How to reset and toggle API credentials - ios

Question

I have an app that can save multiple accounts to access my server API and retrieve data. Each account has its own credentials so the data pulled from server changes depending on which account is selected.
When my app runs first time, my API class checks my CoreData model to see which account is active and uses that account's credentials throughout the app. I can select a different account and set it as active and unset/inactivate all other accounts in my Accounts tableView and reset the Credentials object with the new selected account, but when I do my app still uses the account that the app first started with.
How do I structure my class to use the account's credentials that I select in my Accounts tableView? Below is my API class I use. This class is called when my app starts.
class API {
init(){
self.credentials = getActiveStore()
// I then use self.credentials to make API calls.
// Rest of the code is omitted for brevity
}
func getActiveStore() -> Credentials?{
let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
let managedContext = appDelegate.managedObjectContext!
let fetchRequest = NSFetchRequest(entityName: "User")
fetchRequest.returnsObjectsAsFaults = false
fetchRequest.predicate = NSPredicate(format: "active = %#", 1 as NSNumber) //NSPredicate(format: "active == YES", argumentArray: nil)
var error:NSError?
let fetchResults = managedContext.executeFetchRequest(fetchRequest, error: &error) as! [WooStore]
if fetchResults.count == 1 {
let name = fetchResults[0].name
let url = fetchResults[0].url
let username = fetchResults[0].username
let password = fetchResults[0].password
return Credentials(name: name, url: url, username: username, password: password)
}
return nil
}
}

Answer 1

I would just use the NSManagedObject that is returned as your credentials object. There is no reason to create a new object that is just a copy of the NSManagedObject.
Subclass NSManagedObject, add any convenience methods that you want to the subclass and return it.
Update
My User is an NSManagedObject class which doesn't have an initializer
All objects have an initializer. Even NSManagedObject.
However, you don't need to initialize the object because it is already initialized and populated! It is sitting in your fetchResults array.
if let cred = fetchResults.lastObject {
return cred
} else {
return nil
}
Instead of referencing the first object in the array over and over again just to construct some other object.
Update
and I still don't see the effect I want to have. The data still belongs to previous user after I selected different account.
Based on your code, you determine the active user based on a boolean flag in the persistent store. While this is not a good idea, lets roll with it.
To change the user, you would need to set the current user's flag to 0. Then you need to fetch the soon to be active user and set their flag to 1. Then save the context so that the changes are persisted in the store. Then this code will do what you expect it to do.
You would do all of that wherever in your app you are switching users. NOT in the code you have provided here.