Parse: Updating array

Question

I'm trying to upload an array with the following code, but I am getting an error on the second to last line which says Cannot assign to value: function call returns immutable array

for object in objects! {
  let newstring = NSString(format: ".0f", self.slider.value)
  var newarray = [object.objectForKey("times")]
  newarray.append(newstring)
  object.objectForKey("times") = newarray
  object.saveInBackground()
}

"times" is of type array in parse by the way.

Wain · Accepted Answer · 2015-11-19 23:13:28Z

1

Rather than requesting the array and trying to set it you should be using setObject:forKey: to replace the existing value.

object.setObject(newarray, forKey: "times")

answered Nov 19, 2015 at 23:13

Wain

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2 Comments

somepers Over a year ago

Oh ok, so just replace the second to last line with that

NSGangster Over a year ago

Just to clarify why you got the error object.objectForKey("times") is a function call that returns the value at key "times", being an immutable array. You then tried to assign a value to that immutable array. Which even if the array was mutable would not update the value of the array in the dictionary. This is why you need to use setObject() like this answer gives.

Jacob · Accepted Answer · 2015-11-20 02:40:50Z

0

May I suggest using the addObject:forKey: method instead?

for object in objects! {
  let newstring = NSString(format: ".0f", self.slider.value)
  object.addObject(newstring, forKey: "times")
  object.saveInBackground()
}

It is much cleaner and doesn't require retrieval :)

answered Nov 20, 2015 at 2:40

Jacob

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