core-data

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CoreData Automatic Lightweight Migration Error

I am trying to use automatic lightweight migration in my app.I did the following steps: Create new model version.[详细]

2023-04-10 18:24 分类：问答
CoreData: 'NSInternalInconsistencyException', reason: '+entityForName: could not locate an entity named 'DocumentLocations' in this model.'

I\'ve s开发者_高级运维uddenly been tripped up by a bizarre issue.I have a rather extensive CoreData data model, and I\'ve copied it (and the project containing it) over to a new project for a prototyp[详细]

2023-04-10 18:08 分类：问答
Trying to debug error: *** Assertion failure in -[UITableView _createPreparedCellForGlobalRow:withIndexPath:]

I have a simple UITableviewController that used to work fine and now something has broken it.. It presents a simple form that allows me to add a simple 3-field record to a core-data managed object.[详细]

2023-04-10 15:53 分类：问答
UITableView and CoreDate "Invalid update: invalid number of rows in section" After returning from another view and Saving

I have a UITableView that is backed by core data with sections grouped by date.I can delete and add while I\'m on the that view just fine.The NSFetchController and the UITableView stay in sync just fi[详细]

2023-04-10 14:56 分类：问答
Bad performance Core Data CONTAINS predicate

I\'m using the NSFetchedResultsController to show some search results in a UITableView. The search results are requested by the following predicate:[详细]

2023-04-10 14:45 分类：问答
NSMergeConflict with multiple threads

A 1 <----> * B I\'m using core data in an iOS application.A and B are entities that have a 1-to-many relationship between A and B.I have a background thread that updates and creates B. A is up[详细]

2023-04-10 12:32 分类：问答
Core data save an object with a relationship to an existing object in the database

I am trying to save a new Object to my context, that will have a foreign key reference (relationship many-to-many) to an object already in the database.[详细]

2023-04-10 10:05 分类：问答
Core Data syncronization procedure with Web service

I\'m developing an application that needs to be syncronized with remote database. The database is connected to the a web-based application that user able to modify some records on the web page.(add/re[详细]

2023-04-10 08:57 分类：问答
CoreData model design: Is excessive use of NSFetchRequest a symptom of a poorly designed model?

Core Data objects can be retrieved by using an NSFetchRequest or by following relationships with other objects in the graph. Is it fair to say that in a well designed model will contain sufficient rel[详细]

2023-04-10 08:45 分类：问答
Displaying images in uiwebview from core data record

So I have an app I\'ve written for the iPad, and I\'d like to be able to allow users to insert images into their documents by selecting an image from an album or the camera. All that works great. Beca[详细]

2023-04-10 04:05 分类：问答