Delete all items in a for each loop?

Question

I have a fetch request, and a foreach loop listing out the items. How can I write a function to delete all items in this set?

@FetchRequest(
    entity: TaskItem.entity(),
    sortDescriptors: [NSSortDescriptor(keyPath: \TaskItem.completedDate, ascending: false)],
    predicate: NSPredicate(format: "isComplete == %@", NSNumber(value: true))
) var taskItems: FetchedResults<TaskItem>

ForEach(taskItems, id: \.self) { item in
    Text("\(item.title)")
}

I have this function to delete individual items. Can this code be tweaked and used to delete all items?

func deleteTask(indexSet: IndexSet) {
    let source = indexSet.first!
    let taskItem = taskItems[source]
    managedObjectContext.delete(taskItem)
    saveTasks()
}

What _all_ elements? All in the set or all objects that you have fetched? Either way you should look at [this question](https://stackoverflow.com/questions/14560900/coredata-delete-multiple-objects) — Joakim Danielson, Jul 06 '20 at 20:55

pawello2222 · Answer 1 · 2020-07-07T08:14:57.187

2

Try the following:

func deleteAll() {
    // for each taskItem... delete
    taskItems.forEach(managedObjectContext.delete)
    saveTasks()
}

Assuming saveTasks saves the managedObjectContext object.

edited Jul 07 '20 at 08:14

answered Jul 06 '20 at 20:20

pawello2222

46,897
22
145
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score 2 · Accepted Answer · answered Jul 06 '20 at 20:21

2

Loop over taskItems and delete taskItem one-by-one:

func deleteAllTasks() {
    for taskItem in taskItems {
        managedObjectContext.delete(taskItem)
    }
    saveTasks()
}

answered Jul 06 '20 at 20:21

Frankenstein

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Delete all items in a for each loop?

2 Answers2