I'm building an iOS app for test-taking and I want to be sure of my model before proceeding. I found this post very helpful and tried to implement a simplified version for Core Data. Here are some of my assumptions: Each User can take multiple testsEach User has one set of answers per Test taken Each Test has one UserEach Question has many answers  Here is my Core Data model:Overall, what do you think of my database schema? Is it sufficient to handle a simple test-taking app? Also, are Test_Questions and User_Answers necessary? I could, in theory, have a relationship directly between Test andQuestion? Test -->> Question. I would like to know which is better.  Here are my model headers for Test_Questions and User_Answers:Test_Questions.h@class Question, Test;@interface Test_Questions : NSManagedObject@property (nonatomic, retain) Test *test;@property (nonatomic, retain) NSSet *questions;@end@interface Test_Questions (CoreDataGeneratedAccessors)- (void)addQuestionsObject:(Question *)value;- (void)removeQuestionsObject:(Question *)value;- (void)addQuestions:(NSSet *)values;- (void)removeQuestions:(NSSet *)values;@endUser_Answers.h@class Answer, User;@interface User_Answers : NSManagedObject@property (nonatomic, retain) User *user;@property (nonatomic, retain) NSSet *userAnswersSet;@end@interface User_Answers (CoreDataGeneratedAccessors)- (void)addUserAnswersSetObject:(Answer *)value;- (void)removeUserAnswersSetObject:(Answer *)value;- (void)addUserAnswersSet:(NSSet *)values;- (void)removeUserAnswersSet:(NSSet *)values;@end
Core Data model for test-taking iOS app
objective c;database;ios;core data