Lấy dữ liệu sắp xếp điều kiện ios

data = data!.sorted(byKeyPath: "date", ascending: false)

Cập nhật dữ liệu Realm in IOS

let workouts = realm.objects(WorkoutsCount.self).filter("date = %@", removeTodaysItem)

let realm = try! Realm()
if let workout = workouts.first {
    try! realm.write {
        workout.date = today
        workout.count = plusOne
    }
}

Giới hạn kết quả Realm in IOS

let dogs = try! Realm().objects(Dog.self)
for i in 0..<5 {
  let dog = dogs[i]
  // ...
}




Chạy dòng for cập nhật data Realm in IOS

try! realm.write {
  for person in realm.objects(Person.self).filter("age == 10") {
    person.age += 1
  }
}

Tự động cập nhật kết quả

let puppies = realm.objects(Dog.self).filter("age < 2")
puppies.count // => 0
try! realm.write {
  realm.create(Dog.self, value: ["name": "Fido", "age": 1])
}
puppies.count // => 1

Nối các truy vấn điều kiện in IOS

let tanDogs = realm.objects(Dog.self).filter("color = 'tan'")
let tanDogsWithBNames = tanDogs.filter("name BEGINSWITH 'B'")

Sắp xếp Realm in IOS

// Sort tan dogs with names starting with "B" by name
let sortedDogs = realm.objects(Dog.self).filter("color = 'tan' AND name BEGINSWITH 'B'").sorted(byKeyPath: "name")

class Person: Object {
  dynamic var name = ""
  dynamic var dog: Dog?
}
class Dog: Object {
  dynamic var name = ""
  dynamic var age = 0
}

let dogOwners = realm.objects(Person.self)
let ownersByDogAge = dogOwners.sorted(byKeyPath: "dog.age")

Truy vấn Realm in IOS

// Query using a predicate string
var tanDogs = realm.objects(Dog.self).filter("color = 'tan' AND name BEGINSWITH 'B'")

// Query using an NSPredicate
let predicate = NSPredicate(format: "color = %@ AND name BEGINSWITH %@", "tan", "B")
tanDogs = realm.objects(Dog.self).filter(predicate)

Xóa 1 đối tượng trong Realm in IOS

try! realm.write {
  realm.delete(cheeseBook)
}

// Delete all objects from the realm
try! realm.write {
  realm.deleteAll()
}




Tạo class trong Realm in IOS

class Duck: Object {
  dynamic var animal: Animal? = nil
  dynamic var name = ""
}

Cách tạo đối tượng mới trong Realm

var myDog = Dog()
myDog.name = "Rex"
myDog.age = 10

// (2) Create a Dog object from a dictionary
let myOtherDog = Dog(value: ["name" : "Pluto", "age": 3])

// (3) Create a Dog object from an array
let myThirdDog = Dog(value: ["Fido", 5])