How to fetch objects in backgound? #145

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adam · 2025-12-29T15:25:30+01:00

adam commented

2025-12-29 15:25:30 +01:00

Originally created by @sidlatau on GitHub (Jun 7, 2017).

I am trying to fetch data in background, and use fetched data in main thread, but when I try to access managed objects properties app crashes. Problem for this I think is that background context is destroyed when transaction finishes. Is it possible to change managed objects context to main somehow (simmilar to transaction.edit(object) functionality)?

DataStack.beginAsynchronous { transaction in
               let data = transaction.fetchAll(
                 From<Object>(),
                 Where(...)
                ) ?? []
               transaction.commit { _ in
                     callback(data)
               }
}

Originally created by @sidlatau on GitHub (Jun 7, 2017). I am trying to fetch data in background, and use fetched data in main thread, but when I try to access managed objects properties app crashes. Problem for this I think is that background context is destroyed when transaction finishes. Is it possible to change managed objects context to main somehow (simmilar to ```transaction.edit(object)``` functionality)? ``` DataStack.beginAsynchronous { transaction in let data = transaction.fetchAll( From<Object>(), Where(...) ) ?? [] transaction.commit { _ in callback(data) } } ```

adam added the question label 2025-12-29 15:25:30 +01:00

adam closed this issue

2025-12-29 15:25:30 +01:00

adam commented

2025-12-29 15:25:31 +01:00

@JohnEstropia commented on GitHub (Jun 7, 2017):

Yes, you need to fetch it again from your datastack:

callback(DataStack.fetchExisting(data)!)

@JohnEstropia commented on GitHub (Jun 7, 2017): Yes, you need to fetch it again from your datastack: ```swift callback(DataStack.fetchExisting(data)!) ```

adam commented

2025-12-29 15:25:31 +01:00

@sidlatau commented on GitHub (Jun 7, 2017):

That's exactly what I needed. Thanks for quick response.

@sidlatau commented on GitHub (Jun 7, 2017): That's exactly what I needed. Thanks for quick response.

adam referenced this issue

2025-12-29 15:32:44 +01:00

[PR #422] Fix SPM install + Add secure #503

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Branches Tags

develop

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

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Reference: starred/CoreStore#145