Merge pull request #1059 from r-plus/fix/optional_rawrepresentable_en…

…um_for_immutablemappable

Fix: Could not map to optional RawRepresentable enum for ImmutableMappable

Sources/ImmutableMappable.swift

@@ -84,11 +84,21 @@ public extension Map {
 		return try self.value(key, nested: nested, delimiter: delimiter, using: EnumTransform(), file: file, function: function, line: line)
 	}
 
+	/// Returns a RawRepresentable type or throws an error.
+	func value<T: RawRepresentable>(_ key: String, nested: Bool? = nil, delimiter: String = ".", file: StaticString = #file, function: StaticString = #function, line: UInt = #line) throws -> T? {
+		return try self.value(key, nested: nested, delimiter: delimiter, using: EnumTransform(), file: file, function: function, line: line)
+	}
+
 	/// Returns a `[RawRepresentable]` type or throws an error.
 	func value<T: RawRepresentable>(_ key: String, nested: Bool? = nil, delimiter: String = ".", file: StaticString = #file, function: StaticString = #function, line: UInt = #line) throws -> [T] {
 		return try self.value(key, nested: nested, delimiter: delimiter, using: EnumTransform(), file: file, function: function, line: line)
 	}
 
+	/// Returns a `[RawRepresentable]` type or throws an error.
+	func value<T: RawRepresentable>(_ key: String, nested: Bool? = nil, delimiter: String = ".", file: StaticString = #file, function: StaticString = #function, line: UInt = #line) throws -> [T]? {
+		return try self.value(key, nested: nested, delimiter: delimiter, using: EnumTransform(), file: file, function: function, line: line)
+	}
+
 	// MARK: BaseMappable
 
 	/// Returns a `BaseMappable` object or throws an error.

Tests/ObjectMapperTests/ImmutableTests.swift

@@ -339,21 +339,28 @@ class ImmutableObjectTests: XCTestCase {
 			}
 		}
 
+		enum RawRepresentableEnum: String {
+			case world
+		}
 		struct Object: ImmutableMappable {
 			let immutable: ImmutableObject?
+			let enumValue: RawRepresentableEnum?
 			init(map: Map) throws {
 				self.immutable = try map.value("immutable")
+				self.enumValue = try map.value("enum")
 			}
 		}
 
 		let json: [String: Any] = [
 			"immutable": [
 				"value": "Hello"
-			]
+			],
+			"enum": "world"
 		]
 		do {
 			let object = try Mapper<Object>().map(JSON: json)
 			XCTAssertEqual(object.immutable?.value, "Hello")
+			XCTAssertEqual(object.enumValue, .world)
 		} catch {
 			XCTFail()
 		}