Function getByItemId

getByItemId(dataSourceId, itemId): Promise<JAttachment[]>
JMap.Attachment.getByItemId

Fetches every attachment linked to a specific item (row) of a data source.
Parameters
- dataSourceId: JId
  the data source identifier that contains the item
- itemId: JId
  the identifier of the item whose attachments you want
Returns Promise<JAttachment[]>
Example
```
JMap.Attachment
 .getByItemId("f47ac10b-58cc-4372-a567-0e02b2c3d479", 7088)
 .then(attachments => console.log("Attachments found:", attachments.length))
 .catch(error => console.error("An error occurred while fetching attachments", error))
```