https://github.com/liammartens/relational-statestore

https://github.com/liammartens/relational-statestore

Last synced: 7 days ago
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• Host: GitHub
• URL: https://github.com/liammartens/relational-statestore
• Owner: LiamMartens
• License: mit
• Created: 2023-11-24T20:49:34.000Z (12 months ago)
• Default Branch: main
• Last Pushed: 2024-02-03T15:16:45.000Z (9 months ago)
• Last Synced: 2024-10-18T16:13:47.637Z (18 days ago)
• Language: TypeScript
• Size: 136 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Relational Statestore

[![npm](https://img.shields.io/npm/v/relational-statestore)](https://www.npmjs.com/package/relational-statestore) [![npm](https://img.shields.io/badge/license-MIT-blue)](https://www.npmjs.com/package/relational-statestore)

This is an in-memory graph like datastore for managing relationships between nodes.

The purpose of this library is not persistent data storage but rather a relational state which can be useful for certain use cases such as:

- Keeping track of child/parent relationships

- Keeping track of related DOM elements

## Usage

```typescript

import { RelationalStatestore, Relationship } from "relational-statestore";

type UserType = {

  id: string;

  name: string;

};

// create the local store

export const store = new RelationalStatestore();

// add nodes

const userA = { id: "a", name: "User A" };

const userB = { id: "b", name: "User B" };

const nodeA = store.addNode(userA);

const nodeB = store.addNode(userB);

// add relationship

class AreFriends extends Relationship {}

// it is possible to use the original data objects to refer to the nodes

store.addEdge(userA, userB, new AreFriends());

// it is also possible to use the nodes itself

store.addEdge(nodeA, nodeB, new AreFriends());

// we can now find all the edges for our users

const allEdges = store.edgesFor(userA);

// the result is an array with 1 edge: Edge

// we can also look for specific relationships

const friends = store.relationshipsFor(userA, AreFriends);

// this will return the same list - filtered by AreFriends

```

## Subscribing to events

It is also possible to subscribe to the store to run side-effects.

```typescript

import { RelationalStatestore, Relationship } from "relational-statestore";

type UserType = {

  id: string;

  name: string;

};

// create the local store

export const store = new RelationalStatestore();

store.subscribe("*", (...event) => {});

store.subscribe("node:added", (eventname, node) => {});

store.subscribe("node:data:updated", (eventname, node) => {});

```