CODEWITHSUNDEEP
iosobjective-ccore-data
mikezs
mikezs

Reputation: 422

get values before today by predicate

I have a Word of a Day app. I store the date of the word with NSSTRING and all is working fine. But when i want to show all words in the database, which date is less than [NSDate date] - which means today, it doesn't sort it well. I'm using NSpredicate to do that. How to make it work? 

NSPredicate *predicate = [NSPredicate predicateWithFormat:
                              @"date <= %@", [NSDate date]];
    [fetchRequest setPredicate:predicate];

Even when i put the string from current date, it doesn't work. I mean the comparison is only work for current month, because the format is : 11.06.2014

Upvotes: 0

Views: 69

Answers (1)

Vladimir
Vladimir

Reputation: 170839

The best solution would be to store your date as NSDate or a timestamp in database and convert it to NSString only for display.

If you cannot change your database scheme you can create predicate with +predicateWithBlock method:

NSPredicate *predicate = [NSPredicate predicateWithBlock: ^BOOL(YourManagetObj* obj, NSDictionary *bind){
    NSDate* objDate = ... //convert string to date with the same date formatter you used to convert date to string
    return [objDate earlierDate:[NSDate date]] == objDate;
}];

Note also that with your scheme you'll have to use custom predicate that converts stored string to NSDate for sorting your objects by date.

Upvotes: 2

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