NSPredicate | Gives bad exception on Entity Fetch Request | Swift 4
I try to get an Entity via an NSPredicate from CoreData model. Initially I insert an entity using its id and now intend to get it. However my code crashes without any further description on specifically my NSPredicate. I have no idea why? My id attribute is Int32:
var employTime:EmployeeTime?
let context = getContext()
let fetchRequest = NSFetchRequest<NSManagedObject>(entityName: "EmployeeTime")
//code crashes on this bottom line
let predicate = NSPredicate(format: "id == %@", id)
fetchRequest.predicate = predicate
let employTimes = try! context.fetch(fetchRequest) as? [EmployeeTime]
if (employTimes?.count)! > 0 {
for et in employTimes! {
if et.id == id {
employTime = et
}
}
} else {
employTime = EmployeeTime(context: context)
}
return employTime!
Any help most greatly appreciated.
swift core-data nspredicate
asked Nov 16 '18 at 5:39
Mohsin Khubaib AhmedMohsin Khubaib Ahmed
7771322
add a comment |
I try to get an Entity via an NSPredicate from CoreData model. Initially I insert an entity using its id and now intend to get it. However my code crashes without any further description on specifically my NSPredicate. I have no idea why? My id attribute is Int32:
var employTime:EmployeeTime?
let context = getContext()
let fetchRequest = NSFetchRequest<NSManagedObject>(entityName: "EmployeeTime")
//code crashes on this bottom line
let predicate = NSPredicate(format: "id == %@", id)
fetchRequest.predicate = predicate
let employTimes = try! context.fetch(fetchRequest) as? [EmployeeTime]
if (employTimes?.count)! > 0 {
for et in employTimes! {
if et.id == id {
employTime = et
}
}
} else {
employTime = EmployeeTime(context: context)
}
return employTime!
Any help most greatly appreciated.
swift core-data nspredicate
asked Nov 16 '18 at 5:39
Mohsin Khubaib AhmedMohsin Khubaib Ahmed
7771322
Possible duplicate of EXC_BAD_ACCESS when building nspredicate
– Larme
Nov 16 '18 at 9:04
add a comment |
I try to get an Entity via an NSPredicate from CoreData model. Initially I insert an entity using its id and now intend to get it. However my code crashes without any further description on specifically my NSPredicate. I have no idea why? My id attribute is Int32:
var employTime:EmployeeTime?
let context = getContext()
let fetchRequest = NSFetchRequest<NSManagedObject>(entityName: "EmployeeTime")
//code crashes on this bottom line
let predicate = NSPredicate(format: "id == %@", id)
fetchRequest.predicate = predicate
let employTimes = try! context.fetch(fetchRequest) as? [EmployeeTime]
if (employTimes?.count)! > 0 {
for et in employTimes! {
if et.id == id {
employTime = et
}
}
} else {
employTime = EmployeeTime(context: context)
}
return employTime!
Any help most greatly appreciated.
swift core-data nspredicate
asked Nov 16 '18 at 5:39
Mohsin Khubaib AhmedMohsin Khubaib Ahmed
7771322
I try to get an Entity via an NSPredicate from CoreData model. Initially I insert an entity using its id and now intend to get it. However my code crashes without any further description on specifically my NSPredicate. I have no idea why? My id attribute is Int32:
var employTime:EmployeeTime?
let context = getContext()
let fetchRequest = NSFetchRequest<NSManagedObject>(entityName: "EmployeeTime")
//code crashes on this bottom line
let predicate = NSPredicate(format: "id == %@", id)
fetchRequest.predicate = predicate
let employTimes = try! context.fetch(fetchRequest) as? [EmployeeTime]
if (employTimes?.count)! > 0 {
for et in employTimes! {
if et.id == id {
employTime = et
}
}
} else {
employTime = EmployeeTime(context: context)
}
return employTime!
Any help most greatly appreciated.
swift core-data nspredicate
swift core-data nspredicate
asked Nov 16 '18 at 5:39
Mohsin Khubaib AhmedMohsin Khubaib Ahmed
7771322
asked Nov 16 '18 at 5:39
Mohsin Khubaib AhmedMohsin Khubaib Ahmed
7771322
asked Nov 16 '18 at 5:39
Mohsin Khubaib AhmedMohsin Khubaib Ahmed
7771322
asked Nov 16 '18 at 5:39
Mohsin Khubaib AhmedMohsin Khubaib Ahmed
7771322
asked Nov 16 '18 at 5:39
Mohsin Khubaib AhmedMohsin Khubaib Ahmed
7771322
7771322
Possible duplicate of EXC_BAD_ACCESS when building nspredicate
– Larme
Nov 16 '18 at 9:04
add a comment |
Possible duplicate of EXC_BAD_ACCESS when building nspredicate
– Larme
Nov 16 '18 at 9:04
Possible duplicate of EXC_BAD_ACCESS when building nspredicate
– Larme
Nov 16 '18 at 9:04
Possible duplicate of EXC_BAD_ACCESS when building nspredicate
– Larme
Nov 16 '18 at 9:04
add a comment |
1 Answer
1
active
oldest
votes
This is a very common mistake.
The placeholder %@ is only for objects, for an Int32 you need %d or %i
let predicate = NSPredicate(format: "id == %d", id)
And create the fetch request with the concrete NSManagedObject subclass
let fetchRequest = NSFetchRequest<EmployeeTime>(entityName: "EmployeeTime")
this avoids the type cast later.
Your entire code can be simplified (no optionals needed):
let employTime:EmployeeTime
let context = getContext()
let fetchRequest = NSFetchRequest<EmployeeTime>(entityName: "EmployeeTime")
let predicate = NSPredicate(format: "id == %d", id)
fetchRequest.predicate = predicate
let employTimes = try! context.fetch(fetchRequest)
if let et = employTimes.first {
employTime = et
} else {
employTime = EmployeeTime(context: context)
}
return employTime
However you should avoid try!. Make your function throw and hand over a potential error to the caller.
answered Nov 16 '18 at 6:00
vadianvadian
154k17165190
Wohoo! Works like a charm :) Thank you for all the tips as well.
– Mohsin Khubaib Ahmed
Nov 16 '18 at 6:12
can you however tell me if predicate should be = or == and what is the difference between them
– Mohsin Khubaib Ahmed
Nov 16 '18 at 6:17
1
There is no difference, please see developer.apple.com/library/archive/documentation/Cocoa/…
– vadian
Nov 16 '18 at 7:46
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
This is a very common mistake.
The placeholder %@ is only for objects, for an Int32 you need %d or %i
let predicate = NSPredicate(format: "id == %d", id)
And create the fetch request with the concrete NSManagedObject subclass
let fetchRequest = NSFetchRequest<EmployeeTime>(entityName: "EmployeeTime")
this avoids the type cast later.
Your entire code can be simplified (no optionals needed):
let employTime:EmployeeTime
let context = getContext()
let fetchRequest = NSFetchRequest<EmployeeTime>(entityName: "EmployeeTime")
let predicate = NSPredicate(format: "id == %d", id)
fetchRequest.predicate = predicate
let employTimes = try! context.fetch(fetchRequest)
if let et = employTimes.first {
employTime = et
} else {
employTime = EmployeeTime(context: context)
}
return employTime
However you should avoid try!. Make your function throw and hand over a potential error to the caller.
answered Nov 16 '18 at 6:00
vadianvadian
154k17165190
Wohoo! Works like a charm :) Thank you for all the tips as well.
– Mohsin Khubaib Ahmed
Nov 16 '18 at 6:12
can you however tell me if predicate should be = or == and what is the difference between them
– Mohsin Khubaib Ahmed
Nov 16 '18 at 6:17
1
There is no difference, please see developer.apple.com/library/archive/documentation/Cocoa/…
– vadian
Nov 16 '18 at 7:46
add a comment |
This is a very common mistake.
The placeholder %@ is only for objects, for an Int32 you need %d or %i
let predicate = NSPredicate(format: "id == %d", id)
And create the fetch request with the concrete NSManagedObject subclass
let fetchRequest = NSFetchRequest<EmployeeTime>(entityName: "EmployeeTime")
this avoids the type cast later.
Your entire code can be simplified (no optionals needed):
let employTime:EmployeeTime
let context = getContext()
let fetchRequest = NSFetchRequest<EmployeeTime>(entityName: "EmployeeTime")
let predicate = NSPredicate(format: "id == %d", id)
fetchRequest.predicate = predicate
let employTimes = try! context.fetch(fetchRequest)
if let et = employTimes.first {
employTime = et
} else {
employTime = EmployeeTime(context: context)
}
return employTime
However you should avoid try!. Make your function throw and hand over a potential error to the caller.
answered Nov 16 '18 at 6:00
vadianvadian
154k17165190
Wohoo! Works like a charm :) Thank you for all the tips as well.
– Mohsin Khubaib Ahmed
Nov 16 '18 at 6:12
can you however tell me if predicate should be = or == and what is the difference between them
– Mohsin Khubaib Ahmed
Nov 16 '18 at 6:17
1
There is no difference, please see developer.apple.com/library/archive/documentation/Cocoa/…
– vadian
Nov 16 '18 at 7:46
add a comment |
This is a very common mistake.
The placeholder %@ is only for objects, for an Int32 you need %d or %i
let predicate = NSPredicate(format: "id == %d", id)
And create the fetch request with the concrete NSManagedObject subclass
let fetchRequest = NSFetchRequest<EmployeeTime>(entityName: "EmployeeTime")
this avoids the type cast later.
Your entire code can be simplified (no optionals needed):
let employTime:EmployeeTime
let context = getContext()
let fetchRequest = NSFetchRequest<EmployeeTime>(entityName: "EmployeeTime")
let predicate = NSPredicate(format: "id == %d", id)
fetchRequest.predicate = predicate
let employTimes = try! context.fetch(fetchRequest)
if let et = employTimes.first {
employTime = et
} else {
employTime = EmployeeTime(context: context)
}
return employTime
However you should avoid try!. Make your function throw and hand over a potential error to the caller.
answered Nov 16 '18 at 6:00
vadianvadian
154k17165190
This is a very common mistake.
The placeholder %@ is only for objects, for an Int32 you need %d or %i
let predicate = NSPredicate(format: "id == %d", id)
And create the fetch request with the concrete NSManagedObject subclass
let fetchRequest = NSFetchRequest<EmployeeTime>(entityName: "EmployeeTime")
this avoids the type cast later.
Your entire code can be simplified (no optionals needed):
let employTime:EmployeeTime
let context = getContext()
let fetchRequest = NSFetchRequest<EmployeeTime>(entityName: "EmployeeTime")
let predicate = NSPredicate(format: "id == %d", id)
fetchRequest.predicate = predicate
let employTimes = try! context.fetch(fetchRequest)
if let et = employTimes.first {
employTime = et
} else {
employTime = EmployeeTime(context: context)
}
return employTime
However you should avoid try!. Make your function throw and hand over a potential error to the caller.
answered Nov 16 '18 at 6:00
vadianvadian
154k17165190
edited Nov 16 '18 at 6:06
answered Nov 16 '18 at 6:00
vadianvadian
154k17165190
answered Nov 16 '18 at 6:00
vadianvadian
154k17165190
answered Nov 16 '18 at 6:00
vadianvadian
154k17165190
154k17165190
Wohoo! Works like a charm :) Thank you for all the tips as well.
– Mohsin Khubaib Ahmed
Nov 16 '18 at 6:12
can you however tell me if predicate should be = or == and what is the difference between them
– Mohsin Khubaib Ahmed
Nov 16 '18 at 6:17
1
There is no difference, please see developer.apple.com/library/archive/documentation/Cocoa/…
– vadian
Nov 16 '18 at 7:46
add a comment |
Wohoo! Works like a charm :) Thank you for all the tips as well.
– Mohsin Khubaib Ahmed
Nov 16 '18 at 6:12
can you however tell me if predicate should be = or == and what is the difference between them
– Mohsin Khubaib Ahmed
Nov 16 '18 at 6:17
1
There is no difference, please see developer.apple.com/library/archive/documentation/Cocoa/…
– vadian
Nov 16 '18 at 7:46
Wohoo! Works like a charm :) Thank you for all the tips as well.
– Mohsin Khubaib Ahmed
Nov 16 '18 at 6:12
Wohoo! Works like a charm :) Thank you for all the tips as well.
– Mohsin Khubaib Ahmed
Nov 16 '18 at 6:12
can you however tell me if predicate should be = or == and what is the difference between them
– Mohsin Khubaib Ahmed
Nov 16 '18 at 6:17
can you however tell me if predicate should be = or == and what is the difference between them
– Mohsin Khubaib Ahmed
Nov 16 '18 at 6:17
1
1
There is no difference, please see developer.apple.com/library/archive/documentation/Cocoa/…
– vadian
Nov 16 '18 at 7:46
There is no difference, please see developer.apple.com/library/archive/documentation/Cocoa/…
– vadian
Nov 16 '18 at 7:46
add a comment |
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Possible duplicate of EXC_BAD_ACCESS when building nspredicate
– Larme
Nov 16 '18 at 9:04