i need to write my person model to realm db. i never understod what means because i'm using one instance of realm and i think i'm using the same thread.am i wrong ??
func updatePerson(ps:personTmp){
let db=fetchPerson()
guard let url=URL(string: "\(address)pe?Authorization=\(db.serverToken)") else {return}
var urlRequest=URLRequest(url: url)
urlRequest.httpMethod="PUT"
urlRequest.addValue("Application/Json", forHTTPHeaderField: "Content-type")
print(ps.dictionary)
let body = try! JSONSerialization.data(withJSONObject: ps.toJSON(), options: .prettyPrinted)
urlRequest.httpBody=body
URLSession.shared.dataTask(with: urlRequest) { (data, response, err) in
if let content=data {
let json = try! JSONSerialization.jsonObject(with: content, options: .allowFragments) as! [String:AnyObject]
let ersonJson = json["data"] as! AnyObject
let tmp = Mapper<person>().map(JSONObject: ersonJson)!
tmp.serverToken = db.serverToken
print(tmp)
self.dbManager.deleteAllFromDatabase()
if self.dbManager.saveData(ps: tmp) {
}
}
and this is my
class databaseManager {
var database:Realm
//var shareInstance=databaseManager()
static let share=databaseManager()
var config = Realm.Configuration()
init() {
config = Realm.Configuration(
// set a new version number, the version number must bigger than before
// if you never set it, it's 0
schemaVersion: 1,
migrationBlock: { migration, oldSchemaVersion in
if (oldSchemaVersion < 1) {
// do nothing
}
})
// tell Realm the new config should be used
Realm.Configuration.defaultConfiguration = config
// open realm file and it will do auto-migration
self.database = try! Realm()
}
func fetchData() -> person {
let nill=person()
DispatchQueue.global(qos: .background).async {
Realm.Configuration.defaultConfiguration = self.config
}
if let results = self.database.objects(person.self).first {
return results
}else {
return nill
}
}
func saveData(ps: person) ->Bool {
var bool:Bool?
try! self.database.write {
if (ps.serverToken.isEmpty || ps.identityId.isEmpty) {
bool=false
}else {
bool = true
self.database.add(ps, update: true)
}
}
return bool!
}
func deleteAllFromDatabase() {
DispatchQueue.main.async {
try! self.database.write {
self.database.deleteAll()
}
}
}
could you tell me what is wrong with my saving function ?? what would I do ? how can I write my model withOut thread conflicting ?
Using a Singleton does not mean that it will always be called on the same thread... for example..
// 1. here you are likely in the main thread
URLSession.shared.dataTask(with: urlRequest) { (data, response, err) in
// 2. here you are in a background thread
}
Your singleton (databaseManager) has likely been created on the main thread. When you are within a closure of an asynchronous function as in point 2 above, you are in a background thread. So if you create the objects in the background thread and then pass it to databaseManager to save, you are passing an object created on a background thread, to a realm instance that was created on the main thread. Causing your issue.
If I remember rightly, you should be able to dispatch to the main thread within the closure and get rid of this error:
DispatchQueue.main.async {
let json = try! JSONSerialization.jsonObject(with: content, options: .allowFragments) as! [String:AnyObject]
let ersonJson = json["data"] as! AnyObject
let tmp = Mapper<person>().map(JSONObject: ersonJson)!
tmp.serverToken = db.serverToken
self.dbManager.deleteAllFromDatabase()
if self.dbManager.saveData(ps: tmp) {
}
}