I have a one to many entity relationship between two entities:
EntityP (Parent) <-->> EntityC (Child)
Attributes and Relationships:
EntityP.title
EntityP.dateTimeStamp
EntityP.PtoC (relationship)
EntityC.title
EntityC.dateTimeStamp
EntityC.CtoP (relationship) // Can be used to get "one" EntityP record
I use fetch results controlle...
I'm developing for iPhone iOS 4.0 and I have a list of birthday objects (date + name) stored using Core Data. I want to use the NSFetchedResultsController to retrieve this list sorted by the next birthdate date of each birthday object. For that I need to define my own logic for the sort descriptor.
I tried using:
[NSSortDescriptor sort...
Hi everybody,
I am a novice in Objective-C; and I could not find any solution in my Books or internet.
My question: What are the most efficient and fastest ways to use already compiled .mom and SQLite db without having the source codes?
Details:
I am trying to connect my small app to the database of another application and use (read-in...
Hi all.
Maybe there is a simple solution to this, but I'm getting headache of this, I'm fairly new with all this Core Data stuff:
I have a BankAccount class/entity with an "index" attribute, used for sorting, and a "transactions" to-many relationship to the Transaction class/entity. This Transaction entity has a "date" attribute, that ...
NSDisableScreenUpdates();
[self.productsArrayController setFetchPredicate:predicate];
[self.productsArrayController setSortDescriptors:sortDescriptors];
[self.productsArrayController fetchWithRequest:[self.productsArrayController defaultFetchRequest] merge:YES error:nil];
NSSortDescriptor *lastSortDescriptor = [sortDescriptors lastObj...
Is there a function that compares two objects using an array of NSSortDescriptor and returns the NSComparisonResult? (Putting them in an array will not identify equality.)
...
I have an application which I wrote which used to work perfectly fine. There is new requirement that all data needs to be encrypted now, so I implemented encryption by making all my core data fields type transformable and writing custom transformers for each data type which encrypts/decrypts each element of data as it is written/read fro...
I'm trying to sort an array of people objects. The class looks like this.
Person
-------
name
phone
I have an NSMutableArray filled with these objects. I want to sort this array by the name of each person object.
This is the code I tried.
NSSortDescriptor *desc = [[NSSortDescriptor alloc] initWithKey: @"name" ascending: YES];
[pers...
I am trying to group results returned by Core Data. I read that you need to use "SortDescriptors" with a selector but I cant seem to get it to work?
I am trying to return group'ed "unique" name values?
http://developer.apple.com/library/ios/#documentation/cocoa/Conceptual/SortDescriptors/Concepts/Creating.html
Thanks
James
...
I'm trying to use the NSFetchedResultsController in my app, but have a problem to sort my data. I get the following error when trying to sort the result using a relationship that is two levels down from the entity:
* Terminating app due to uncaught exception
'NSInvalidArgumentException', reason:
'to-many key not allowed here'
M...
I have setup a data model where Student Entity has a name a 1-to-many relationship with Subject. Each Subject that he attends has a number of Class Times.
The code below sorts it, based on the Student name, this is straight forward.
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Student" inManagedObjectContext:...
I am trying to use NSSortDescriptor in Core Data to fetch my records. Array of modal-objects doesn't get affected by sort descriptor. It gives records in same order.Here is my code:
NSManagedObjectContext *moc=[self managedObjectContext];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEnti...
I have two entities. Client and Project. A Client has many Projects, but a Project can only be assigned to one Client. This has been designed with the datamodel.
Client entity has attribute clientName and relationship to-many projects
Project entity has attribute projectName and relationship to-one client
I want to retrieve all Cli...
So, imagine you have a couple of arrays, Colors and Shapes, like this:
Colors: {
Yellow,
Blue,
Red
}
Shapes: {
Square,
Circle,
Diamond
}
Now, if I want to sort Colors into alphabetical order I can do something like this:
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:nil ascending:YES selector:@selector(loc...
I'm using Core Data to cache a decent amount of information, and I have a To-Many relationship set up among my managed objects. Naturally I use an NSFetchRequest to fetch an array of the singular side of that relationship. However, I populate a UITableView using the the "many" side of the relationship, and I'd like it to be sorted alphab...