Editing objects with attachments

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1

Hi, quite new here to Palantir Foundry. just a few questions regarding ontology objects with attachments. I am using this function createAttachmentUpload to upload attachments. What function in the OSDK can I use to retrieve the attachment based on rid? Do we have documents on how to manipulate attachments from the OSDK?

I also have an edit function that accepts an attachment parameter. How can I change the attachment without reuploading? For example, I want to change the attachment property of an object from attachment A to attachment B, where attachment B has already been uploaded before.

const result = await client(editObj).applyAction(
      {
        Obj: {
          $primaryKey,
          $apiName: "Obj",
          $objectType: "",
          $title: undefined,
        },
        file, //what to pass here?
        another_property,
      },
2

If you look at the API documentation on your Dev console application, you will find Uploading Attachments section which explains how to do that.

async function uploadMyFile() {
    const file = await fetch("file.json");
    const blob = await file.blob();
    return createAttachmentUpload(blob, "myFile");
}

and in your action you do something like this:

import { addPermit } from "@osdk-sample-app-20/sdk";
import { AttachmentUpload } from "@osdk/api";

const attachment: AttachmentUpload = uploadMyFile();
const result = await client(addPermit).applyAction(
    {
    "Aircraft": { $primaryKey: primaryKeyValue, /* other properties */ }, 
    "permit": attachment
    },
    {
    $returnEdits: true,
    }
);

if (result.type === "edits") {
    // for new objects and updated objects edits will contain the primary key of the object
    const updatedObject = result.editedObjectTypes[0];
    console.log("Updated object", updatedObject);
}
3

I am familiar with fetchContents()

const objValue = objValue.attachmentProperty.fetchContents()

but is there a more direct way based on the rid, like downloadAttachment(rid)?

4

alright, thanks! is there a function in the osdk to read back the uploaded attachment given its rid? another API will be reading it, is there a function like readAttachment?

5

If you search the API documentation on our public web site you can find this method
Get Attachment Property Content By Rid
Which I think is what you are looking for.
You can write a fetch function to call this API and use the token you are granted in the SDK by calling auth.getTokenOrNothing()