Save the pointer value in parse.com with iOS Swift

Question

I want to add an id to a pointer field in Parse. I have 2 classes categories and Ads. In the categories class, the objectId is a String that I am using to get all the fields of the Ads class. In the Ads class, the cat field is a pointer to categories. Now I add the cat id with another column that is a String. The String field is added but the pointer column 'cat' is not added.

Here is the code:

let ex = "s8HiwfvKtQ"
let posts = PFObject(className: "Ads")
posts.setObject(ex, forKey: "cat")

or alternatively

posts["cat"] = ex 
posts.saveInBackground()

I tried the above code and found other solutions but still cannot save the cat field.

Below is a screenshot of the categories and Ads classes:

Error in console is:

invalid type for key cat, expected *categories, but got string (Code: 111, Version: 1.10.0)

Hamza Ansari · Accepted Answer · 2015-12-28 08:03:46Z

2

It is throwing error because cat is a category object and you are setting object as String you must set an object for cat row.

you must do something like:

 let ex = PFObject(className: "categories")
        ex.objectId = "s8HiwfvKtQ"

        let posts = PFObject(className: "Ads")
        posts.setObject(ex, forKey: "cat")

        posts.saveInBackgroundWithBlock { (success, error) -> Void in
            if let error = error{
                print(error.localizedDescription)
            }else{
                print(success)
            }
        }

answered Dec 28, 2015 at 8:03

Hamza Ansari

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5 Comments

Tushar Over a year ago

I try above code but again error in console is :"object not found for update (Code: 101, Version: 1.10.0)"

Hamza Ansari Over a year ago

have you checked objectId. Does s8HiwfvKtQ exist in categories

Tushar Over a year ago

yes ,now i change the objectId that is exit in categoories then error in console is:"Attempted to change an objectId to one that's already known to the OfflineStore."

Hamza Ansari Over a year ago

object id must be an id of category not Ads i think u are using an id which exist in Ads

Tushar Over a year ago

ya but the objectId of category column and cat of Ads column both are same.ObjectId of category is use in Ads class as pointer field

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