core data - NSBatchDeleteRequest with NSPredicate in swift -


how delete rows coredata using nsbatchdeleterequest nspredicate.

i want delete records older 30 days.

i dont want data in memory , compare , delete, want use nsbatchdeleterequest, in nsbatchupdaterequest.

here code far have written

let date = nsdate(); let yesterday = date.datebyaddingtimeinterval(-24*60*60); let predicate = nspredicate(format: "date > %@", yesterday);     let fetchrequest = nsfetchrequest(entityname: "notification");     let batchdelete = nsbatchdeleterequest(fetchrequest: fetchrequest)

please give answers in swift

this simple example. possible rich using of nspredicate filter request.

let calendar = nscalendar.currentcalendar()  let thirtydaysago = calendar.datebyaddingunit(.day, value: -30, todate: nsdate(), options: [])   let fetchrequest = nsfetchrequest(entityname: "notification")  fetchrequest.predicate = nspredicate(format: "(date >= %@)", thirtydaysago)  let deleterequest = nsbatchdeleterequest(fetchrequest: fetchrequest)  {   try context.executerequest(deleterequest)   try context.save() } catch {   print (error) }

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