FirebaseFirestoreSwift를 사용해보기

struct User: Codable, Equatable {
    var name: String
}

import FirebaseFirestore
import FirebaseFirestoreSwift

...

func set() {
    let user: User = User(name: "tsubasa")

    let db: Firestore                = Firestore.firestore()
    let encodedUser: [String : Any]  = try! Firestore.Encoder().encode(user)
    db.collection("users").document("hoge").setData(encodedUser)
}

func get() {
    let db: Firestore             = Firestore.firestore()
    let docRef: DocumentReference = db.collection("users").document("hoge")
    docRef.getDocument { (document, _) in
        if let document = document, document.exists {
            let user = try? Firestore.Decoder().decode(User.self, from: document.data()!)
            // あとは煮るなり焼くなり
        } else {
            print("Document does not exist")
        }
    }
}