Adding a relationship to a mergeable object

[bcbeta]

New Issue Checklist

• [X ] I am not disclosing a vulnerability.
• [ X] I have searched through existing issues.
• [ ] I can reproduce the issue with the latest versions of Parse Server and the Parse Swift SDK. using server 4.5 (back4app)

Issue Description

When adding new relationship objects to an existing mergeable object, "Object not found" error is thrown.

Steps to reproduce

var photos = [PFPhoto]()
for photoURL in photoURLs{
        var pfPhoto = PFPhoto()
        pfPhoto.thumbnailURL = photoURL
        pfPhoto.fullURL = photoURL
        photos.append(pfPhoto)
      }
      if photos.count > 0 {
               var updatedObservation = existingObservation.mergeable
               updatedObservation.observationPhotos = photos
                 _ = try await updatedObservation.save()
                  }
           }
      }
        catch {
             print(error)
           }

Actual Outcome

Save the pfPhoto and observation objects.

Expected Outcome

Throws "object not found" error

Environment

Client

• Parse Swift SDK version: 5.8
• Xcode version: 14.3.1
• Operating system (iOS, macOS, watchOS, etc.): iOS 16.4

Server

• Parse Server version: 4.5

[cbaker6]

Are you able to take a shot at a pull request with a fix and test case? If so, I’ll review it

[bcbeta]

Unfortunately I don't have the knowledge/skill to do this. Maybe someone else will encounter this issue and come up with a fix.

[cbaker6]

Looking at this further, I believe the issue is you are trying to update relationships to objects that haven't been saved yet. Is your problem fixed if you photos.saveAll() first and then update the relationships?

[cbaker6]

Feel free to reopen if my solution above doesn’t work.