Socialcademy 4

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1

I am having trouble with using static on a function in my post repository its saying “Static methods may only be declared on a type Remove 'static '”. Also having trouble with the post view model when I use dot annotation fetchPosts() on PostsRepository it says “Type ‘PostsRepository’ has no member ‘fetchPosts’”. I have tried linking the two repository and view model together but wasn’t successful. Is this the solution for the type PostsRepository has no member fetchPosts? I don’t know about the static problem though. Kinda lost.

Post View Model Code

import Foundation

@MainActor
class PostsViewModel: ObservableObject {
    @Published var posts = [Post]()
    
    func makeCreateAction() -> NewPostForm.CreateAction {
        return { [weak self] post in
            try await PostsRepository.create(post)
            self?.posts.insert(post, at: 0)
        }
    }
    func fetchPosts() {
        Task {
            do {
                posts = try await PostsRepository.fetchPosts()
            } catch {
                print("[PostsViewModel] Cannot fetch posts: \(error)")
            }
        }
    }
    
}

PostRepository Code

import Foundation
import FirebaseFirestore
import FirebaseFirestoreSwift

let postsReference = Firestore.firestore().collection("posts")

static func fetchPosts() async throws -> [Post] {
    let snapshot = try await postsReference.order(by: "timestamp", descending: true).getDocuments()
    
    return snapshot.documents.compactMap { document in
        try! document.data(as: Post.self)
    }
}

struct PostsRepository {
    static let postsReference = Firestore.firestore().collection("posts")
    
    static func create(_ post: Post) async throws {
        let document = postsReference.document(post.id.uuidString)
        try await document.setData(from: post)
    }
}

private extension DocumentReference {
    func setData<T: Encodable>(from value: T) async throws {
        return try await withCheckedThrowingContinuation { continuation in
        // Method only throws if there's an encoding error, which indicates a problem with our model
        // We handled this with a force try, while all other errors are passed to the completion handler
            try! setData(from: value) { error in
                if let error = error {
                    continuation.resume(throwing: error)
                    return
                }
                continuation.resume()
            }
        }
    }
}
2

I thought I followed the guide word for word but for anyone else stuck on this, its because the static function isn’t in the struct “PostsRepository” fixed both errors.