How to use buildEntities?

[draylegend]

I'm getting following error:

./libs/shared/src/lib/web-socket.ts:3:0-70 - Error: Module not found: Error: Can't resolve '@ngneat/elf-entities/lib/entity.utils' in 'D:\dev\web\practice\tick-ts\libs\shared\src\lib'

after importing buildEntities function

import { buildEntities } from '@ngneat/elf-entities/lib/entity.utils';

What am I doing wrong?

[NetanelBasal]

buildEntities is an internal function, why do you need it?

[draylegend]

I'm trying to create a webSocket wrapper that uses store, to update the entities or props.

Imagine we have the following scenario of a stock price observer:

• A company should be observed/subscribed if it gets added to the favorite list and vice versa - should be unsubscribed if it gets removed from the favorites. Should reconnect if connection gets lost.
• Web socket messages should be sent over a single connection.
• State persistence in local storage of selected/favorite companies. Here I just persist activeIds.

Possible messages:

Request

{ "action": "subscribe", "isin": "US6541061031" }

Response

{ "action": "subscribe", "isin": "US6541061031", "ok": true/false }

This is the actual data flow:

{ "action": "tick", "isin": "US6541061031", "tick": { "ask": "...", "bid": "...", "last": "...", "timestamp": "..." } }

Request

{ "action": "unsubscribe", "isin": "US6541061031" }

Response

{ "action": "unsubscribe", "isin": "US6541061031", "ok": true/false }

Request

{ "action": "ping" }

Response

{ "action": "ping", "info": "pong" }

Additionally I load companies. Based on ISIN a can associate a company with a tick.

I thought I can use buildEntities to construct the favorite list (and save it to the store) based on persisted activeIds.

Maybe there is a better approach to handle web socket messages, reconnection and creation of the favorite list?

[NetanelBasal]

Try to think about a similar approach as https://datorama.github.io/akita/docs/additional/events/