fetched-property

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Core Data get sum of values. Fetched properties vs. propagation

I\'m relatively new to Core Data (coming from an SQLite background). Just finished reading the \'Core Data for iOS\' book but I\'m left with a number of baffling questions when I started modelling an[详细]

2023-04-08 10:31 分类：问答
does anyone have a working example of a fetched-property in core-data?

I have tried to use fetched properties a couple of times, and although it seems to be the right approach, it never works.[详细]

2023-04-03 15:13 分类：问答
Stored NSFetchRequest returns error "A fetch request must have an entity"

I added a fetched property to my entity at data model. I did not add its predicate. I retrieve it with fetchRequestTemplateForName, but when execute it I got this error \"executeFetchRequest:error: A[详细]

2023-03-29 13:44 分类：问答
Average as a fetched property?

I\'m not sure if I\'ve understood Fetched Properties c开发者_开发百科orrectly, so do tell me if I\'m going the wrong way with this and should be doing something else instead.[详细]

2023-03-29 10:53 分类：问答
core data fetched properties and NSFetchedResultsController

I read this in the core data programming guide: In many cases, your initial fetch retrieves a starting node in the object graph and thereafter you do not execute fetch requests, you simply follow re[详细]

2023-03-29 05:15 分类：问答
How do I create an NSFetchedPropertyDescription programmatically?

I have a pre-existing NSManagedObjectModel that I created with the Xcode GUI.I want to create a sorted fetched property, which Xcode 3.2\'s GUI doesn\'t support.I do all of this before creating my NSP[详细]

2023-02-23 21:00 分类：问答
Core Data: Fetched attributes with joined tables

I have a Host which has a many-to-many relationship with services. The relation is through a join table \"hostServices\". I would like to fetch te services related to a Host via a \"fetched property\"[详细]

2023-01-23 18:01 分类：问答
How do ensure that a Core Data Fetched Property is fetched from the context rather than the cache?

I have a managed Objec开发者_如何学Pythont Model that contains 2 Entities. One of the entities (Lets Call it EA) calculates it\'s properties by referencing some properties in a sub-set of the second[详细]

2023-01-17 20:19 分类：问答
《四面楚歌》MP3歌词-王以太 / 法老 / 艾热 / Doughboy / Anti-Ge？

四面楚歌王以太/ 法老/ 艾热/ Doughboy/ Anti-General 专辑：四面楚歌语种：国语发行时间：2019-08-31[详细]

2022-12-22 23:09 分类：问答