> ## Documentation Index
> Fetch the complete documentation index at: https://forest-chore-open-api.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Dummy datasource

> In-memory test datasource for development, testing, and demonstrations

The Dummy datasource is an in-memory test datasource for **testing and learning Forest back-end functionality only**. It is not intended for production use.

<Warning>
  This datasource is strictly for development, testing, and learning purposes. All data is stored in memory and resets on application restart.
</Warning>

## Basic usage

```javascript theme={null}
import { createAgent } from '@forestadmin/agent';
import { createDummyDataSource } from '@forestadmin/datasource-dummy';

const agent = createAgent(options);

agent.addDataSource(createDummyDataSource());
```

## Sample data

The dummy datasource provides 4 pre-configured collections with realistic relationships:

### Collections

**persons** (Authors)

* `id` (Number, Primary Key)
* `firstName` (String)
* `lastName` (String)

Sample: Edward O. Thorp, Isaac Asimov, Roberto Saviano, Stephen King

**books**

* `id` (Number, Primary Key)
* `title` (String)
* `publication` (Date)
* `authorId` (Number)

Sample: Beat the dealer, Foundation, Gomorrah, Misery, Christine, Running Man

**libraries**

* `id` (Number, Primary Key)
* `name` (String)

Sample: Mollat, Cultura, Amazon

**librariesBooks** (Junction table)

* `bookId` (Number, Primary Key)
* `libraryId` (Number, Primary Key)

### Relationships

The datasource demonstrates all common relationship types:

* **One-to-Many**: persons → books (one author has many books)
* **Many-to-One**: books → persons (many books have one author)
* **Many-to-Many**: books ↔ libraries (via librariesBooks junction table)

## Features

* **Full CRUD operations** - Create, read, update, and delete records
* **Filtering** - 16+ filter operators (Contains, StartsWith, Equal, In, etc.)
* **Sorting** - All columns are sortable
* **Pagination** - Full pagination support
* **Relationships** - Demonstrates 1-to-Many, Many-to-One, and Many-to-Many relationships

## Source code

This connector is open source. Browse the code or contribute on GitHub: [`@forestadmin/datasource-dummy`](https://github.com/ForestAdmin/agent-nodejs/tree/main/packages/datasource-dummy).