How is maximum count for a Core Data relationship enforced?
I have a User entity that has a to-many relationship to Location entities. I have it set the relationship to be ordered with a maxCount of 50. When I create new Location entities and set them to users, does Core Data automatically delete the old entities. Do I have to check if the new size will be greater than 50 and manually delete the old Location entity so I don't have a dangling object that I don't need anymore. I have the delete rule set to Cascade.
The description of NSRelationshipDescription.maxCount is just The maximum count of the receiver. and I don't see anything describing how minCount/maxCount works.
Any insight to the behavior of this is appreciated. Thanks!
ios objective-c swift core-data
asked Nov 19 '18 at 4:16
Dhananjay SureshDhananjay Suresh
35111
add a comment |
I have a User entity that has a to-many relationship to Location entities. I have it set the relationship to be ordered with a maxCount of 50. When I create new Location entities and set them to users, does Core Data automatically delete the old entities. Do I have to check if the new size will be greater than 50 and manually delete the old Location entity so I don't have a dangling object that I don't need anymore. I have the delete rule set to Cascade.
The description of NSRelationshipDescription.maxCount is just The maximum count of the receiver. and I don't see anything describing how minCount/maxCount works.
Any insight to the behavior of this is appreciated. Thanks!
ios objective-c swift core-data
asked Nov 19 '18 at 4:16
Dhananjay SureshDhananjay Suresh
35111
add a comment |
I have a User entity that has a to-many relationship to Location entities. I have it set the relationship to be ordered with a maxCount of 50. When I create new Location entities and set them to users, does Core Data automatically delete the old entities. Do I have to check if the new size will be greater than 50 and manually delete the old Location entity so I don't have a dangling object that I don't need anymore. I have the delete rule set to Cascade.
The description of NSRelationshipDescription.maxCount is just The maximum count of the receiver. and I don't see anything describing how minCount/maxCount works.
Any insight to the behavior of this is appreciated. Thanks!
ios objective-c swift core-data
asked Nov 19 '18 at 4:16
Dhananjay SureshDhananjay Suresh
35111
I have a User entity that has a to-many relationship to Location entities. I have it set the relationship to be ordered with a maxCount of 50. When I create new Location entities and set them to users, does Core Data automatically delete the old entities. Do I have to check if the new size will be greater than 50 and manually delete the old Location entity so I don't have a dangling object that I don't need anymore. I have the delete rule set to Cascade.
The description of NSRelationshipDescription.maxCount is just The maximum count of the receiver. and I don't see anything describing how minCount/maxCount works.
Any insight to the behavior of this is appreciated. Thanks!
ios objective-c swift core-data
ios objective-c swift core-data
asked Nov 19 '18 at 4:16
Dhananjay SureshDhananjay Suresh
35111
asked Nov 19 '18 at 4:16
Dhananjay SureshDhananjay Suresh
35111
asked Nov 19 '18 at 4:16
Dhananjay SureshDhananjay Suresh
35111
asked Nov 19 '18 at 4:16
Dhananjay SureshDhananjay Suresh
35111
asked Nov 19 '18 at 4:16
Dhananjay SureshDhananjay Suresh
35111
35111
add a comment |
add a comment |
1 Answer
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CoreData will not automatically delete anything, it will just fail to save the context if the current state is breaking the maxCount rule.
So it is up to you to decide what needs to be deleted and clean up before trying to save.
answered Nov 19 '18 at 6:35
trappertrapper
7,33452463
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1 Answer
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1 Answer
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active
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CoreData will not automatically delete anything, it will just fail to save the context if the current state is breaking the maxCount rule.
So it is up to you to decide what needs to be deleted and clean up before trying to save.
answered Nov 19 '18 at 6:35
trappertrapper
7,33452463
add a comment |
CoreData will not automatically delete anything, it will just fail to save the context if the current state is breaking the maxCount rule.
So it is up to you to decide what needs to be deleted and clean up before trying to save.
answered Nov 19 '18 at 6:35
trappertrapper
7,33452463
add a comment |
CoreData will not automatically delete anything, it will just fail to save the context if the current state is breaking the maxCount rule.
So it is up to you to decide what needs to be deleted and clean up before trying to save.
answered Nov 19 '18 at 6:35
trappertrapper
7,33452463
CoreData will not automatically delete anything, it will just fail to save the context if the current state is breaking the maxCount rule.
So it is up to you to decide what needs to be deleted and clean up before trying to save.
answered Nov 19 '18 at 6:35
trappertrapper
7,33452463
answered Nov 19 '18 at 6:35
trappertrapper
7,33452463
answered Nov 19 '18 at 6:35
trappertrapper
7,33452463
answered Nov 19 '18 at 6:35
trappertrapper
7,33452463
7,33452463
add a comment |
add a comment |
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