umbraco-repository-pattern

name	umbraco-repository-pattern
description	Understand and use repositories in Umbraco backoffice (foundational concept)
version	1.0.0
location	managed
allowed-tools	Read, Write, Edit, WebFetch

Umbraco Repository Pattern

What is it?

Repositories are the Backoffice's entry point for data requests and update notifications, abstracting data access from various sources (server, offline database, store, Signal-R). They provide a structured way to manage data operations, separating business logic from direct data access for easier maintenance and scalability. Repositories use data sources behind the scenes, allowing consumers to work with data without knowing where or how it's stored.

CRITICAL: API Authentication

NEVER use raw fetch() for custom API calls. This will result in 401 Unauthorized errors.

ALWAYS use a generated OpenAPI client configured with Umbraco's auth context. See the umbraco-openapi-client skill for setup instructions.

Documentation

Always fetch the latest docs before implementing:

• Main docs: https://docs.umbraco.com/umbraco-cms/extend-your-project/backoffice-extensions/foundation/repositories
• Working with Data: https://docs.umbraco.com/umbraco-cms/extend-your-project/backoffice-extensions/foundation
• Store: https://docs.umbraco.com/umbraco-cms/extend-your-project/backoffice-extensions/foundation
• Foundation: https://docs.umbraco.com/umbraco-cms/extend-your-project/backoffice-extensions/foundation

Workflow

1. Fetch docs - Use WebFetch on the URLs above
2. Ask questions - What data to manage? CRUD operations needed? Data source type?
3. Generate code - Implement repository and data source based on latest docs
4. Explain - Show what was created and how to use it

Minimal Examples

Repository Registration

import { umbExtensionsRegistry } from '@umbraco-cms/backoffice/extension-registry';
import { MyRepository } from './my-repository.js';

const repositoryManifest = {
  type: 'repository',
  alias: 'My.Repository',
  name: 'My Repository',
  api: MyRepository,
};

umbExtensionsRegistry.register(repositoryManifest);

Basic Repository Implementation (Using OpenAPI Client)

import { UmbControllerBase } from '@umbraco-cms/backoffice/class-api';
import type { UmbControllerHost } from '@umbraco-cms/backoffice/controller-api';
// Import from generated OpenAPI client (see umbraco-openapi-client skill)
import { MyExtensionService } from '../api/index.js';

export class MyRepository extends UmbControllerBase {
  constructor(host: UmbControllerHost) {
    super(host);
  }

  async getAll() {
    // Use generated OpenAPI client - handles auth automatically
    const response = await MyExtensionService.getAll();
    return response.data;
  }

  async getById(id: string) {
    const response = await MyExtensionService.getById({ path: { id } });
    return response.data;
  }

  async create(: ) {
     response =  .({ : data });
     response.;
  }

   () {
     response =  .({
      : { id },
      : data,
    });
     response.;
  }

   () {
     .({ : { id } });
  }
}

Using Repository in Context

import { UmbContextBase } from '@umbraco-cms/backoffice/class-api';
import { UmbArrayState } from '@umbraco-cms/backoffice/observable-api';
import { MyRepository } from './my-repository.js';

export class MyContext extends UmbContextBase<MyContext> {
  #repository = new MyRepository(this);
  #items = new UmbArrayState([]);

  readonly items = this.#items.asObservable();

  async loadItems() {
    const data = await this.#repository.getAll();
    this.#items.setValue(data);
  }

  async createItem(item: any) {
    const newItem = await this.#repository.create(item);
    this.#items.setValue([...this.#items.getValue(), newItem]);
  }

  async () {
     .#repository.(id);
    .#items.(
      .#items.().( item. !== id)
    );
  }
}

Repository with Data Source (Using OpenAPI Client)

import { UmbControllerBase } from '@umbraco-cms/backoffice/class-api';
import { MyDataSource } from './my-data-source.js';

export class MyRepository extends UmbControllerBase {
  #dataSource = new MyDataSource(this);

  async getAll() {
    return await this.#dataSource.getAll();
  }

  async getById(id: string) {
    return await this.#dataSource.getById(id);
  }
}

// Data Source - uses generated OpenAPI client
import { MyExtensionService } from '../api/index.js';

export class MyDataSource extends UmbControllerBase {
  async getAll() {
    // Use OpenAPI client - NEVER raw fetch()
    const response = await MyExtensionService.getAll();
     response.;
  }

   () {
     response =  .({ : { id } });
     response.;
  }
}

Tree Repository Example

import { UmbControllerBase } from '@umbraco-cms/backoffice/class-api';
import { UmbTreeDataSource } from '@umbraco-cms/backoffice/tree';

export class MyTreeRepository extends UmbControllerBase {
  #dataSource: UmbTreeDataSource;

  constructor(host: UmbControllerHost) {
    super(host);
    this.#dataSource = new MyTreeDataSource(this);
  }

  async getRootItems() {
    return await this.#dataSource.getRootItems();
  }

  async getChildrenOf(parentKey: string) {
    return await this.#dataSource.getChildrenOf(parentKey);
  }

  async getAncestorsOf(key: string) {
    return await this.#dataSource.getAncestorsOf(key);
  }
}

Key Concepts

Repository: Entry point for data operations, abstracts data access

Data Source: Underlying mechanism that actually fetches/stores data

Store: Optional layer that holds data throughout the session using State objects

Host Element: Repository must be instantiated with a host for proper context rendering

Separation of Concerns:

• Repository = what operations are available
• Data Source = how data is fetched/stored
• Store = where data is cached
• Context = who coordinates it all

Benefits:

• Loose coupling between UI and data layer
• Swappable data sources
• Easier testing and maintenance
• Consistent data access patterns

Usage Pattern:

1. Define repository with CRUD methods
2. Implement data source for actual I/O
3. Instantiate repository in context
4. Context coordinates state and repository
5. UI observes state from context

That's it! Always fetch fresh docs, keep examples minimal, generate complete working code.