How to sort array of objects by Date

Question

I have a Core Data item called an expense, which has different properties such as

expense.name
expense.amount

and also

expense.modificationDate

I have an array, which is of type expenses, and I want to sort the array. I have tried this so far

  monthlyExpenses.sort(by: { $0.modificationDate?.compare($1.modificationDate! as Date) == .orderedAscending })

but it doesn't seem to work. How can I get this to work?

Why not sorting the data before the fetch? It has better optimization. — Larme
– Larme, Commented Dec 21, 2017 at 15:40

rmaddy · Accepted Answer · 2017-12-21 15:48:33Z

2

monthlyExpense.sorted({ $0.modificationDate> $1.modificationDate})

It will sort by ascending and for descending use <.

edited Dec 21, 2017 at 15:48

rmaddy

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answered Dec 21, 2017 at 15:43

Hardik Shah

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3 Comments

Leo Dabus Over a year ago

just make sure to include a space between modificationDate and the operator >.

A. G Over a year ago

Tells me that i cant use a binary operator on 2 NSDate operands

Hardik Shah Over a year ago

@A.G I think you should use Date() not NSDate

Igor Kuznetsov · Accepted Answer · 2017-12-21 15:43:17Z

1

  let fetchRequest = NSFetchRequest<Expenses>(entityName: "Expenses")
let sort = NSSortDescriptor(key: #keyPath(Expenses.date), ascending: true)
fetchRequest.sortDescriptors = [sort]
do {
   expenses = try context.fetch(fetchRequest)
} catch {
    print("Cannot fetch Expenses")
}

Answer was here

answered Dec 21, 2017 at 15:43

Igor Kuznetsov

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Comments

dotkomm · Accepted Answer · 2017-12-21 15:44:52Z

0

Use NSSortDescriptors during your fetch. as Example:

let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "expense")
let sortDescriptor = NSSortDescriptor(key: "modificationDate", ascending: true)


  fetchRequest.sortDescriptors = [sortDescriptor]

  return fetchRequest

answered Dec 21, 2017 at 15:44

dotkomm

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