Kingdom Equality Testing

Question

I am trying to verify equality among objects Realmin unit tests. However, I cannot get objects to return truefor their equality.

According to the Realm docs here , I have to do this:

let expectedUser = User()
expectedUser.email = "[e-mail]"
XCTAssertEqual(testRealm.objects(User.self).first!,
               expectedUser,
               "User was not properly updated from server.")

However, I get the following test failure with the following code:

Kingdom Model

class Blurb: Object {
    dynamic var text = ""
}

Test

func testRealmEquality() {
    let a = Blurb()
    a.text = "asdf"
    let b = Blurb()
    b.text = "asdf"
    XCTAssertEqual(a, b)
}

Failed to execute XCTAssertEqual: ("Optional (Blurb {
    text = asdf;
})") is not equal to ("Optional (Blurb {
    text = asdf;
})")

Answer 1

. Realm Equatable :

BOOL RLMObjectBaseAreEqual(RLMObjectBase *o1, RLMObjectBase *o2) {
    // if not the correct types throw
    if ((o1 && ![o1 isKindOfClass:RLMObjectBase.class]) || (o2 && ![o2 isKindOfClass:RLMObjectBase.class])) {
        @throw RLMException(@"Can only compare objects of class RLMObjectBase");
    }
    // if identical object (or both are nil)
    if (o1 == o2) {
        return YES;
    }
    // if one is nil
    if (o1 == nil || o2 == nil) {
        return NO;
    }
    // if not in realm or differing realms
    if (o1->_realm == nil || o1->_realm != o2->_realm) {
        return NO;
    }
    // if either are detached
    if (!o1->_row.is_attached() || !o2->_row.is_attached()) {
        return NO;
    }
    // if table and index are the same
    return o1->_row.get_table() == o2->_row.get_table()
        && o1->_row.get_index() == o2->_row.get_index();
}

, ) , , Equatable. ) , () , . c) - , , ther .

"" , Realm.

a b . a b ( Realm), .

let a = Blurb()
a.text = "asdf"
let b = Blurb()
b.text = "asdf"
XCTAssertEqual(a.text, b.text)

, Realm . Realm ( "b" ). , , , .

, , :

let a = Blurb()
a.text = "asdf"

let realm = try! Realm()
try! realm.write {
    realm.add(a)
}

let b = realm.objects(Blurb.self).first!
print(a == b) // true

Answer 2

, iOS?

, http://nshipster.com/swift-comparison-protocols/

,

let a = NSObject()
let b = NSObject()
let c = a
a == b // false
a == c // true

, , Equatable

class MyClass: Equatable {
  let myProperty: String

  init(s: String) {
    myProperty = s
  }
}

func ==(lhs: MyClass, rhs: MyClass) -> Bool {
  return lhs.myProperty == rhs.myProperty
}

let myClass1 = MyClass(s: "Hello")
let myClass2 = MyClass(s: "Hello")
myClass1 == myClass2 // true
myClass1 != myClass2 // false
myClass1 === myClass2 // false
myClass1 !== myClass2 // true

.text

func testRealmEquality() {
    let a = Blurb()
    a.text = "asdf"
    let b = Blurb()
    b.text = "asdf"
    XCTAssertEqual(a.text, b.text)
}