How to retrieve a specific Column From Parse with swift?

Question

I have a Array column in my parse Class called "serviceHistory". Its in JSON format. I am having trouble querying just this column for all my parse objects(pool Accounts).

With This code i can print out each object, but i am having trouble accessing just the service History column.

var query = PFQuery(className:"PoolAccount")
query.selectKeys(["serviceHistory"])
query.findObjectsInBackgroundWithBlock { (objects, error) -> Void in

  if let objects = objects as? [PFObject] {

    self.serviceHistory = objects
    print("these are the selectedKeys \(objects)")

   //THIS PRINTS THE WHOLE OBJECT, AND NOT JUST THE SELECTED KEY."serviceHistory"

I am looking to print out just the service History and can't find the right query to do it...Its an array of JSONS for Each Object.

this is what I'm looking for it to print out..Each Pfobject has an array of JSONs attached to it. So i think i possibly need an array of arrays to put it in? [[PFObject]]? thanks in advance.

Wain · Accepted Answer · 2015-09-02 06:57:34Z

1

The query will always return an array of PFObject, you can't limit to a single column only. You can post process the objects to extract an array containing only that column content for each object:

... = objects.valueForKey("selectedKeys")

answered Sep 2, 2015 at 6:57

Wain

119k15 gold badges132 silver badges152 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Steve DeRienzo Over a year ago

I tried this(maybe the wrong way) but "valueForKey" is only working for 1 PFObject and not all the pfobjects in the array...how do i get all the pfobjects array of JSON into one array?

Steve DeRienzo · Accepted Answer · 2015-09-03 02:43:14Z

0

Figured it out..I used a for Loop and looped through each object and then used valueForKey and appended all the numbers to an array.

    for object in objects {

      if let dataObject:AnyObject = object.valueForKey("serviceHistory") {
      let thisJson = JSON(dataObject)

      for (_, entry) in thisJson {

        if let freeChlorineJson = entry["freeChlorine"].string {

          self.freeChlorine.append(freeChlorineJson)
          print(self.freeChlorine)
        }

answered Sep 3, 2015 at 2:43

Steve DeRienzo

2373 silver badges12 bronze badges

Collectives™ on Stack Overflow

How to retrieve a specific Column From Parse with swift?

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related