Parse - Query after a specific row - ios

Question

How can I query after a specific row where the objectId is equal to a objectId I have stored?
This is my query code:
func queryStory(){
let query = PFQuery(className: "myClassStory")
query.whereKey("isPending", equalTo: false)
query.limit = 1000
query.orderByDescending("createdAt")
query.findObjectsInBackgroundWithBlock { (posts: [PFObject]?, error: NSError?) -> Void in
if (error == nil){
// Success fetching objects
for post in posts! {
if let imagefile = post["userFile"] as? PFFile {
self.userFile.append(post["userFile"] as! PFFile)
self.objID.append(post.objectId!)
self.createdAt.append(post.createdAt!)
}
}
print("Done!")
}
else{
print(error)
}
}
}
This is my Parse database class:
What I want, is to only query the items that was createdAt after the objectId: woaVSFn89t. How can I do this?

Answer 1

Try filtering the objects once you have found them:
query.findObjectsInBackgroundWithBlock { (posts: [PFObject]?, error: NSError?) -> Void in
if (error == nil){
// Success fetching objects
var thePostTime = NSDate()
for post in posts! {
if post.objectId == "The Object Id You Were Trying To Find" {
thePostTime = post.createdAt!
}
}
for post in posts! {
if post.createdAt!.isGreaterThan(thePostTime) == true {
if let imagefile = post["userFile"] as? PFFile {
self.userFile.append(post["userFile"] as! PFFile)
self.objID.append(post.objectId!)
self.createdAt.append(post.createdAt!)
}
}
}
print("Done!")
}
else{
print(error)
}
}
You will notice that I compared the dates using this: NSDate Comparison using Swift

Answer 2

Before the for-loop make a variable:
var havePassedObjectId = false
Then inside the for-loop check if the current post is equal to the object id you want:
if post.objectid == "woaVSFn89t" {
self.userFile.append(post["userFile"] as! PFFile)
//Continue appending to arrays where needed
havePassedObjectId = true
} else if havePassedObjectId == true {
self.userFile.append(post["userFile"] as! PFFile)
//Continue appending to arrays where needed
}
This will check if you have already passed the object and append all the objects after.