I have class User.swift:
import UIKit
#objc(User)
class User: DBObject {
dynamic var Sync: NSNumber?
dynamic var Login: NSString?
dynamic var Password: NSString?
dynamic var id_Worker: NSNumber?
static func authorize(login: String, password: String) -> Bool{
var query = User.query().whereWithFormat("login = %# and password = %#", withParameters: [login, password.md5])
var resSet = query.fetch() as DBResultSet
if resSet.count > 0 {
var user = resSet[0] as! User
}
if resSet.count > 0{
return true
} else {
return false
}
}
}
I want to retrieve User object from DBResultSet. But under the debbuger I get this strange construction:
How can I retrieve object User from DBResultSet?
Related
I'm working in swift 4.0, i have model object in MutableArray,
NSPredicate not working.
//Here is code
//Model class:
class Modelclass: NSObject
{
var firstName:String!
var lastName:String!
}
// Viewcontroller doing predicate:
let ary = NSMutableArray()
let userModel = Modelclass()
userModel.firstName = "Arrya"
userModel.lastName = "stark"
ary.add(userModel)
let commitPredicate = NSPredicate(format: "firstName == %#", "Arrya")
let resultAry = ary.filtered(using: commitPredicate)
print(resultAry)
I solved the problem,
Solution 1:
//I just added below code in model class
extension Modelclass {
#objc override func value(forKey key: String) -> Any? {
switch key {
case "firstName":
return firstName
case "lastName":
return lastName
default:
return nil
}
}
}
Solution 2:
Add #objc before variable:
class Modelclass: NSObject
{
#objc var firstName:String!
#objc var lastName:String!
}
var is introduced for Mutable Content/Variables
In swift you can use filter alternative to NSPredicate
Try Like this:
//Model class:
class Modelclass
{
var firstName: String
var lastName: String
init(firstName: String, lastName: String) {
self.firstName = firstName
self.lastName = lastName
}
}
// Viewcontroller doing predicate:
var ary:[Modelclass] = []
let userModel = Modelclass(firstName: "Arrya", lastName: "stark")
ary.append(userModel)
let resultAry = ary.filter{ $0.firstName == "Arrya" }
print(resultAry)
I was finalizing my social media application and I am consistently having the same error regarding the "username" of my user during the launch process of the application (app is running, user is logged in, and the next view controller fails to come up and it crashes giving EXC_BAD_INSTRUCTION).
I was thinking it might be adata base problem as I had that with the the profile picture, however, the user name is in the database registered as a user with its email and password.
The code of the section the error is in:
import Foundation
import Firebase
import FirebaseDatabase
class Post {
private var _username: String!
private var _userImg: String!
private var _postImg: String!
private var _likes: Int!
private var _postKey: String!
private var _postRef: DatabaseReference!
var username: String
{
return _username
}
var userImg: String
{
return _userImg
}
var postImg: String {
get {
return _postImg
} set {
_postImg = newValue
}
}
var likes: Int {
return _likes
}
var postKey: String {
return _postKey
}
init(imgURl: String, likes: Int, username: String, userImg: String) {
_likes = likes
_postImg = imgURl
_username = username
_userImg = userImg
}
init(postKey: String, postData: Dictionary<String, AnyObject>){
_postKey = postKey
if let username = postData["username"] as? String {
_username = username
}
if let userImg = postData["userImg"] as? String {
_userImg = userImg
}
if let postImg = postData["imageUrl"] as? String{
_postImg = postImg
}
if let likes = postData["likes"] as? Int {
_likes = likes
}
_postRef = Database.database().reference().child("posts").child(_postKey)
}
func adjustLikes(addLikes: Bool) {
if addLikes {
_likes = likes + 1
} else {
_likes = likes - 1
}
_postRef.child("likes").setValue(_likes)
}
}
the line where the error occurs:
return _username
I am just really puzzled what the issue could be. I have looked at all the IBOutlets, as well as removing and adding new users. I would appreciate any help.
In the init(postKey:postData:) constructor it's not guaranteed that the _username property will be set. However, the public username property is of a non-optional type String. My assumption is that the username getter tries to forcefully unwrap a nil value.
Your username variable is a computed read only property which is returning value from variable _username:String!(Forced unwrapped value means can not be nil else crash ) .You need to be sure that your variable is not nil.
example when _username is not nil-:
class Foo{
var _username:String = "tushar"
var username: String
{
return _username
}
}
var object = Foo()
print(object.username)
Example when your variable can get nil value-:
class Foo{
var _username:String!
var username: String
{
print(_username)
return _username
}
}
var object = Foo()
print(object.username)
If variable has no value in it that's a crash
I'm trying to save my array of objects in Realm, but Realm appears to be saving only the last object.
This is my model class:
class ContactEntry: Entry {
dynamic var contactId: Int = 0
dynamic var email: String? = ""
dynamic var phone: String? = ""
dynamic var building: String? = ""
dynamic var room: String? = ""
dynamic var contactDescription: String? = ""
dynamic var worktime: String? = ""
dynamic var address: String? = ""
dynamic var personEntries: PersonEntry?
}
This is the base class:
class Entry: Object {
dynamic var id: Int = 0
override static func primaryKey() -> String? { return "id" }
}
This is code I'm using for saving:
func createOrUpdate(entities: [Entity]) {
let entries = toEntries(entities)
let realm = try! Realm()
try! realm.write {
realm.add(entries, update: true)
}
}
func toEntry(entity: Contact) -> ContactEntry {
let entry = ContactEntry()
entry.contactId = entity.id
entry.email = entity.email
entry.phone = entity.phone
entry.building = entity.building
entry.room = entity.room
entry.contactDescription = entity.description
entry.worktime = entity.worktime
entry.address = entity.address
entry.personEntries = personDAO.toEntry(entity.person)
return entry
}
func toEntry(entity: Person) -> PersonEntry {
let entry = PersonEntry()
entry.personId = entity.id
entry.firstname = entity.firstname
entry.middlename = entity.middlename
entry.lastname = entity.lastname
entry.photo = entity.photo
return entry
}
I think that it may be because I have relationship in my model, but I'm not sure why they'd be a problem.
I'm using them as described in the Realm documentation.
I have this classes:
class FacebookDB: Object {
dynamic var userName: String = ""
dynamic var profilePicture: String = ""
}
class TwitterDB: Object {
dynamic var userName: String = ""
dynamic var profilePicture: String = ""
}
class UserDB: Object {
dynamic var id = 0
override class func primaryKey() -> String {
return "id"
}
dynamic var userName: String = ""
dynamic var firstName: String = ""
dynamic var lastName: String = ""
dynamic var email: String = ""
dynamic var facebookAccount = FacebookDB?()
dynamic var twitterAccount = TwitterDB?()
}
After I put a value inside the userName
//user value come from facebook
let testUser = UserDB()
let realm = try! Realm()
testUser.FacebookAccount?.userName = user.userName
print(user.userName)
print(testUser.FacebookAccount?.userName)
Here is the output:
vivieng
nil
Why can't I print testUser.FacebookAccount?.userName?
BTW I can access every value from UserDB but none of FacebookDB nor TwitterDB, any idea?
Finally I found how to deal with this.
I need to create a value like that:
let facebookAccount = FacebookDB()
And then put everything I want inside:
facebookAccount.userName = user.userName
And finally copy the class inside the class:
testUser.FacebookAccount = facebookAccount
And voilà, that's work now!
I'm using Xcode 6.4 and Swift in iOS 8.4 project
I have a model with one to many relationship
class Account: NSManagedObject {
#NSManaged var userId: Int
#NSManaged var accessToken: String?
#NSManaged var userName: String
#NSManaged var sex: String
#NSManaged var email: String
#NSManaged var avatarUrl: String?
#NSManaged var friends: NSSet
}
class User: NSManagedObject {
#NSManaged var id: Int
#NSManaged var userName: String
#NSManaged var sex: String
#NSManaged var email: String
#NSManaged var avatarUrl: String
}
When I'm trying to remove all friends it doesn't work:
extension Account {
func replaceFriends(friends:[User]) {
var friendsList = self.mutableSetValueForKey("friends")
friendsList.removeAllObjects()
friendsList.addObjectsFromArray(friends)
}
func getFriends() -> [User] {
return self.mutableSetValueForKey("friends").allObjects as! [User]
}
}
class AccountDao: BaseDao {
private class func findAccount() -> Account? {
if let result = moc.executeFetchRequest(NSFetchRequest(entityName: "Account"), error: nil) as? [Account] {
if (!result.isEmpty) {
return result[0]
}
}
return nil
}
class func getAccount() -> Account {
return findAccount() ??
NSEntityDescription.insertNewObjectForEntityForName("Account", inManagedObjectContext: moc) as! Account;
}
}
During saving I'm setting empty array:
class func saveObjectContext() -> Bool {
var error: NSError?
var account = AccountDao.getAccount()
account.replaceFriends([User]())
if !moc.save(&error) {
self.log.error("Error during saving context, \(error)")
return false
} else {
println("Count in log \(AccountDao.getAccount().getFriends().count)")
self.log.info("Info save context \(error)")
return true
}
}
In log it returns 0:
Count in log 0
But in ControllerView still I'm getting AccountDao.getAccount().getFriends().count == 1. Method replaceFriends works only first time when I fetch and save data. And it save changes for simple properties like userName but not for friends. Do you have any ideas?
I found that in relation one to many Account -> User without inverse relationship in User, after changing list in Account every user in list have to be marked that has changed (property updated == true). But it always was set to false.
I added additional property to User, and after every change of list I had to change this property like user.toUpdate = true. After this change everything is working fine.