How to store retrieved data to the another class in Parse - ios

Question

I've a small problem. I am working on an App using Parse backend. So my problem is:
i've retrieved all the objectIds of users in _User class like this:
var userIds = [String]()
var userQuery = PFUser.query()
userQuery?.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
if let users = objects {
self.userIds.removeAll(keepCapacity: true)
for object in users {
if let user = object as? PFUser {
if user.objectId != PFUser.currentUser()?.objectId {
self.userIds.append(user.objectId!)
}
}
}
}
println(userIds)
})
Now i want to save all the userIds which are stored in the array "userIds" to a column in a class named "Something". so the code will be like:
var something:PFObject = PFObject(className: "Something")
something["users"] = // have problem here
something.saveInBackground()
if i put userIds here, it gives an error.. because userIds is an array but column "users" is String.. but also i want to save all the userIds seperately in the column "users" like it is saved in objectId column of _User class..

Answer 1

I'm new here and I can't comment in the reply where you asked for help. Anyway, what do you want now is save only new users, as you said:
I just want to save the users which are not there
Well, there are some suggestions:
You can retrieve your User class and check for new users manually in the app and then send the new ones to your Class.
You can create a new column in your User class like "saved" where contains a boolean indicating if you already saved this user to your custom class or not. Remember also, of always do
user["saved"] = false
while creating a new user and then simply do:
let search = PFQuery(className: "_User")
search.whereKey("saved", equalTo: false)
to get these non saved users.
I strongly recommend the second option.

Answer 2

Ok, the case that you describe should look something like this:
var userIds = [String]()
var userQuery = PFUser.query()
userQuery?.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
if let users = objects as? [PFUser] {
var somethingObjects = [PFObject]()
self.userIds.removeAll(keepCapacity: true)
for user in users {
if user.objectId != PFUser.currentUser()?.objectId {
self.userIds.append(user.objectId!) // I don't know if this is necessary anymore for your usecase
var something:PFObject = PFObject(className: "Something")
something["users"] = user.objectId
somethingObjects.append(something)
}
}
PFObject.saveAllInBackground(somethingObjects)
}
})
In this case, you create a number of something objects that are saved, but you might want to rename the "users" column to "user", since you only save one objectId per row.
I haven't worked with parse in a while, so there might be a way to optimize the number of API calls you have to make.