Question: query works but Relationship objects empty #358

New Issue

Open

opened 2025-12-29 18:26:03 +01:00 by adam · 5 comments

adam commented 2025-12-29 18:26:03 +01:00

Owner

Copy Link

Copy Source

Originally created by @nneuberger1 on GitHub (Mar 19, 2021).

I can query an a primary object based on the data of a secondary relationship object like:

let localMediaUserDetail = try dataStack.fetchOne(From().where(.$mediaData ~ .$identifier == "1000"))

But after retrieving the data, I get an nil object associated on that relationship.

if let mediaData = localMediaUserDetails.mediaData {
print("!--")
print("!-- mediaData")
print("!-- identifer: (mediaData.identifier)")
print("!-- title: (mediaData.title)")
}

The above is never hit.

Here's part of my configuration:

public class LocalMediaUserDetail: CoreStoreObject {

@Field.Relationship("mediaData", inverse: \.$mediaUserDetail)
var mediaData: LocalMediaData?

}

and the related class

public class LocalMediaData: CoreStoreObject {
// parent
@Field.Relationship("mediaUserDetail")
var mediaUserDetail: LocalMediaUserDetail?

@Field.Stored("identifier")
var identifier: String = ""

@Field.Stored("title")
var title: String = ""

}

Is there something I'm doing wrong?

My google query kung fu` has been exhausted so I posted the question.. ;-)

Originally created by @nneuberger1 on GitHub (Mar 19, 2021). I can query an a primary object based on the data of a secondary relationship object like: let localMediaUserDetail = try dataStack.fetchOne(From<LocalMediaUserDetail>().where(\.$mediaData ~ \.$identifier == "1000")) But after retrieving the data, I get an nil object associated on that relationship. if let mediaData = localMediaUserDetails.mediaData { print("!--") print("!-- mediaData") print("!-- identifer: \(mediaData.identifier)") print("!-- title: \(mediaData.title)") } The above is never hit. Here's part of my configuration: public class LocalMediaUserDetail: CoreStoreObject { @Field.Relationship("mediaData", inverse: \.$mediaUserDetail) var mediaData: LocalMediaData? } and the related class public class LocalMediaData: CoreStoreObject { // parent @Field.Relationship("mediaUserDetail") var mediaUserDetail: LocalMediaUserDetail? @Field.Stored("identifier") var identifier: String = "" @Field.Stored("title") var title: String = "" } Is there something I'm doing wrong? My google query kung fu` has been exhausted so I posted the question.. ;-)

adam commented 2025-12-29 18:26:04 +01:00

Author

Owner

Copy Link

Copy Source

@JohnEstropia commented on GitHub (Mar 19, 2021):

Have you tried to query for just the relationship object? It's possible the object isn't getting saved (yet), maybe due to a transaction error or a timing issue

@JohnEstropia commented on GitHub (Mar 19, 2021): Have you tried to query for just the relationship object? It's possible the object isn't getting saved (yet), maybe due to a transaction error or a timing issue

adam commented 2025-12-29 18:26:04 +01:00

Author

Owner

Copy Link

Copy Source

@nneuberger1 commented on GitHub (Mar 19, 2021):

Do you mean directly querying the relationship like this? I do get a record back. But possible error that might be a cause?

        let localMediaData = try dataStack.fetchOne(From<LocalMediaData>().where(\.$identifier == "1000"))

        if let local = localMediaData {
            print("!-- localMediaData found")
            
            if let detail = local.mediaUserDetail {
                print("!-- localMediaUserDetail found")
            }
            else {
                print("!-- localMediaUserDetail NOT found")
            }
            
        }
        else {
            print("!-- localMediaData NOT found")
        }

Results in:

!-- localMediaData found
2021-03-18 22:43:33.413047-0500 ThingsAboveIOS QA[24096:818105] [error] error: API Misuse: Attempt to serialize store access on non-owning coordinator (PSC = 0x600001b357a0, store PSC = 0x0)
CoreData: error: API Misuse: Attempt to serialize store access on non-owning coordinator (PSC = 0x600001b357a0, store PSC = 0x0)
!-- localMediaUserDetail NOT found

@nneuberger1 commented on GitHub (Mar 19, 2021): Do you mean directly querying the relationship like this? I do get a record back. But possible error that might be a cause? let localMediaData = try dataStack.fetchOne(From<LocalMediaData>().where(\.$identifier == "1000")) if let local = localMediaData { print("!-- localMediaData found") if let detail = local.mediaUserDetail { print("!-- localMediaUserDetail found") } else { print("!-- localMediaUserDetail NOT found") } } else { print("!-- localMediaData NOT found") } Results in: !-- localMediaData found 2021-03-18 22:43:33.413047-0500 ThingsAboveIOS QA[24096:818105] [error] error: API Misuse: Attempt to serialize store access on non-owning coordinator (PSC = 0x600001b357a0, store PSC = 0x0) CoreData: error: API Misuse: Attempt to serialize store access on non-owning coordinator (PSC = 0x600001b357a0, store PSC = 0x0) !-- localMediaUserDetail NOT found

adam commented 2025-12-29 18:26:04 +01:00

Author

Owner

Copy Link

Copy Source

@nneuberger1 commented on GitHub (Mar 19, 2021):

If it helps, maybe I'm saving them improperly. I do get a success response on the completion.

dataStack.perform(
asynchronous: { (transaction) -> Void in

            print("!-- transaction starting...")
            let mediaUserDetail = transaction.create(Into<LocalMediaUserDetail>())

            // don't add the id.

            mediaUserDetail.identifier = UUID().uuidString

            let mediaData = transaction.create(Into<LocalMediaData>())
            mediaData.identifier = "1000"
            mediaData.title = "this is the media title"
            mediaUserDetail.mediaData = mediaData

            print("!-- transaction ending...")
        },
        completion: { (result) -> Void in
            print("!-- transaction completion...")

            switch result {
            case .success:
                print("!-- success!")
                
                self.findData()
                
            case .failure(let error): print("!-- error: \(error)")
            }
        }
    )

@nneuberger1 commented on GitHub (Mar 19, 2021): If it helps, maybe I'm saving them improperly. I do get a success response on the completion. dataStack.perform( asynchronous: { (transaction) -> Void in print("!-- transaction starting...") let mediaUserDetail = transaction.create(Into<LocalMediaUserDetail>()) // don't add the id. mediaUserDetail.identifier = UUID().uuidString let mediaData = transaction.create(Into<LocalMediaData>()) mediaData.identifier = "1000" mediaData.title = "this is the media title" mediaUserDetail.mediaData = mediaData print("!-- transaction ending...") }, completion: { (result) -> Void in print("!-- transaction completion...") switch result { case .success: print("!-- success!") self.findData() case .failure(let error): print("!-- error: \(error)") } } )

adam commented 2025-12-29 18:26:04 +01:00

Author

Owner

Copy Link

Copy Source

@nneuberger1 commented on GitHub (Mar 19, 2021):

I'm using the SQLiteStore as well on setup of the dataStack.

@nneuberger1 commented on GitHub (Mar 19, 2021): I'm using the SQLiteStore as well on setup of the dataStack.

adam commented 2025-12-29 18:26:05 +01:00

Author

Owner

Copy Link

Copy Source

@JohnEstropia commented on GitHub (Apr 13, 2021):

@nneuberger1 Apologies for going silent here, but have you sorted it out?
A quick google of the error

error: API Misuse: Attempt to serialize store access on non-owning coordinator

shows this is likely a multithreading issue. Are you sure your dataStack.fetch*() calls are running in the main queue?

@JohnEstropia commented on GitHub (Apr 13, 2021): @nneuberger1 Apologies for going silent here, but have you sorted it out? A quick google of the error > error: API Misuse: Attempt to serialize store access on non-owning coordinator shows this is likely a multithreading issue. Are you sure your `dataStack.fetch*()` calls are running in the main queue?

Sign in to join this conversation.

No Branch/Tag Specified

Branches Tags

develop

prototype/swift6

master

prototype/concurrency

minIOS13

prototype/containers

transactionSourceTracking

prototype/swiftui

minIOS11

swift5_3

prototype/propertyWrapperFields

prototype/propertyWrappers

prototype/propertyWrapper

Swift5

throwables

prototype/Swift_4_1

prototype/Swift_4_0

prototype/Swift_3_2

prototype/queryBuilders

temp/develop

corestore4_develop

prototype/mainContextToPSC

master_ios_7_to_9

swift_2_3

gh-pages

_corespotlight-test

9.3.0

9.2.0

9.1.0

9.0.0

8.1.0

8.0.1

8.0.0

7.3.1

7.3.0

7.2.0

7.1.0

7.0.4

7.0.3

7.0.2

7.0.1

7.0.0

6.3.2

6.3.1

6.3.0

6.2.1

6.2.0

6.1.0

6.0.0

5.3.1

5.3.0

5.2.0

5.1.1

5.1.0

5.0.0

4.2.4

4.2.3

4.2.2

4.2.1

4.2.0

4.1.4

4.1.3

4.1.1

4.1.0

4.0.5

4.0.4

4.0.3

4.0.2

4.0.1

4.0.0

4.0.0-beta3

4.0.0-beta2

4.0.0-beta

3.1.1

3.1.0

3.0.3

3.0.2

3.0.1

3.0.0

2.1.3

2.1.2

2.1.1

2.1.0

2.0.6

2.0.5

2.0.4

2.0.3

2.0.2

2.0.1

2.0.0

1.6.10

1.6.9

1.6.8

1.6.7

1.6.6

1.6.5

1.6.4

1.6.3

1.6.2

1.6.1

1.6.0

1.5.4

1.5.3

1.5.2

1.5.1

1.5.0

1.4.4

1.4.3

1.4.2

1.4.1

1.4.0

1.3.6

1.3.5

1.3.4

1.3.3

1.3.2

1.3.1

1.3.0

1.2.1

1.2.0

1.0.2

1.0.1

1.0.0

0.2.1

0.2.0

0.1.2

0.1.1

0.1.0

Labels

Clear labels

abandoned

corestore bug

discussion

duplicate

enhancement

fixed

fixed

help wanted

in progress

investigating

ios/compiler bug

irreproducible

looking for workarounds

not a bug

pending

pending docs update

pull-request

Mirrored from GitHub Pull Request

question

regression

user bug

wontfix

No labels

Milestone

No items

No Milestone

Projects

Clear projects

No projects

Assignees

Clear assignees

adam (Adam Melkus)

No Assignees

1 Participants

Notifications

Subscribe

Due Date

No due date set.

Dependencies

No dependencies set.

Reference: starred/CoreStore-JohnEstropia#358