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Swift Core Data NSPredicate static string issue

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.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;

0

I would like to make predicate more flexible for changes. I have lot of such strings in the sources code:

let predicate = NSPredicate(format: "bodyPart.name = %@", name)

let filteredExercises = ExerciseEntity.mr_findAll(with: predicate)

but as you see if I will change BodyPart name to MuscleGroup for example someday it will cause issue like:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'keypath bodyPart.name not found in entity <NSSQLEntity ExerciseEntity id=5>'

I am searching for the solution with a key paths like

let predicate = NSPredicate(format: "%@ = %@", BodyPart.name, name)

ios swift core-data nspredicate

share|improve this question

asked Mar 27 at 20:38

Matrosov AlexanderMatrosov Alexander

9,3493939 gold badges120120 silver badges234234 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Compare stackoverflow.com/a/41638253/1187415.
  
  – Martin R
  Mar 27 at 20:55
  

  
  
  
  

add a comment | 

0

I would like to make predicate more flexible for changes. I have lot of such strings in the sources code:

let predicate = NSPredicate(format: "bodyPart.name = %@", name)

let filteredExercises = ExerciseEntity.mr_findAll(with: predicate)

but as you see if I will change BodyPart name to MuscleGroup for example someday it will cause issue like:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'keypath bodyPart.name not found in entity <NSSQLEntity ExerciseEntity id=5>'

I am searching for the solution with a key paths like

let predicate = NSPredicate(format: "%@ = %@", BodyPart.name, name)

ios swift core-data nspredicate

share|improve this question

asked Mar 27 at 20:38

Matrosov AlexanderMatrosov Alexander

9,3493939 gold badges120120 silver badges234234 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Compare stackoverflow.com/a/41638253/1187415.
  
  – Martin R
  Mar 27 at 20:55
  

  
  
  
  

add a comment | 

I would like to make predicate more flexible for changes. I have lot of such strings in the sources code:

let predicate = NSPredicate(format: "bodyPart.name = %@", name)

let filteredExercises = ExerciseEntity.mr_findAll(with: predicate)

but as you see if I will change BodyPart name to MuscleGroup for example someday it will cause issue like:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'keypath bodyPart.name not found in entity <NSSQLEntity ExerciseEntity id=5>'

I am searching for the solution with a key paths like

let predicate = NSPredicate(format: "%@ = %@", BodyPart.name, name)

ios swift core-data nspredicate

share|improve this question

asked Mar 27 at 20:38

Matrosov AlexanderMatrosov Alexander

9,3493939 gold badges120120 silver badges234234 bronze badges

let predicate = NSPredicate(format: "bodyPart.name = %@", name)

let filteredExercises = ExerciseEntity.mr_findAll(with: predicate)

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'keypath bodyPart.name not found in entity <NSSQLEntity ExerciseEntity id=5>'

let predicate = NSPredicate(format: "%@ = %@", BodyPart.name, name)

share|improve this question

asked Mar 27 at 20:38

Matrosov AlexanderMatrosov Alexander

9,3493939 gold badges120120 silver badges234234 bronze badges

share|improve this question

asked Mar 27 at 20:38

Matrosov AlexanderMatrosov Alexander

9,3493939 gold badges120120 silver badges234234 bronze badges

asked Mar 27 at 20:38

Matrosov AlexanderMatrosov Alexander

9,3493939 gold badges120120 silver badges234234 bronze badges

asked Mar 27 at 20:38

Matrosov AlexanderMatrosov Alexander

9,3493939 gold badges120120 silver badges234234 bronze badges

1 Answer
1

active

oldest

votes

2

Use %K to substitute the key path

let predicate = NSPredicate(format: "%K = %@", #keyPath(BodyPart.name), name)

share|improve this answer

edited Mar 27 at 20:55

answered Mar 27 at 20:45

Joakim DanielsonJoakim Danielson

14.7k33 gold badges88 silver badges2727 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It should be #keyPath(BodyPart.name), compare stackoverflow.com/a/41638253/1187415
  
  – Martin R
  Mar 27 at 20:53
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks for the reminder about #keyPath
  
  – Joakim Danielson
  Mar 27 at 20:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  thanks for comments
  
  – Matrosov Alexander
  Mar 27 at 21:18
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  it will just return "name == some name" but I need "bodyPart.name", for sure I can combine to strings I guess) thanks good solution!
  
  – Matrosov Alexander
  Mar 27 at 21:20
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @MatrosovAlexander, shouldn't it be like Martin R suggests above #keyPath(ExerciseEntity.muscle.name)?
  
  – Joakim Danielson
  Mar 27 at 21:28
  

  
  
  
  

 | 
show 4 more comments

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2

Use %K to substitute the key path

let predicate = NSPredicate(format: "%K = %@", #keyPath(BodyPart.name), name)

share|improve this answer

edited Mar 27 at 20:55

answered Mar 27 at 20:45

Joakim DanielsonJoakim Danielson

14.7k33 gold badges88 silver badges2727 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It should be #keyPath(BodyPart.name), compare stackoverflow.com/a/41638253/1187415
  
  – Martin R
  Mar 27 at 20:53
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks for the reminder about #keyPath
  
  – Joakim Danielson
  Mar 27 at 20:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  thanks for comments
  
  – Matrosov Alexander
  Mar 27 at 21:18
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  it will just return "name == some name" but I need "bodyPart.name", for sure I can combine to strings I guess) thanks good solution!
  
  – Matrosov Alexander
  Mar 27 at 21:20
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @MatrosovAlexander, shouldn't it be like Martin R suggests above #keyPath(ExerciseEntity.muscle.name)?
  
  – Joakim Danielson
  Mar 27 at 21:28
  

  
  
  
  

 | 
show 4 more comments

2

Use %K to substitute the key path

let predicate = NSPredicate(format: "%K = %@", #keyPath(BodyPart.name), name)

share|improve this answer

edited Mar 27 at 20:55

answered Mar 27 at 20:45

Joakim DanielsonJoakim Danielson

14.7k33 gold badges88 silver badges2727 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It should be #keyPath(BodyPart.name), compare stackoverflow.com/a/41638253/1187415
  
  – Martin R
  Mar 27 at 20:53
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks for the reminder about #keyPath
  
  – Joakim Danielson
  Mar 27 at 20:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  thanks for comments
  
  – Matrosov Alexander
  Mar 27 at 21:18
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  it will just return "name == some name" but I need "bodyPart.name", for sure I can combine to strings I guess) thanks good solution!
  
  – Matrosov Alexander
  Mar 27 at 21:20
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @MatrosovAlexander, shouldn't it be like Martin R suggests above #keyPath(ExerciseEntity.muscle.name)?
  
  – Joakim Danielson
  Mar 27 at 21:28
  

  
  
  
  

 | 
show 4 more comments

Use %K to substitute the key path

let predicate = NSPredicate(format: "%K = %@", #keyPath(BodyPart.name), name)

share|improve this answer

edited Mar 27 at 20:55

answered Mar 27 at 20:45

Joakim DanielsonJoakim Danielson

14.7k33 gold badges88 silver badges2727 bronze badges

let predicate = NSPredicate(format: "%K = %@", #keyPath(BodyPart.name), name)

share|improve this answer

edited Mar 27 at 20:55

answered Mar 27 at 20:45

Joakim DanielsonJoakim Danielson

14.7k33 gold badges88 silver badges2727 bronze badges

answered Mar 27 at 20:45

Joakim DanielsonJoakim Danielson

14.7k33 gold badges88 silver badges2727 bronze badges

answered Mar 27 at 20:45

Joakim DanielsonJoakim Danielson

14.7k33 gold badges88 silver badges2727 bronze badges