g., "numpy-fundamentals"). Validated by Zod as a non-empty string.
import { api } from '~/trpc/server';

const set = await api.problemSet.getBySlug({ slug: 'numpy-fundamentals' });

if (!set) {
  notFound();
}

// set.problems is ordered by `order` ascending

​
Response

A single ProblemSet object — or null when no record matches the given slug.
​
id
string
required
Unique CUID identifier for the problem set.
​
title
string
required
Human-readable title (e.g., "NumPy Fundamentals").
​
slug
string
required
URL-safe unique identifier.
​
description
string | null
Optional full-text description of the problem set.
​
createdAt
DateTime
required
ISO 8601 creation timestamp.
​
updatedAt
DateTime
required
ISO 8601 last-updated timestamp.
​
problems
Problem[]
required
Ordered list of problems that belong to this set (orderBy: { order: 'asc' }).
getBySlug uses Prisma’s findUnique, so it performs a single indexed lookup on the slug column. The included problems array is sorted by order ascending, reflecting the intended curriculum sequence.

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