mapping-model

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Core Data migration failing with error: Failed to save new store after first pass of migration

In the past I had already implemented successfully automatic migration from version 1 of my data model to version 2. Now, using SDK 3.1.3, migrating from version 2 to version 3 fails with the followin[详细]

2022-12-28 09:34 分类：问答
CoreData: migration from 2 models

I have general app model, after was released any body can do plug-in for it, this plug-in can determine new db parts which merged with my general db. After some time i \'ll release new db version^ and[详细]

2022-12-26 12:49 分类：问答
How do I get a new version of a xcdatamodel to appear in xcode?

En开发者_如何学Cvironment: xcode 3.2.1, document-based core-data application. I have a document-based cocoa app which uses core data. I have made multiple versions of the data model Xcode shows a xcd[详细]

2022-12-26 09:13 分类：问答
Core Data migration problem: "Persistent store migration failed, missing source managed object model."

The Background A Cocoa Non Document Core Data project with two Managed Object Models. Model 1 stays the same. Model[详细]

2022-12-23 22:59 分类：问答
Crashes in Core Data's Inferred Mapping Model Creation (Lightweight Migration). Threading Issue?

I\'m getting random crashes when creating an inferred mapping model (with Core Data\'s lightweight migration) within my application. By the way, I have to do it programmatically in my application whil[详细]

2022-12-23 12:27 分类：问答
iPhone core data migration date to string

I have an entity that originally started with a date attribute. I have now added a attribute that is a string that I开发者_如何转开发 want to hold the date, in addition to keeping the original field.[详细]

2022-12-23 11:17 分类：问答
Is there a Java equivalent to libevent?

I\'ve written a high-throughput server that handles each request in its own thread. For requests coming in it is occasionally necessary to do RPCs to one or more back-ends. These back-end RPCs are han[详细]

2022-12-21 12:58 分类：问答
Add Core Data Index to certain Attributes via migration

For performance reasons, i want to set the Indexed Attribute to some of my entities. I created a new core data model version to perform the changes. Core Data detects the changes and migrates my model[详细]

2022-12-18 13:06 分类：问答
When would I want to use NSPropertyMapping?

Does it have to do with mapping between different data models? To which other Core Data classes is this related? It doesn\'t look too obvious to me where this belongs to. Merging data models? Or is th[详细]

2022-12-16 19:48 分类：问答
How to split an entity in Core Data migration mapping

It seems like this should be straight forward but I have not been able to find a good example of it.I have a s开发者_如何学编程imple Core Data entity that I want to split into two separate entities.Ap[详细]

2022-12-13 22:21 分类：问答