CODEWITHSUNDEEP
iosswiftparse-platformrelationship
Echizzle
Echizzle

Reputation: 3459

Parse relations in Swift

I'm in the process of making an app which creates events. The Event has a property user which saves successfully, but now I want to save an array of events to the current user. Each time an event is created I'm trying to add that event to an array (for key "Events" in the user class).

What's the best way to go about that in swift? Here's some sample code of where I save the event to parse.

The first gets the image file and passes it to the function to save the whole event...

   @IBAction func saveEvent(sender: AnyObject) {

    let pictureData = UIImagePNGRepresentation(eventImage.image)

    let file = PFFile(name: "eventImage", data: pictureData)

    file.saveInBackgroundWithBlock { (succeeded, error) -> Void in

        if !(error != nil) {
            self.saveEventToParse(file)
        }

        else if let error = error {
            println("error: \(error.localizedDescription)")
        }

    }


}

This function saves the event

func saveEventToParse(file: PFFile) {

    let event = Event(image: file, user: PFUser.currentUser()!, comment: eventDescriptionField.text, title: eventTitleField.text, date: datePicker.date)

    event.saveInBackgroundWithBlock { (success, error) -> Void in
        if success {

            //I KNOW I NEED TO DO SOMETHING HERE THAT'S NOT THIS

            event.user.relationForKey("Events")


            var alertView = UIAlertView(title: "Event saved!", message: "Success", delegate: nil, cancelButtonTitle: "Okay!")
            alertView.show()
        }
        else {
            println("error: \(error?.localizedDescription)")
        }

    }
}

Thank you!

Upvotes: 0

Views: 724

Answers (2)

jesses.co.tt
jesses.co.tt

Reputation: 2729

I think - in your particular case - that Relations are not the right choice. Actually, you really shouldn't be creating this on the User class, but instead making a Pointer to the User class on the Events class... it will be much faster (you would need to fetch the User everytime you wanted this anyways).

You would then query like this:

        let query = PFQuery(className: "Events")
        query.whereKey("userPointer", equalTo: PFUser.currentUser()!)
        query.findObjectsInBackgroundWithBlock { (objects, error) -> Void in
            if(error == nil) {
                print(objects)
            }
        }

Upvotes: 0

Xuan-Gieng Nguyen
Xuan-Gieng Nguyen

Reputation: 846

in Parse, relation is usually used for "many-to-many" relationship.

In your case, I'm not sure that the statement which is "one event can belong to many user" is right or wrong. However, you can continue by using the relation like this:

let relation = event.user.relationForKey("Events")
relation.addObject(event)
event.user.saveInBackground()

More information you can refer here: https://parse.com/docs/ios/guide#relations-using-parse-relations

Upvotes: 1

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