Turn emptyObject into computed property

Author: cbaker6

ParseSwift.playground/Pages/1 - Your first Object.xcplaygroundpage/Contents.swift

@@ -100,7 +100,7 @@ score.save { result in
             allows you to only send the updated keys to the
             parse server as opposed to the whole object.
         */
-        var changedScore = savedScore.emptyObject()
+        var changedScore = savedScore.emptyObject
         changedScore.score = 200
         changedScore.save { result in
             switch result {
@@ -192,7 +192,7 @@ assert(savedScore?.score == 10)
     allows you to only send the updated keys to the
     parse server as opposed to the whole object.
 */
-guard var changedScore = savedScore?.emptyObject() else {
+guard var changedScore = savedScore?.emptyObject else {
     fatalError()
 }
 changedScore.score = 200

ParseSwift.playground/Pages/15 - Custom ObjectId.xcplaygroundpage/Contents.swift

@@ -72,7 +72,7 @@ score.save { result in
             allows you to only send the updated keys to the
             parse server as opposed to the whole object.
         */
-        var changedScore = savedScore.emptyObject()
+        var changedScore = savedScore.emptyObject
         changedScore.score = 200
         changedScore.save { result in
             switch result {

ParseSwift.playground/Pages/4 - User - Continued.xcplaygroundpage/Contents.swift

@@ -106,7 +106,7 @@ User.login(username: "hello", password: "world") { result in
     Using `emptyObject` allows you to only send the updated keys to the
     parse server as opposed to the whole object.
 */
-var currentUser = User.current?.emptyObject()
+var currentUser = User.current?.emptyObject
 currentUser?.customKey = "myCustom"
 currentUser?.score = GameScore(score: 12)
 currentUser?.targetScore = GameScore(score: 100)
@@ -210,7 +210,7 @@ User.anonymous.login { result in
 }
 
 //: Convert the anonymous user to a real new user.
-var currentUser2 = User.current?.emptyObject()
+var currentUser2 = User.current?.emptyObject
 currentUser2?.username = "bye"
 currentUser2?.password = "world"
 currentUser2?.signup { result in

ParseSwift.playground/Pages/6 - Installation.xcplaygroundpage/Contents.swift

@@ -61,7 +61,7 @@ currentInstallation?.save { results in
     send the updated keys to the parse server as opposed to the
     whole object.
  */
-currentInstallation = currentInstallation?.emptyObject()
+currentInstallation = currentInstallation?.emptyObject
 currentInstallation?.customKey = "updatedValue"
 currentInstallation?.save { results in
 

Sources/ParseSwift/Objects/ParseObject.swift

@@ -40,38 +40,37 @@ public protocol ParseObject: Objectable,
 }
 
 // MARK: Default Implementations
-extension ParseObject {
+public extension ParseObject {
+
+    /**
+     Gets an empty version of the respective object. This can be used when you only need to update a
+     a subset of the fields of an object as oppose to updating every field of an object.
+     - note: Using an empty object and updating a subset of the fields reduces the amount of data sent between
+     client and server when using `save` and `saveAll` to update objects.
+    */
+    var emptyObject: Self {
+        var object = Self()
+        object.objectId = objectId
+        object.createdAt = createdAt
+        return object
+    }
 
     /**
      Determines if two objects have the same objectId.
      - parameter as: Object to compare.
      - returns: Returns a `true` if the other object has the same `objectId` or `false` if unsuccessful.
     */
-    public func hasSameObjectId<T: ParseObject>(as other: T) -> Bool {
+    func hasSameObjectId<T: ParseObject>(as other: T) -> Bool {
         return other.className == className && other.objectId == objectId && objectId != nil
     }
 
     /**
      Gets a Pointer referencing this object.
      - returns: Pointer<Self>
     */
-    public func toPointer() throws -> Pointer<Self> {
+    func toPointer() throws -> Pointer<Self> {
         return try Pointer(self)
     }
-
-    /**
-     Gets an empty version of the respective object. This can be used when you only need to update a
-     a subset of the fields of an object as oppose to updating every field of an object.
-     - note: Using an empty object and updating a subset of the fields reduces the amount of data sent between
-     client and server when using `save` and `saveAll` to update objects.
-     - returns: Self
-    */
-    public func emptyObject() -> Self {
-        var object = Self()
-        object.objectId = objectId
-        object.createdAt = createdAt
-        return object
-    }
 }
 
 // MARK: Batch Support

Tests/ParseSwiftTests/ParseObjectTests.swift

@@ -244,7 +244,7 @@ class ParseObjectTests: XCTestCase { // swiftlint:disable:this type_body_length
         var score = GameScore(score: 19, name: "fire")
         score.objectId = "yolo"
         score.createdAt = Date()
-        let empty = score.emptyObject()
+        let empty = score.emptyObject
         XCTAssertTrue(score.hasSameObjectId(as: empty))
         XCTAssertEqual(score.createdAt, empty.createdAt)
     }
@@ -578,7 +578,7 @@ class ParseObjectTests: XCTestCase { // swiftlint:disable:this type_body_length
         score.createdAt = Date()
         score.updatedAt = score.createdAt
 
-        let command = try score.emptyObject().saveCommand()
+        let command = try score.emptyObject.saveCommand()
         XCTAssertNotNil(command)
         XCTAssertEqual(command.path.urlComponent, "/classes/\(className)/\(objectId)")
         XCTAssertEqual(command.method, API.Method.PUT)
@@ -597,7 +597,7 @@ class ParseObjectTests: XCTestCase { // swiftlint:disable:this type_body_length
         let decoded = try XCTUnwrap(String(data: encoded, encoding: .utf8))
         XCTAssertEqual(decoded, expected)
 
-        var empty = score.emptyObject()
+        var empty = score.emptyObject
         empty.player = "Jennifer"
         let command2 = try empty.saveCommand()
         guard let body2 = command2.body else {