CODEWITHSUNDEEP
swiftcore-datansdatenspredicate
Nils
Nils

Reputation: 313

Extract entity from last seven days core data

I am currently working with core data to store meals. My entities are date (Date), foods (string) and drinks (string). Now I want to extract all the foods stored for the last seven days. How would I do this? I know i should somehow use NSPredicate, but I can't figure out how exactly.

Upvotes: 3

Views: 871

Answers (1)

vadian
vadian

Reputation: 285290

Get the current calendar

let calendar = NSCalendar.currentCalendar()

Get the current date

let now = NSDate()

Subtract 7 days from current date

let sevenDaysAgo = calendar.dateByAddingUnit(.Day, value: -7, toDate: now, options: [])!

Get the start of the day 7 days ago

let startDate = calendar.startOfDayForDate(sevenDaysAgo)

Create the predicate, literal date is the Core Data attribute

let predicate = NSPredicate(format:"(date >= %@) AND (date < %@)", startDate, now)

Upvotes: 4

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