Hi everyone! In the stater pack application appdelegate.swift file author using that function
func importJSONSeedDataIfNeeded() {
let fetchRequest = NSFetchRequest(entityName: “Venue”)
let count = try! coreDataStack.managedContext.count(for: fetchRequest)
guard count == 0 else { return }
do {
let results = try coreDataStack.managedContext.fetch(fetchRequest)
results.forEach({ coreDataStack.managedContext.delete($0) })
coreDataStack.saveContext()
importJSONSeedData()
} catch let error as NSError {
print("Error fetching: \(error), \(error.userInfo)")
}
} PLEASE answer to me anyone why author employing those lines???
let results = try coreDataStack.managedContext.fetch(fetchRequest)
results.forEach({ coreDataStack.managedContext.delete($0) })
Aren’t they extra? Thanks for everyone who responds =))
@simons1994 Thanks very much for your question! I honestly don’t think the lines you’ve pointed out are redundant or “extra”. Outside of the do/catch block, you’re declaring WHAT the fetchRequest is, and then inside the do/catch block, you actually PERFORM the fetchRequest, and do whatever work you want to do with the results that are returned. I hope this makes sense
Thanks for your answer! Im really appreciated time you’ve spent to read and answer my question)
But my question is not about what is it goin’ during the method, my question is about why do we delete results fetched from context WHEN count == 0? isn’t there’s already nothing to delete? why author doing it when count == 0 ???
