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I have a user model that also handles saving info about that user to my database (Firestore). When a user updates their info, I need it to save to Firestore but I also need the model to update. I am not sure how to handle this and am currently getting a 'Closure cannot implicitly capture a mutating self parameter'.

Should I create a separate handler class, or how do I go about this?

Model:

struct User 
 var displayName: String?
 var lastLoggedInAt: Int?
 var createdAt: Int?
 private(set) var questionsLeft: Int?
 var currency: Int?

 var dictionary: [String: Any]

 init(dictionary: [String: Any]) 
 self.displayName = dictionary["displayName"] as? String
 self.lastLoggedInAt = dictionary["lastLoggedInAt"] as? Int
 self.createdAt = dictionary["createdAt"] as? Int
 self.questionsLeft = dictionary["questionsLeft"] as? Int
 self.currency = dictionary["currency"] as? Int

 self.dictionary = dictionary
 

 mutating func setQuestionsLeft(to num: Int) 
 questionsLeft = num
 dictionary["questionsLeft"] = num
 


// MARK: Set Firestore User Data
extension User 
 mutating func set(data: Data, then handler: Handler = nil) 
 guard let uid = Auth.auth().currentUser?.uid else return 

 let firestore = Firestore.firestore()
 let ref = firestore.collection("users").document(uid)

 ref.setData(data, merge: true) (error) in
 if let error = error 
 handler?(.failure(error))
 
 // update current user struct
 // get an error
 let keys = data.keys
 for key in keys 
 self.dictionary[key] = data[key]
 
 self = User(dictionary: self.dictionary)
 handler?(.success("Successfully Set User Data"))