@textile/hub > Client > has

Client.has() method

Check if a given instance exists in the collection.

Signature:

has(threadID: ThreadID, collectionName: string, IDs: string[]): Promise<boolean>;

Parameters

Parameter	Type	Description
threadID	ThreadID	the ID of the database
collectionName	string	The human-readable name of the model to use.
IDs	string[]	An array of instance ids to check for.

Returns:

Promise<boolean>

Example

Check if an instance exists

import {Client, ThreadID, Where} from '@textile/hub'

async function instanceExists (client: Client, threadID: ThreadID, id: string) {
  return await client.has(threadID, 'astronauts', [id])
}