Optimizing Core Data Fetch Requests in Objective-C for CI/CD Pipeline Efficiency
I'm working on a project and hit a roadblock. I'm converting an old project and I'm sure I'm missing something obvious here, but Currently developing a CI/CD pipeline for an iOS application that heavily relies on Core Data for managing a complex database..... As part of optimizing our deployment process, I'm focusing on refining our fetch requests to ensure they perform efficiently during automated testing. I've noticed that some fetch requests take significantly longer than others, particularly when dealing with large datasets. For instance, this fetch request: ```objective-c NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"EntityName"]; fetchRequest.predicate = [NSPredicate predicateWithFormat:@"attribute == %@", value]; fetchRequest.fetchLimit = 100; NSError *error = nil; NSArray *results = [context executeFetchRequest:fetchRequest error:&error]; if (error) { NSLog(@"Error fetching data: %@", error); } ``` is taking longer than expected, especially when running multiple tests in parallel. After profiling the application, I discovered that certain predicates are causing unnecessary overhead. As a test, I switched to using `NSFetchedResultsController`, but it seemed to complicate my CI setup due to its reliance on delegate methods, which aren't always triggered in a testing environment. I've started experimenting with batching the fetch results, but the trade-off seems to be an increase in complexity and a need for more memory. Would caching some of the data with `NSCache` help in reducing the load times during tests? How can I implement this while maintaining the integrity of the data flow? Debugging sessions revealed that our fetch requests are also impacted by the underlying SQLite configuration. Is there a recommended way to optimize the SQLite settings for better performance under CI conditions? Any guidance on best practices or examples showcasing efficient fetch requests in a CI/CD context would be greatly appreciated. This is part of a larger CLI tool I'm building. The stack includes Objective-C and several other technologies. Thanks in advance! I'm using Objective-C 3.9 in this project. I appreciate any insights! The stack includes Objective-C and several other technologies. Any pointers in the right direction? Is there a simpler solution I'm overlooking?