New Follower/Following List

[MariaJsn]

Hi Sbertix,

Is there any way to get if there is any change in followers/following list since last fetch.

When I check the discussions I saw below item. But I could not understand how I can use this logic.
Please can you help me?

#118

Thanks,
Maria

[sbertix]

Hey @MariaJsn,

All you have to do is just cache the followers you get in the first request (using Realm, CoreData, UserDefaults, or whatever you're relying on) and compare them with the ones you get on refresh.

If you only care to know whether a change occurred or not, simply pass the same rank token in every refresh: only fetch 1 page, if you get a different next_id it means the list has changed.

[sbertix]

Not really @MariaJsn

The first time you'll have to do something like… 

let secret: Secret = /* some `Secret` */
// Assuming this is some sort of constant between
// launches, e.g. a string literal. 
let token = "some.constant.rank.token"
// Exhaust all your followers.
Endpoint.Friendship.following(secret.identifier, rank: token)
   .unlocking(with: secret)
   .task(
      maxLength: .max,
      onChange: {  output in
         // Do what you need to do with the actual output
         // then store the first (ONLY THE FIRST)
         // next max id.
         let nextIdentifier = output.pagination.next
      }
   )
   .resume()

Next time you need to check for changes just do…

// The old next identifier for the first page.
let firstPageNextIdentifier: String = /* some `String` */
// Fetch one page only.
Endpoint.Friendship.following(secret.identifier, rank: token)
   .unlocking(with: secret)
   .task(
      maxLength: 1,
      onChange: {  output in
         // If the next identifier is equal to the one you've cached
         // than you can assume no changes were made.
         guard output.pagination.next != firstPageNextIdentifier else { return }
         // Fetch all followers again. 
         // There's no way to actually return only updated ones.
      }
   )
   .resume()

This only works if token remains the same and it is passed as the rank argument.