2014/10/15 下午 10:08:22

iphone Programming Glossary: entityb

What's better way to build NSPredicate with to-many deep relationships?

http://stackoverflow.com/questions/2006927/whats-better-way-to-build-nspredicate-with-to-many-deep-relationships

better way to build NSPredicate with to many deep relationships I have three entities EntityA EntityB and EntityC connected with to many relationships. See schema for details For getting all instance of EntityA which depend.. connected with to many relationships. See schema for details For getting all instance of EntityA which depend from EntityB.name I use the predicate like this NSPredicate predicate NSPredicate predicateWithFormat @ ANY EntityB.name like 'SomeName'.. depend from EntityB.name I use the predicate like this NSPredicate predicate NSPredicate predicateWithFormat @ ANY EntityB.name like 'SomeName' What should be predicate for getting all instance of EntityA which depend from EntityC.name I tried..

Core Data Many-to-Many Relationship NSPredicate

http://stackoverflow.com/questions/2822625/core-data-many-to-many-relationship-nspredicate

Data Many to Many Relationship NSPredicate I have a data model with a many to many relationship like EntityA EntityB EntityC . I used to query EntityA with different search criteria and I use NSCompoundPredicate with an array of NSPredicate.. tried to use the following SUBQUERY but it did not work. searchPredicate NSPredicate predicateWithFormat @ 0 SUBQUERY EntityB B 0 SUBQUERY B.EntityC EntityC EntityC.name like @ .@count .@count name And I got the following exception Terminating app.. take this with a grain of salt. I think your making this overly complicated. You should simplify with keypaths. Each EntityB has a to one relationship to a EntityC so to search on EntityB objects all you need to do is check EntityB.entityCRelationshipName.entityCAttribute..

Where can I find a good example of a Core Data to-many relationship?

http://stackoverflow.com/questions/5399195/where-can-i-find-a-good-example-of-a-core-data-to-many-relationship

as a set while the other represents it as a single object. Take the following entities EntityA name string bees EntityB.a EntityB name string a EntityA.bees In EntityA the relationship bees is a set because there maybe many EntityB objects.. a set while the other represents it as a single object. Take the following entities EntityA name string bees EntityB.a EntityB name string a EntityA.bees In EntityA the relationship bees is a set because there maybe many EntityB objects in the relationship... bees EntityB.a EntityB name string a EntityA.bees In EntityA the relationship bees is a set because there maybe many EntityB objects in the relationship. So using Key Value coding you would have to access the relationship using a mutableSetForKey..