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0

I have a TableView. By tapping an entry in this table, another view opens in which that entry is editable.

What's the proper way to handle this? I am aware that I can fetch entries from Core Data via predicates like this:

func fetchEntriesStartingWith(startingDate:Date) -> [FuelEntry] 

 let fetchRequest =
 NSFetchRequest<NSManagedObject>(entityName: "FuelEntry")
 fetchRequest.predicate = NSPredicate(format: "date >= %@", startingDate as CVarArg)

 let sort = NSSortDescriptor(key: #keyPath(FuelEntry.date), ascending: false)
 fetchRequest.sortDescriptors = [sort]

 do 
 return try (CoreDataHandler.managedContext.fetch(fetchRequest) as? [FuelEntry] ?? [FuelEntry]())
 catch let error as NSError 
 print("Could not fetch. (error), (error.userInfo)")
 return []
 

However, this seems error prone: What if I have two entries with the exact same values (might happen in my application) and thus, the NSFetchRequest returns two entries?

Obviously, those two entries will have different IDs, but I'm unsure how to work with those and infer which entry will correspond to what indexPath.

core-data swift4

share|improve this question

asked Mar 22 at 17:37

FangFang

1,02621531

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Don't fetch. Get the item at index (path) from the data source array. By the way you can get rid of this cumbersome syntax as? [FuelEntry] ?? [FuelEntry]()) with a specific fetch request let fetchRequest = NSFetchRequest<FuelEntry>(entityName: "FuelEntry")
  
  – vadian
  Mar 22 at 17:44
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @vadian Thank you, I should have thought of this.
  
  – Fang
  Mar 22 at 17:48
  

  
  
  
  

add a comment | 

0

I have a TableView. By tapping an entry in this table, another view opens in which that entry is editable.

What's the proper way to handle this? I am aware that I can fetch entries from Core Data via predicates like this:

func fetchEntriesStartingWith(startingDate:Date) -> [FuelEntry] 

 let fetchRequest =
 NSFetchRequest<NSManagedObject>(entityName: "FuelEntry")
 fetchRequest.predicate = NSPredicate(format: "date >= %@", startingDate as CVarArg)

 let sort = NSSortDescriptor(key: #keyPath(FuelEntry.date), ascending: false)
 fetchRequest.sortDescriptors = [sort]

 do 
 return try (CoreDataHandler.managedContext.fetch(fetchRequest) as? [FuelEntry] ?? [FuelEntry]())
 catch let error as NSError 
 print("Could not fetch. (error), (error.userInfo)")
 return []
 

However, this seems error prone: What if I have two entries with the exact same values (might happen in my application) and thus, the NSFetchRequest returns two entries?

Obviously, those two entries will have different IDs, but I'm unsure how to work with those and infer which entry will correspond to what indexPath.

core-data swift4

share|improve this question

asked Mar 22 at 17:37

FangFang

1,02621531

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Don't fetch. Get the item at index (path) from the data source array. By the way you can get rid of this cumbersome syntax as? [FuelEntry] ?? [FuelEntry]()) with a specific fetch request let fetchRequest = NSFetchRequest<FuelEntry>(entityName: "FuelEntry")
  
  – vadian
  Mar 22 at 17:44
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @vadian Thank you, I should have thought of this.
  
  – Fang
  Mar 22 at 17:48
  

  
  
  
  

add a comment | 

I have a TableView. By tapping an entry in this table, another view opens in which that entry is editable.

What's the proper way to handle this? I am aware that I can fetch entries from Core Data via predicates like this:

func fetchEntriesStartingWith(startingDate:Date) -> [FuelEntry] 

 let fetchRequest =
 NSFetchRequest<NSManagedObject>(entityName: "FuelEntry")
 fetchRequest.predicate = NSPredicate(format: "date >= %@", startingDate as CVarArg)

 let sort = NSSortDescriptor(key: #keyPath(FuelEntry.date), ascending: false)
 fetchRequest.sortDescriptors = [sort]

 do 
 return try (CoreDataHandler.managedContext.fetch(fetchRequest) as? [FuelEntry] ?? [FuelEntry]())
 catch let error as NSError 
 print("Could not fetch. (error), (error.userInfo)")
 return []
 

However, this seems error prone: What if I have two entries with the exact same values (might happen in my application) and thus, the NSFetchRequest returns two entries?

Obviously, those two entries will have different IDs, but I'm unsure how to work with those and infer which entry will correspond to what indexPath.

core-data swift4

share|improve this question

asked Mar 22 at 17:37

FangFang

1,02621531

func fetchEntriesStartingWith(startingDate:Date) -> [FuelEntry] 

 let fetchRequest =
 NSFetchRequest<NSManagedObject>(entityName: "FuelEntry")
 fetchRequest.predicate = NSPredicate(format: "date >= %@", startingDate as CVarArg)

 let sort = NSSortDescriptor(key: #keyPath(FuelEntry.date), ascending: false)
 fetchRequest.sortDescriptors = [sort]

 do 
 return try (CoreDataHandler.managedContext.fetch(fetchRequest) as? [FuelEntry] ?? [FuelEntry]())
 catch let error as NSError 
 print("Could not fetch. (error), (error.userInfo)")
 return []
 

share|improve this question

asked Mar 22 at 17:37

FangFang

1,02621531

share|improve this question

asked Mar 22 at 17:37

FangFang

1,02621531

asked Mar 22 at 17:37

FangFang

1,02621531

asked Mar 22 at 17:37

FangFang

1,02621531