Filtering objects from parse.com based on date

Question

I a retriving data from parse using a PFQuery, like this

var downloadQuery = PFQuery(class: "MyDatabase") 

 downloadQuery.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in

//retriving data her
                }

But is there a way that I can filter out objects created more than a week ago, or something like that?

I have used downloadQuery.whereKey("price", equalTo: "Free") to filter out certain objects but I can't figure out how to filter out objects based on the dates when they were created

kRiZ · Accepted Answer · 2016-02-24 23:44:57Z

1

You can use Parse's greaterThan, lessThan, greaterThanOrEqualTo, lessThanOrEqualTo with a date to filter your query.

Eg:

var downloadQuery = PFQuery(class: "MyDatabase") 
downloadQuery.whereKey("createdAt", lessThanOrEqualTo: lastWeek)

lastWeek is a date object which you can calculate using @yesthisisjoe's answer above. This will only fetch objects created within a week from the current day so no extra filtering will be required on your app side.

answered Feb 24, 2016 at 23:44

kRiZ

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yesthisisjoe · Accepted Answer · 2016-02-24 22:03:38Z

1

You can start by using downloadQuery.orderByDescending("createdAt") to sort the results by the date they were created.

Then you can do something like:

let calendar = NSCalendar.currentCalendar()
let lastWeek = calendar.dateByAddingUnit(.Week, value: -1, toDate: NSDate(), options: [])

for object in objects {
    if object.createdAt!.timeIntervalSinceDate(lastWeek).isSignMinus {
        //it's older than a week, so stop iterating through objects
        break
    }
    //it's within the past week, do something with the object
}

edited Feb 24, 2016 at 22:03

answered Feb 24, 2016 at 21:56

yesthisisjoe

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